Forelimb Lameness: What the Research Says

Evidence from 77 peer-reviewed studies

1 Systematic Review

8 RCT

28 Cohort Study

27 Case Report

13 Expert Opinion

What Professionals Should Know

•Genetic screening and marker-assisted selection can help reduce prevalence of radiological navicular changes in breeding populations
•Performance and navicular health are not genetically opposed—horses can be selected for both sound limbs and competitive ability simultaneously
•Early radiographic screening of young horses combined with genomic testing offers practical tools to identify at-risk individuals before clinical lameness develops
•Dorsal-to-palmar neuroanastomosis should not be routinely performed as a complication-prevention measure during PDN, as it does not reduce neuroma formation or improve outcomes
•Standard palmar digital neurectomy remains the appropriate technique; surgeons should focus on surgical technique refinement rather than adding anastomosis procedures
•Clients should be counseled that neuroma formation risk persists with PDN regardless of neuroanastomosis, and long-term follow-up remains necessary
•Lidocaine with epinephrine is an effective substitute for mepivacaine in median and ulnar nerve blocks when mepivacaine is unavailable
•Both local anesthetics produce similar clinical outcomes and duration (150+ minutes), supporting either choice based on availability
•Response timing is slightly faster with lidocaine/epinephrine (5 vs 9.6 minutes), but both are clinically acceptable for lameness evaluation
•Liposomal bupivacaine offers a clinically meaningful advantage for nerve blocks in lame horses, providing pain relief for a full day versus only 1 hour with standard bupivacaine—valuable for diagnostic anesthesia and therapeutic pain management
•Consider liposomal bupivacaine for palmar nerve blocks when extended analgesia is needed, though cost-benefit and drug availability should be evaluated against standard formulations
•This experimental finding warrants clinical validation in field cases before changing current anesthetic protocols
•Low doses of xylazine or acepromazine can be safely used during lameness examinations for up to 1 hour without masking moderate forelimb lameness signs
•These sedatives improve horse compliance during evaluation without artificially improving or worsening observed lameness grades, supporting their routine clinical use
•Local analgesia will reduce apparent lameness, so intra-articular or regional blocks must be withheld until after baseline lameness assessment if diagnostic blocking is not the intended outcome
•Proper therapeutic shoeing combined with intra-articular anti-inflammatory injection provides substantial lameness improvement in navicular cases; tiludronate IVRLP does not meaningfully enhance these established treatments in the short-to-medium term.
•If considering tiludronate IVRLP as adjunctive therapy, high-dose protocols (0.2 mg/kg) may offer marginal advantage over low-dose or placebo by 120 days, though clinical significance of this finding is unclear.
•Focus your navicular management on optimizing farrier work and DIPJ injection protocols rather than expecting additional benefit from regional perfusion techniques.
•When performing diagnostic median nerve blocks during lameness examinations, clinicians should not expect improvement in gait if pain originates from the cubital joint, despite the anatomical proximity of the nerve to the joint
•A failed response to median nerve blocking can help localize pain to the cubital joint rather than structures distal to the block site
•The standard 10 mL volume of 2% mepivacaine used for median nerve blocks is insufficient to anesthetize the cubital joint itself
•Clodronate appears clinically effective for improving forelimb lameness in navicular syndrome cases, with improvements noted within 1 week and sustained performance gains by 8 weeks
•The improvement in lameness occurs without measurable effects on bone remodeling, suggesting clodronate's clinical benefit may involve mechanisms other than direct effects on bone turnover
•Further research is needed on multiple-dose protocols, as this study examined only single-dose effects and bisphosphonates have long half-lives that may produce cumulative effects
•Low-dose xylazine sedation can safely be used during diagnostic analgesia for hindlimb lameness assessment without concern for masking lameness signs
•For forelimb lameness evaluation, be aware that xylazine may reduce apparent lameness amplitude in mildly affected horses, potentially leading to underestimation of subtle forelimb pathology
•Inertial sensor measurements provide objective lameness data even when sedation is employed, but clinical interpretation must account for lameness severity and limb location
•IMU-based gait analysis can quantify clinically relevant lameness thresholds for head movement asymmetry; use 11.5–12.5 mm as reference range for straight-line trotting and 24.5–26.5 mm for circular work
•Withers movement data correlates strongly with head movement in lame horses, suggesting dual-sensor systems may enhance lameness detection reliability in field conditions
•Surface type and work pattern (straight vs. circle) significantly affect threshold values, so diagnostic interpretation should account for working conditions during assessment
•A simple accelerometer mounted on the bridle during lunge work provides objective quantification of headshaking severity, helping differentiate true TGMHS from other causes of head movement abnormalities
•This non-invasive technology could improve diagnosis accuracy and allow objective monitoring of whether management strategies (dietary modifications, exercise changes) are reducing headshaking severity
•The method distinguishes TGMHS from lameness-related head movement compensations, potentially avoiding misdiagnosis and inappropriate treatment of lame horses
•For horses with suspected navicular disease, combine ultrasonography and bursography as a practical alternative when standing MRI is unavailable or unaffordable, particularly for detecting DDFT pathology
•Be aware that no single imaging modality reliably detects adhesions or fibrocartilage defects; if these are clinically suspected, consider bursoscopy as the only definitive diagnostic tool
•MRI excels at identifying dorsal fibrillations and DDFT splits, making it valuable when available, but ultrasonography alone has significant limitations and requires careful interpretation
•Forelimb lameness is significantly more common than hindlimb lameness in this Brazilian population; prioritize distal forelimb structures (foot, pastern, fetlock) in diagnostic workup
