Hindlimb Lameness: What the Research Says

Evidence from 71 peer-reviewed studies

1 RCT

28 Cohort Study

26 Case Report

16 Expert Opinion

What Professionals Should Know

•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
•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
•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
•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
•Most riding instructors and trainers cannot reliably detect hindlimb lameness in daily practice—structured training is needed to improve this critical skill
•Slow-motion video review (65% speed) combined with correct answer feedback is the most effective training method; simply telling people the right answer or adding verbal explanation is insufficient
•Even with training, hindlimb lameness detection remains difficult—lower threshold for referring horses to veterinary examination is warranted when lameness is suspected
•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
•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
•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
•Pelvic upward movement amplitude asymmetry measured via smartphone can help objectively detect lameness as an adjunct to visual assessment, with a practical threshold of ≥7.5 mm identifying lame horses with reasonable sensitivity
•This portable, low-cost technology could enable on-site objective lameness grading during clinical examinations to improve diagnostic consistency and support treatment decision-making
•The highest diagnostic accuracy with AbPDUp suggests focusing measurements on vertical movement asymmetry rather than minimum or maximum pelvis heights when using smartphone accelerometry for lameness screening
•Body-mounted inertial sensors are valuable supporting tools for lameness evaluation, particularly for detecting changes in lameness after treatment, even when veterinarian agreement is moderate
•Video-based lameness assessment is more challenging than live evaluation and may not accurately reflect clinical findings—prefer live examination when possible
•Use BMISS technology alongside clinical judgment rather than as a replacement, as objective measurement shows strongest utility in confirming improvement post-analgesia
•Inertial sensor measurements (Pmin/Pmax) can reliably detect hindlimb lameness caused by limb length differences, making this technology useful for objective lameness assessment in practice.
•Gait pattern (straight vs. circular) affects which lameness parameters are detectable—pushoff-phase asymmetries may be masked during lunging, so evaluate lame horses on both straight lines and circles.
•Even 10mm height differences create measurable lameness signatures; use this knowledge when assessing horses with subtle gait abnormalities or suspected uneven shoe wear.
•Assess hoof balance in the sagittal plane (PADP) as part of diagnostic workup for hindlimb lameness, particularly for distal tarsal and proximal metatarsal region problems
•Corrective farriery aimed at improving PADP may be beneficial as an adjunctive treatment for distal tarsal and proximal suspensory lameness, though causality not yet established
•Do not rely on hoof conformation assessment alone for suspected stifle lameness, as PADP does not appear to be a significant risk factor for this location
•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
•Objective pelvic movement measurement can reduce examiner bias when evaluating hindlimb lameness response to diagnostic analgesia
•Current inertial measurement technology offers potential to improve diagnostic accuracy, though standardized assessment protocols are still being developed
•Quantitative data may enhance confidence in diagnosis when subjective clinical assessment is equivocal
•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
•Neurectomy and fasciotomy for PSD works well (78% success) in horses with isolated suspensory disease, but consider conformation and concurrent injuries before recommending surgery
•Straight hock conformation or fetlock hyperextension are strong predictors of treatment failure—horses with these conformational features should not be considered good surgical candidates
•In cases with concurrent lameness problems, success rate drops to 44%; carefully select which horses will benefit from this procedure
•Do not assume a dorsoproximal MtIII spur is clinically significant in isolation—always correlate with other radiological findings and lameness diagnostics
•Osseous spurs appear more frequently in hocks with distal tarsal joint osteoarthritis, so they may serve as a radiological indicator of this pathology
•Intra-articular analgesia blocks of the distal tarsal joints should be used to confirm whether a spur is the source of lameness before committing to treatment
•Arthroscopic surgery for tarsocrural OCD produces significant lameness improvement (>80%) in most horses, justifying consideration as a treatment option
•Joint effusion may persist longer than clinical lameness improves; extended recovery periods allow better resolution of swelling
•Older horses may have better functional outcomes with this procedure despite age concerns, though individual variation should guide case selection
•Early conditioning exercise during foal development does not compromise subsequent racing careers and may offer protective benefits against early-onset musculoskeletal problems
•Racehorses subjected to early track-based conditioning do not require less training to reach competitive fitness, so early conditioning decisions should be based on skeletal maturation and long-term durability rather than efficiency gains
•Pasture-only reared racehorses may be at increased risk of developing joint pain and lameness issues earlier in their racing career; early conditioning may help prepare skeletal tissues for training demands
•Decreased COMP in synovial fluid indicates cartilage loss in established tarsometatarsal OA, but single measurements cannot stage disease progression
•The specific COMP fragment (30 kDa) may offer potential for earlier clinical detection of OA if assay development is pursued, potentially enabling intervention before radiographic changes become apparent
•Hyaluronan measurement alone is not a useful synovial fluid biomarker for monitoring tarsometatarsal OA in horses
•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
•Nuclear scintigraphy can support clinical diagnosis of sacroiliac joint disease but should never be used in isolation