•Impact lameness dominates the presentation pattern—focus on landing asymmetry and structures involved in impact absorption when planning diagnostic blocks and imaging
•Most lame horses present with moderate-to-severe intensity and mixed primary/secondary patterns; expect multi-limb involvement rather than isolated single-limb cases in your examination protocols
•Lameness detection at walk can be objectively measured using breakover duration symmetry via hoof-mounted gyroscopes—the lame limb shows significantly prolonged breakover compared to its pair
•Horses compensate for lameness through ipsilateral and diagonal limb adjustments while maintaining symmetry in non-affected contralateral pairs, suggesting a specific biomechanical strategy
•Breakover duration asymmetry between contralateral limbs could become a useful diagnostic tool for detecting subtle lameness where traditional visual assessment may be inconclusive
•ESWT shows clinical benefit for SDFT and PSD with improved lameness scores, but ultrasound lesions may not fully resolve—manage expectations regarding tissue healing on imaging
•Treatment frequency (≥3 vs <3 sessions) did not significantly affect outcomes; focus on adequate follow-up time and patient recovery rather than number of sessions
•Chronic injuries respond less favorably to ESWT; earlier intervention may improve prognosis
•Use withers movement asymmetry alongside head nod patterns to differentiate primary forelimb from primary hindlimb lameness—if head and withers indicate different forelimbs, suspect hindlimb lameness
•In horses with large compensatory head nods, withers motion capture can improve diagnostic accuracy by revealing the true location of primary lameness
•Motion capture metrics provide objective quantification that can catch subtle compensatory patterns and improve diagnostic confidence during lameness investigations
•Facial expression assessment alone is insufficient for detecting mild lameness in pre-race trot-ups and should not replace objective lameness detection methods like the Equinosis Lameness Locator
•If using facial expressions clinically, exposed sclera may be the most reliable indicator of orthopaedic pain, but this finding alone is too weak to guide decision-making
•Continue relying on objective gait analysis and physical examination parameters rather than subjective facial expression scoring for identifying pre-clinical musculoskeletal injury in racehorses
•Use head motion asymmetry measurements when assessing suspected inside forelimb lameness on circles, and withers motion for outside forelimb lameness—these show superior diagnostic reliability
•Objective gait analysis tools with established asymmetry thresholds can now support visual lameness assessment during circle work, reducing subjective interpretation errors
•Circular trotting creates physiological asymmetries that must be distinguished from lameness-related asymmetries; use these validated thresholds as diagnostic cutoffs in your practice
•3-year-old Quarter Horses are at significantly higher risk for forelimb lameness when entering training compared to 2-year-olds; consider age-appropriate training progression and closer monitoring for older juveniles
•Narrow feet, short toe length, and reduced wall height are hoof morphology markers associated with forelimb lameness in young horses entering training; farriers should identify these features early and potentially modify shoeing and hoof care strategies
•Longer heels in lame hindlimbs suggest hoof imbalance may be a contributor to lameness; routine hoof balance assessment and corrective trimming may help reduce subclinical lameness incidence
•Objective gait analysis using motion capture can help distinguish subtle lameness from normal asymmetry in prepurchase examinations, improving confidence in clinical decision-making
•Combinations of multiple kinematic parameters are more discriminatory than single measurements; focus on head/poll/pelvis and hip movements for detecting low-grade lameness
•Clinical experience and subjective assessment have limitations in detecting subtle lameness—objective data supports prepurchase examination reliability
•Use withers upward amplitude asymmetry thresholds (±7-10%) as objective criteria to confirm or refute suspected forelimb lameness identified on clinical examination
•Apply pelvis-based asymmetry thresholds for hindlimb lameness detection, recognizing different threshold ranges are needed for left versus right limb involvement
•IMU-based gait analysis systems with these validated thresholds can standardize lameness interpretation and improve diagnostic consistency across practitioners
•Kinetic gait analysis showing reduced peak vertical force and delayed peak vertical force timing may help identify DDF tendinopathy in lame horses, though these changes may not be unique to this condition
•Different MRI presentations of DDF tendinopathy (dorsal border, core, splits) were identified; understanding these patterns may guide prognosis and treatment decisions
•Ground reaction force measurements could potentially differentiate DDF tendinopathy from other forelimb pathologies in future diagnostic protocols
•When performing diagnostic anesthesia, evaluate horses on both hard and soft surfaces as movement changes manifest differently depending on limb location and surface type
•Monitor withers movement specifically as distinct asymmetry patterns between forelimb and hindlimb lameness can support diagnostic confidence and reduce expectation bias
•Interpret compensatory movement patterns (head, withers, pelvis) in relation to the primarily affected region to confirm anesthetic response and support clinical decision-making
•Observe crooked tail carriage as a clinical indicator of lameness—lame horses are 8.6 times more likely to show CTC than sound horses
•CTC is particularly associated with hindlimb lameness, sacroiliac joint pain, and thoracolumbar muscle tension; use it as a screening sign to focus your examination on the hindquarters and back
•Tail position alone does not indicate which limb is lame, so do not rely on tail deviation to lateralise lameness—complete lameness evaluation is still essential
•Do not rely solely on BMIS straight-line trotting results for final lameness diagnosis; use them as a screening tool to guide which diagnostic modalities to pursue next
•Be aware that BMIS significantly over-identifies combined lameness patterns (56.6% vs 10.9% confirmed), meaning many horses flagged as 'combined lame' will have single-limb or non-limb-related issues on full workup
•Trust BMIS most when it shows no lameness (92% confirmation rate) or single-limb lameness patterns consistent with diagonal or sagittal compensatory movement; be most skeptical of combined lameness classifications
•Do not assume a head nod on one side indicates forelimb lameness on that side—it may be compensatory movement from hindlimb pain on the opposite side
•Incorporate withers movement assessment alongside traditional head and pelvic movement evaluation to improve diagnostic accuracy
•Understanding compensatory movement patterns is essential to avoid misdiagnosis and inappropriate treatment of the wrong limb
•Assessment of both head and withers movement patterns together provides better prediction of hindlimb versus forelimb lameness than head movement alone in Thoroughbreds
•The timing and direction relationship between head and withers displacement can help clinicians identify whether a gait asymmetry involves ipsilateral or contralateral limb compensation
•Inertial sensor technology enables objective measurement of these subtle movement patterns for more accurate lameness localization during clinical trot-ups
•Don't rely solely on straight-line trotting to clear horses of lameness—always include lungeing assessment on both hard and soft surfaces, as subtle forelimb lameness may only become apparent during circular work.
•When lungeing lame horses, expect greater asymmetry when the affected forelimb is on the inside of the circle on hard ground; use this position strategically during clinical examination.
•Head movement symmetry is a more sensitive indicator of forelimb lameness during lungeing than pelvic movement; focus observation on head nodding rather than hip hike assessment when evaluating on the lunge.
•PRP response varies considerably between individual horses with OA — lack of response to joint anesthesia does not predict PRP failure, and vice versa
•Higher platelet concentrations in PRP do not guarantee better clinical outcomes for lameness in OA joints
•Kinetic gait analysis may help objectively measure response to intra-articular therapies, but radiographic OA severity alone cannot predict which horses will benefit from PRP
•Saddle slip should be investigated as a potential indicator of hindlimb or concurrent forelimb lameness rather than assuming only saddle fit or rider issues are responsible
•When addressing saddle slip, clinically assess the horse's gait (particularly in canter) and hindlimb function alongside evaluating saddle fit and rider alignment
•Many lame horses in the general sports population go unrecognized; saddle slip may be an important clinical sign prompting lameness investigation
•Persistent one-sided saddle slip in a horse should prompt investigation for hindlimb lameness, particularly as a diagnostic indicator when other causes have been excluded
•Resolution of saddle slip following treatment of hindlimb lameness confirms the lameness as the primary causative factor and validates the therapeutic approach
•Saddle slip direction may help localize the lamer hindlimb, aiding clinical assessment and diagnostic focus
•Distal border fragments on MRI are part of navicular disease pathology and associate with other bone abnormalities, but their individual role in causing lameness cannot yet be determined from imaging alone
•MRI grading of total navicular changes may be more diagnostically useful than fragment presence in isolation when evaluating chronic foot lameness
•Further research is needed to establish whether managing distal border fragments specifically will improve clinical outcomes
•Palmar foot pain involves multiple structures beyond the navicular bone alone—assess DSIL, navicular bursa, and DDFT as part of a functional unit in lame horses
•Not all navicular bone changes correlate with lameness; focal medullary lesions dorsal to FFC lesions appear most clinically relevant
•Adaptive changes occur in navicular apparatuses of all horses; identifying which lesions cause pain and dysfunction should guide targeted treatment rather than treating all structural changes identically
•DDFT pathology is commonly present alongside navicular bone lesions in lame horses; diagnostic imaging should assess both structures systematically
•Dorsal DDFT changes appear more significant than palmar changes in chronic palmar foot pain, which may inform therapeutic targeting
•Early intervention addressing vascular and matrix integrity of the DDFT may potentially prevent or slow progression of navicular disease pathology
•Always evaluate mild lameness in both ridden and in-hand conditions, as rider presence can mask or exacerbate signs that may not be apparent in one context alone
•When lameness appears worsened under saddle, try an alternative rider with different training level before concluding the horse has clinically significant lameness
•Individual horses respond unpredictably to different riders, so lameness assessments must account for this variability rather than relying on a single ridden evaluation
•Reduced stride variability in a lame horse indicates the animal has adopted an optimized compensatory gait pattern; this consistency should not be misinterpreted as soundness
•Relief of lameness (via anaesthesia, therapy, or farriery work) will initially increase gait variability as the pain-avoidance constraint is removed and normal movement patterns resume
•Monitoring stride consistency during lameness evaluation and treatment can help assess whether pain relief is effective—expect initial increase in stride variability as a positive sign of reduced pain
•99mTc-MDP scintigraphy is a useful diagnostic tool for confirming navicular bone involvement in horses with palmar foot pain; consider imaging at 1 hour post-injection rather than waiting longer
•Always obtain palmar view images as they are more diagnostic than lateral views alone for navicular area evaluation
•This imaging modality helps differentiate navicular syndrome from other causes of forelimb lameness after palmar digital nerve blocks isolate pain to the foot
•Cell-based therapies for intrasynovial DDFT lesions appear promising, with fibrocartilage-zone cells showing distinct chondrogenic potential suited to the mechanical demands of the intrasynovial space
•Future therapeutic strategies should consider the zonal origin of harvested cells, as fibrocartilaginous and tendinous regions have different differentiation capacities that may influence repair outcomes
•This foundational research suggests targeted cell therapies—particularly those promoting chondrogenic differentiation—warrant further clinical investigation for improving currently poor prognoses in intrasynovial tendon injuries
•When examining lame campdraft horses, expect distal forelimb pathology more frequently than in other equine disciplines; prioritize thorough distal limb assessment
•Diagnostic anaesthesia combined with radiography is often sufficient for diagnosis (41% of cases); reserve ultrasonography for cases where imaging remains inconclusive
•Bilateral forelimb lameness occurs in 13% of campdraft horses, suggesting the sport's demands may impose symmetrical loading stresses—evaluate both forelimbs even if one appears clinically worse
•Expect approximately two-thirds of horses with ALDDFT injuries to return to work; baseline lameness status and imaging findings are important prognostic indicators
•Adhesion formation on ultrasound is a significant negative prognostic indicator—monitor imaging carefully and consider more aggressive intervention if adhesions develop
•Controlled exercise appears to be a reasonable first-line approach for many cases, but persistent lameness warrants consideration of advanced treatments or reassessment of rehabilitation strategy
•Arthroscopy is a viable, safe treatment option for horses with osteochondral fragments in the cervical spine causing lameness or reduced neck mobility
•Surgeons should be aware that some cases may require a second procedure to fully resolve the condition
•Expect good long-term outcomes with horses returning to functional use, though limited sample size warrants caution in generalizing results
•When performing palmar digital nerve blocks as a diagnostic aid, monitor for unexpected increases in head bob or lameness signs, as this paradoxical response occurs in some horses and may indicate complex pain patterns or compensation mechanisms
•Head height asymmetry measurements should be carefully interpreted after nerve blocks—improvement is expected, but deterioration requires reassessment of the underlying diagnosis and treatment plan
•This finding highlights the importance of objective gait analysis (such as head height measurements) in lameness evaluation, as subjective visual assessment alone may miss these unexpected responses to diagnostic blocks
•Consider bilateral hindlimb SDFT injury in sports horses presenting with bilateral hindlimb swelling and lameness after strenuous exercise, even though this location is uncommon
•Ultrasound examination is essential to confirm suspected tendon injury and assess lesion extent before treatment planning
•BMAC injection combined with structured rehabilitation may be an effective treatment option for SDFT injuries, though long-term outcomes require further evidence from larger studies
•When diagnosing foot lameness, perform DIPJ and navicular bursa blocks and evaluate responses at 2 and 5 minutes—early timing is critical for accurate pain localization
•If lameness improves immediately and consistently after navicular bursa analgesia, suspect navicular bursa pathology; if improvement develops gradually over 10 minutes, suspect DIPJ involvement
•Perineural nerve blocks alone should not be relied upon to differentiate between DIPJ and navicular bursa pain—proceed to intra-synovial analgesia for definitive localization
•This minimally invasive technique offers a potential alternative to traditional open surgery for cervical nerve compression in lame horses, with promising short-term outcomes and faster recovery
•Currently this procedure should be considered experimental; more clinical cases and formal comparisons with conventional approaches are needed before widespread adoption
•Horses with caudal cervical lameness refractory to conservative management may be candidates for referral to centres offering this technique, pending further research validation
•Pose estimation technology offers a non-invasive alternative to subjective lameness assessment, potentially reducing observer bias in gait evaluation
•Current method is more reliable for detecting forelimb lameness; hindlimb lameness detection still needs refinement before clinical application
•Simple setup with easily detectable anatomical landmarks suggests future potential for widespread practical use, though this is preliminary work requiring validation on larger populations
•Ultrasound-guided cervical nerve root injection is now a technically viable treatment option for equine cervical radiculopathy, with high accuracy and low complication rates when performed under general anesthesia
•Direct injectate contact with nerve roots occurs ~75% of the time, with the remainder in close proximity; diffusion effects likely improve clinical efficacy beyond direct contact
•Risk of serious complications (intravascular or intraspinal injection) is low (<4%), but practitioners should remain cautious and maintain proficiency with ultrasound guidance and anatomical knowledge
•All therapy horses should undergo regular objective lameness assessment with modern technology (e.g., Lameness Locator®) before therapeutic use, as 90% in this study had detectable lameness
•Even mild lameness affects the biomechanical signals delivered to riders; select only sound or minimally lame horses for therapeutic work to maximize therapeutic benefit
•Establish a veterinary health monitoring protocol for therapy horses including objective gait analysis, as subjective clinical assessment alone misses significant lameness
•This device offers an objective, quantifiable method to detect and grade lameness severity, helping standardize assessments across different clinicians and reducing subjective variation
•The established cut-off values (80 impulses for detection, 85+ for mild lameness, 130+ for severe) provide practical diagnostic thresholds for field use
•As an affordable, portable tool requiring minimal training, this technology could improve diagnostic confidence for less experienced practitioners while supporting evidence-based decision-making in lameness cases
•When treating primary forelimb lameness, expect contralateral hindlimb compensatory movement patterns; addressing the primary forelimb issue will improve pelvic asymmetry metrics
•Hindlimb lameness creates ipsilateral forelimb compensation at trot; resolution of hindlimb pathology improves forelimb movement asymmetry without separate treatment
•Use inertial sensor technology to quantify and track asymmetry patterns before and after analgesia to distinguish true multiple limb involvement from compensation
•Intratendinous fibromas should be considered in the differential diagnosis of progressive forelimb lameness that fails to respond to conservative treatment, particularly when ultrasound shows an enlarging hypoechoic lesion within the SDFT
•Serial ultrasound imaging is valuable for monitoring lesion progression and identifying lack of response to rehabilitation, which may indicate need for alternative management decisions
•Poor prognosis cases with progressive necrosis/enlargement despite treatment warrant early consideration of euthanasia to prevent further compromise and suffering
•When foals present with acute severe forelimb lameness and imaging findings are inconclusive on radiographs and ultrasound, CT should be considered for definitive diagnosis of septic lesions in the proximal humerus
•CT imaging can guide targeted sampling from septic foci, allowing culture-directed antibiotic therapy rather than empirical treatment
•Apophyseal infections in young horses may show subtle radiographic signs initially; advanced imaging should not be delayed if clinical signs are severe
•Medial carpal collateral ligament injury may have better prognosis with appropriate management than previously documented in the literature.
•Consider combining box rest, controlled exercise, and high-intensity laser therapy as a treatment protocol for carpal collateral ligament injuries.
•Individual case outcomes should not be extrapolated; controlled trials are needed to determine if HILT provides additional benefit beyond conservative rehabilitation.
•Consider silicate-associated osteoporosis in the differential diagnosis for horses presenting with progressive back pain, lameness, and ataxia, particularly those with exposure to endemic silicate-rich regions
•Two years of silicate exposure may be sufficient to develop clinically significant bone disease; assess grazing and work environment history for potential silicate inhalation sources
•Widespread discrete osteolytic lesions on radiographs are not pathognomonic for neoplasia—environmental toxin exposure should be evaluated before pursuing aggressive diagnostic workup
•Bilateral bipartite navicular disease carries a guarded to poor prognosis for return to previous performance levels in athletic horses; MRI should be considered to fully assess concurrent soft tissue involvement
•Radiography alone may underestimate the extent of pathology in navicular disease; MRI provides critical additional diagnostic information about podotrochlear apparatus integrity
•When evaluating chronic forelimb lameness in performance horses, consider MRI imaging to identify occult soft tissue lesions that may explain poor response to conventional treatments
•Concurrent PSD and ALDDFT injury produces clinical signs nearly indistinguishable from isolated PSD, so comprehensive systematic ultrasound examination of the entire proximal metacarpal/metatarsal region is essential for accurate diagnosis
•Clinical palpation findings are often subtle—don't rely on obvious swelling or heat; use targeted diagnostic analgesia blocks and imaging to confirm diagnosis
•Ultrasound appearance of close apposition or adhesions between the suspensory ligament and ALDDFT may have prognostic implications and should be documented carefully
•Needle endoscopy is a viable diagnostic technique for investigating navicular bursa pathology in lame horses, with the direct approach offering better visualization of key anatomical structures
•Both direct and transthecal approaches are similarly efficient in terms of access time and attempt number, allowing choice based on clinical circumstances and operator preference
•Risk of significant iatrogenic damage from needle endoscopy is minimal with either approach, making this a relatively safe complementary diagnostic tool for navicular region lameness
•When lameness localizes to the proximal metacarpus/metatarsus region, ultrasound the entire proximal soft tissue area—don't assume single structure pathology; concurrent PSD and ALDDFT injuries are possible and may be bilateral
•Response to palmar metacarpal or proximoplantar nerve blocks confirms pain localization to this region and should prompt comprehensive ultrasonographic evaluation of all structures
•Recurrent lameness in horses treated for PSD may indicate missed concurrent ALDDFT pathology; thorough imaging at initial presentation is critical to avoid incomplete treatment
•When performing low palmar nerve blocks diagnostically, anaesthetise both the medial and lateral palmar nerves distal to the ramus communicans to avoid missing pain signals that cross via the communicating branch
•If blocking only one palmar nerve, consider depositing local anaesthetic adjacent to the ramus communicans itself to block cross-connecting sensory fibres and improve diagnostic accuracy
•Incomplete lameness resolution after a palmar nerve block proximal to the ramus communicans should prompt consideration of anaesthetising the communicating branch rather than assuming the block has failed
•Conservative management including stall rest, hoof stabilization with cast material, and heel elevation can be effective for distal phalanx fractures in forelimbs.
•Progressive rehabilitation with gradual return to work and transition from therapeutic shoeing to standard shoes is feasible over a 6-month period.
•Radiographic images may underestimate healing; advanced imaging (MRI) or histology may be needed to confirm fracture consolidation.
•Consider proximal ALDDFT injury as a differential diagnosis for forelimb or hindlimb lameness even when no obvious swelling or palpable abnormalities are present—use diagnostic analgesia and ultrasonography to confirm
•Hindlimb ALDDFT injuries may be more obvious clinically (oedematous swelling in proximoplantaromedial metatarsal region) compared to forelimb injuries, which are more subtle
•Prognosis is guarded; only 1 of 4 forelimbs returned to full function, and hindlimb cases have significant recurrence risk despite conservative management
•Arthroscopic debridement provides good short-term relief (85% initially sound) but guarded long-term prognosis; only ~46% remain fully sound at 4 years
•Examine the contralateral foot carefully during pre-operative assessment, as over half these horses had significant changes in the non-affected joint
•Consider early debridement as an intervention to optimize outcomes, but counsel clients realistically about recurrence risk and long-term soundness expectations
•Conservative management with stall confinement and phytotherapeutic supplementation may be considered as an alternative to surgical arthrodesis in selected carpal OA cases, though outcomes are unpredictable
•Development of swelling on the contralateral limb warrants investigation even when the opposite side was initially clinically normal
•Spontaneous ankylosis can result in functional recovery without surgical intervention, though this outcome cannot be guaranteed
•Consider MR imaging when lameness is localized to a specific anatomic region by diagnostic anesthesia but conventional imaging (radiography, ultrasonography) fails to identify a cause
•Soft tissue masses within synovial structures like the digital flexor tendon sheath may be invisible on radiographs and ultrasound but readily apparent on MR imaging
•Tenoscopic treatment of digital flexor tendon sheath lesions, combined with appropriate post-operative management including intra-synovial therapy, can return performance horses to competition
•Palmar foot pain is highly prevalent in polo ponies with forelimb lameness (30% confirmed by nerve block), warranting targeted foot pain assessment in your polo and sport horse populations
•Hoof tester and percussion testing are sensitive diagnostic indicators (83% positive) and can be valuable screening tools in your lameness workup before proceeding to nerve blocks
•Consider palmar foot pain in the differential diagnosis of forelimb lameness in polo and sport horses, as it represents a significant portion of cases and may require specific management strategies
•SDFT lesions in the carpal canal present with characteristic acute unilateral lameness worse on flexion—consider this diagnosis in older horses with these signs
•Ultrasound assessment should include longitudinal views to detect loss of fiber architecture; compare cross-sectional area between limbs as a key diagnostic marker
•Prognosis is guarded but not hopeless (60% return to work); however, pre-existing back-at-the-knee conformation suggests a poorer outcome—discuss realistic expectations with owners
•Proximal suspensory desmitis should be included in your differential diagnosis list for any lame horse, particularly those with obscure forelimb or hindlimb lameness
•Diagnostic imaging including ultrasound and nuclear scintigraphy can help confirm the condition and guide treatment planning
•Treatment approaches range from conservative management to advanced therapies, allowing tailoring to individual cases and performance goals
•Visual assessment alone cannot reliably detect mild lameness or hindlimb lameness in horses, regardless of your experience level—use objective diagnostic tools when lameness is suspected
•High confidence in your visual assessment does not correlate with accuracy; remain skeptical of subtle lameness diagnoses made purely by observation
•Hindlimb lameness is particularly difficult to detect visually and is frequently overdiagnosed (false positives); seek additional diagnostic confirmation before treatment decisions
•Inertial sensors can objectify lameness assessment by measuring head nod and hip hike with greater precision than visual evaluation, supporting more consistent clinical decisions
•Lungeing and flexion tests produce predictable gait changes; understand these adaptations to avoid misinterpreting sensor data as pathological movement
•Sensor accuracy of 3-7 mm is clinically meaningful and below human visual detection limits, making these tools valuable for tracking subtle changes and validating your clinical impression
•When treating forelimb lameness, expect and monitor for compensatory hindlimb dysfunction, particularly in the contralateral hindlimb—this may persist even after forelimb lameness resolves
•Assessment of pelvic and head movement asymmetry using inertial sensors can objectively quantify compensation patterns and help guide diagnostic anaesthesia interpretation
•Horses with forelimb-only lameness show different compensation patterns than those with concurrent forelimb-hindlimb lameness, requiring individualized treatment approaches
•The circumferential hoof clamp is a reliable and reversible experimental method for inducing controlled lameness in horses for research purposes
•Lameness induction is immediate and consistent with visual changes, but recovery takes several days even after clamp removal—relevant for research planning and animal welfare protocols
•This method provides both objective (force plate) and subjective (visual scoring) lameness confirmation, useful as a standardized research tool
•Do not rely solely on radiographs to diagnose or rule out navicular syndrome; advanced imaging (MRI/CT) may be necessary when clinical signs suggest navicular disease but radiographs are inconclusive
•Navicular syndrome diagnosis requires integration of history, physical examination, lameness evaluation, and diagnostic anesthesia alongside imaging—no single test is definitive
•Consider structures beyond the traditional navicular complex (bone, bursa, DDFT) when investigating chronic forelimb lameness, as newer imaging reveals additional pathologic involvement
•Single ESWT treatment shows no measurable immediate pain relief for navicular disease lameness—do not expect improved gait within 7 days post-treatment
•Current competition bans on pre-competition ESWT appear unjustified based on acute analgesic properties, though long-term benefits remain unproven
•Objective gait analysis (force plate assessment) should be used to evaluate ESWT efficacy rather than relying on subjective lameness grades alone
•Perform lameness evaluations 15 minutes to 1 hour after palmar digital nerve block to ensure complete analgesic effect before diagnostic interpretation
•Be aware that some analgesia persists beyond 2 hours, which may influence gait assessment timing in subsequent diagnostic blocks or procedures
•Plan re-blocking or follow-up procedures accordingly, as mepivacaine effect is substantially diminished by 2 hours but not completely absent
•Dressage and jumping horses presenting with restricted hindlimb impulsion, stiffness, and poor canter quality should be evaluated for sacroiliac joint pain using scintigraphy combined with clinical examination
•Young, tall Warmbloods in athletic disciplines warrant heightened suspicion for SI joint involvement; poor epaxial muscle development and hindquarter muscle asymmetry are important clinical markers
•Diagnostic anesthetic infiltration around the SI joint can confirm diagnosis definitively—a positive response predicts good treatment potential and helps distinguish SI pain from concurrent lameness in other regions
•When assessing forelimb lameness using head motion analysis, standardize the trotting speed for consistent and comparable results, especially in moderate lameness cases
•Mild lameness may not show speed-dependent changes, but moderate lameness will worsen at faster speeds—test at multiple speeds to fully evaluate severity
•Head motion asymmetry measurements can be normalized across different speeds using a two-speed protocol, improving diagnostic standardization in practice
•Radiographic normality does not exclude significant navicular bone or DDFT pathology—subclinical microscopic changes can be severe and warrant closer clinical monitoring and conservative management
•The deep flexor tendon surface is the likely primary site of damage in podotrochlosis; management strategies should prioritize reducing repetitive microtrauma to this structure
•Early detection and intervention targeting the tendon before navicular bone involvement occurs may alter progression and potentially preserve function

Key Research Findings

Radiological alterations in navicular bone occur in warmblood populations at frequencies between 14.9% and 87.6%

Diesterbeck, 2008

Heritability estimates for navicular disease range from h² = 0.09 to h² = 0.40, indicating genetic factors play an important role

Diesterbeck, 2008

Significant QTL for navicular pathology were identified on equine chromosomes 2, 3, 4, 10, and 26, with genome-wide significance on ECA2 and ECA10

Diesterbeck, 2008

Simultaneous selection for both reduced radiological changes and improved performance traits can achieve genetic improvement in both navicular health and competition success

Diesterbeck, 2008

Dorsal-to-palmar branch neuroanastomosis did not reduce neuroma formation following palmar digital neurectomy

Whisenant Katrijn D, 2024

Neuroanastomosis did not improve clinical outcome compared to standard PDN

Whisenant Katrijn D, 2024

Neuroma formation remains a significant complication despite surgical nerve reconnection techniques

Whisenant Katrijn D, 2024

Reduction in lameness vector sum did not differ between 2% lidocaine/epinephrine and 2% mepivacaine nerve blocks (P = 0.791)

Boorman Sophie, 2022

Mean time to clinically significant lameness reduction (<8.5 mm) was 5 minutes for lidocaine/epinephrine versus 9.6 minutes for mepivacaine

Boorman Sophie, 2022

Both treatments produced lameness reduction lasting 150 minutes in all responsive horses

Boorman Sophie, 2022

One horse with highest baseline lameness did not achieve clinically significant reduction with either treatment

Boorman Sophie, 2022

Liposomal bupivacaine (LB) provided significantly improved mechanical nociceptive thresholds, objective lameness, and peak vertical force for up to 24 hours post-injection

V. Moorman, 2022

Bupivacaine hydrochloride (BHCl) showed significant improvements only at 1 hour post-injection

V. Moorman, 2022

LB demonstrated 24-fold longer duration of analgesia compared to BHCl in perineural anesthesia of palmar nerves

V. Moorman, 2022

The sole-pressure lameness model required screw adjustment every 24 hours to maintain grade 3/5 lameness throughout the study period

V. Moorman, 2022

Evidence Base

Review of genetic aspects of radiological alterations in the navicular bone of the horse.

Diesterbeck, Distl (2008) — DTW. Deutsche tierarztliche Wochenschrift

Systematic Review

Dorsal-to-palmar branch neuroanastomosis in horses undergoing palmar digital neurectomy does not reduce neuroma formation or improve outcome.

Whisenant Katrijn D, Foucaud Mathieu, Mariën Tom et al. (2024) — Veterinary surgery : VS

RCT

Comparison of 2% mepivacaine and a solution of 2% lidocaine/epinephrine administered for median and ulnar nerve blocks in horses with naturally occurring forelimb lameness.

Boorman Sophie, DeGraves Fred, Schumacher John et al. (2022) — Veterinary surgery : VS

RCT

Liposomal bupivacaine provides longer duration analgesia than bupivacaine hydrochloride in an adjustable sole-pressure model of equine lameness.

V. Moorman, L. Pezzanite, G. Griffenhagen (2022) — American journal of veterinary research

RCT

Effects of acepromazine and xylazine on subjective and objective assessments of forelimb lameness.

Morgan Jessica M, Ross Michael W, Levine David G et al. (2020) — Equine veterinary journal

RCT

Quantitative assessment of intravenous regional limb perfusion of tiludronate as an adjunctive treatment for lameness caused by navicular syndrome in horses.

Schoonover, Whitfield, Young et al. (2019) — American journal of veterinary research

RCT

An Objective Assessment of the Effect of Anesthetizing the Median Nerve on Lameness Caused by Pain in the Cubital Joint.

McGlinchey Leah, Agne Gustavo, Passler Thomas et al. (2019) — Journal of equine veterinary science

RCT

Clodronate improves lameness in horses without changing bone turnover markers.

Mitchell A, Wright G, Sampson S N et al. (2019) — Equine veterinary journal

RCT

Effect of sedation on fore- and hindlimb lameness evaluation using body-mounted inertial sensors.

Rettig M J, Leelamankong P, Rungsri P et al. (2016) — Equine veterinary journal

RCT

Quantifying head and withers movement asymmetry in sound and naturally forelimb lame horses trotting on a circle on hard and soft surfaces.

Taddey Caroline M, Roecken Michael, Kreling Kai M et al. (2025) — Equine veterinary journal

Forelimb Lameness: What the Research Says

What Professionals Should Know

Key Research Findings

Evidence Base

Review of genetic aspects of radiological alterations in the navicular bone of the horse.

Dorsal-to-palmar branch neuroanastomosis in horses undergoing palmar digital neurectomy does not reduce neuroma formation or improve outcome.

Comparison of 2% mepivacaine and a solution of 2% lidocaine/epinephrine administered for median and ulnar nerve blocks in horses with naturally occurring forelimb lameness.

Liposomal bupivacaine provides longer duration analgesia than bupivacaine hydrochloride in an adjustable sole-pressure model of equine lameness.

Effects of acepromazine and xylazine on subjective and objective assessments of forelimb lameness.

Quantitative assessment of intravenous regional limb perfusion of tiludronate as an adjunctive treatment for lameness caused by navicular syndrome in horses.

An Objective Assessment of the Effect of Anesthetizing the Median Nerve on Lameness Caused by Pain in the Cubital Joint.

Clodronate improves lameness in horses without changing bone turnover markers.

Effect of sedation on fore- and hindlimb lameness evaluation using body-mounted inertial sensors.

Quantifying head and withers movement asymmetry in sound and naturally forelimb lame horses trotting on a circle on hard and soft surfaces.

Use of a poll-mounted accelerometer for quantification and characterisation of equine trigeminal-mediated headshaking.

Diagnostic performance of ultrasonography, bursography and standing magnetic resonance to detect navicular intrabursal pathology in horses with foot pain.

Objective lameness assessment of 235 horses undergoing lameness examination in Brazil: A retrospective study

Unilateral-Dominant Lameness Induces Changes in Breakover Duration Symmetry in Equine Walk

Electrohydraulic Shockwave for Treatment of Forelimb Superficial Digital Flexor Tendinitis and Proximal Suspensory Desmitis in Horses.

Withers vertical movement symmetry is useful for locating the primary lame limb in naturally occurring lameness.

Poor Association between Facial Expression and Mild Lameness in Thoroughbred Trot-Up Examinations.

Asymmetry Thresholds Reflecting the Visual Assessment of Forelimb Lameness on Circles on a Hard Surface.

Effect of age at training initiation on hoof morphology and lameness in juvenile American Quarter Horses.

Movement asymmetries in horses presented for prepurchase or lameness examination.

Investigation of Thresholds for Asymmetry Indices to Represent the Visual Assessment of Single Limb Lameness by Expert Veterinarians on Horses Trotting in a Straight Line.

Kinetic Analysis in Horses With Deep Digital Flexor Tendinopathy Within the Digit Diagnosed by Magnetic Resonance Imaging.

Changes in Head, Withers, and Pelvis Movement Asymmetry in Lame Horses as a Function of Diagnostic Anesthesia Outcome, Surface and Direction.

Crooked tail carriage in horses: Increased prevalence in lame horses and those with thoracolumbar epaxial muscle tension or sacroiliac joint region pain

Comparison of results for body-mounted inertial sensor assessment with final lameness determination in 1,224 equids.

Vertical movement symmetry of the withers in horses with induced forelimb and hindlimb lameness at trot.

Head, withers and pelvic movement asymmetry and their relative timing in trot in racing Thoroughbreds in training.

Lungeing on hard and soft surfaces: Movement symmetry of trotting horses considered sound by their owners.

Gait Changes Vary among Horses with Naturally Occurring Osteoarthritis Following Intra-articular Administration of Autologous Platelet-Rich Plasma.

The interrelationship of lameness, saddle slip and back shape in the general sports horse population.

An investigation of the relationship between hindlimb lameness and saddle slip.

High-field magnetic resonance imaging investigation of distal border fragments of the navicular bone in horses with foot pain.

Histopathology in horses with chronic palmar foot pain and age-matched controls. Part 1: Navicular bone and related structures.

Histopathology in horses with chronic palmar foot pain and age-matched controls. Part 2: The deep digital flexor tendon.

Influence of rider on lameness in trotting horses.

The influence of lameness on equine stride length consistency.

Scintigraphic evaluation of 99mTc-methylene diphosphonate uptake in the navicular area of horses with lameness isolated to the foot by anesthesia of the palmar digital nerves.

Zonal Characterization and Differential Trilineage Potentials of Equine Intrasynovial Deep Digital Flexor Tendon-Derived Cells

Prevalence of musculoskeletal injuries associated with lameness in Australian campdraft horses.

Desmitis of the accessory ligament of the deep digital flexor tendon in the forelimb: A retrospective case study of 91 horses.

Arthroscopic removal of osteochondral fragments of the cervical articular process joints in three horses.

Prevalence and clinical significance of increasing head height asymmetry as a measure of forelimb lameness in horses when trotting in a straight line after palmar digital nerve block.

Muscle Disorders of the Horse

Objective evaluation for analgesia of the distal interphalangeal joint, the navicular bursa and perineural analgesia in horses with naturally occurring forelimb lameness localised to the foot.

Percutaneous full endoscopic foraminotomy for treatment of cervical spinal nerve compression in horses using a uniportal approach: Feasibility study.

Artificial Intelligence for Lameness Detection in Horses-A Preliminary Study.

Ultrasound-guided injection technique of the equine cervical nerve roots.

Objective lameness assessment in horses used for equine-assisted therapy in Rio Grande do Sul State, Brazil

Development of a Novel Approach for Detection of Equine Lameness Based on Inertial Sensors: A Preliminary Study

Upper body movement analysis of multiple limb asymmetry in 367 clinically lame horses.

Intratendinous Fibroma of the Superficial Digital Flexor Tendon within the Carpal Sheath of a Horse.

Multimodal Diagnostic Imaging to Identify Septic Apophysitis of the Proximal Humerus in a Thoroughbred Foal.

Management of Primary Injuries of the Medial Collateral Ligament of the Carpus in Two Horses.

Multifocal discrete osteolysis in a horse with silicate associated osteoporosis.

Magnetic resonance and radiographic imaging of a case of bilateral bipartite navicular bones in a horse.

Concurrent proximal suspensory desmopathy and injury of the proximal aspect of the accessory ligament of the deep digital flexor tendon in forelimbs or hindlimbs in 19 horses

Diagnostic endoscopy of the navicular bursa using a needle endoscope by direct or transthecal approach: A comparative cadaver study.

Concurrent Proximal Suspensory Desmopathy And Injury of the Proximal Aspect of the Accessory Ligament of the Deep Digital Flexor Tendon in Forelimbs and Hindlimbs

Function of the ramus communicans of the medial and lateral palmar nerves of the horse.

Conservative management of a transverse fracture of the distal phalanx in a Quarter Horse.

Proximal injuries of the accessory ligament of the deep digital flexor tendon in forelimbs and hindlimbs: 12 horses (2006–2010)

Long-term outcome after arthroscopic debridement of distal phalanx extensor process fragmentation in 13 horses.

Spontaneous bilateral ankylosis of the carpometacarpal joint in a Paint Horse

Detection of an epidermoid cyst in the foot of a horse by use of magnetic resonance imaging.

Clinical study of palmar foot pain in 30 polo ponies with forelimb lameness in Thailand

A Case Series of Five Horses with Superficial Digital Flexor Tendon Lesions in the Carpal Canal.

An overview of proximal suspensory ligament desmitis

Reliability of equine visual lameness classification as a function of expertise, lameness severity and rater confidence.

Quantitative assessment of gait parameters in horses: Useful for aiding clinical decision making?

Naturally-occurring forelimb lameness in the horse results in significant compensatory load redistribution during trotting.

Circumferential hoof clamp method of lameness induction in the horse.

Navicular syndrome in equine patients anatomy, causes, and diagnosis.

Investigation of the immediate analgesic effects of extracorporeal shock wave therapy for treatment of navicular disease in horses.

Mepivacaine local anaesthetic duration in equine palmar digital nerve blocks.

Pain associated with the sacroiliac joint region: a clinical study of 74 horses.

Individual speed dependency of forelimb lameness in trotting horses.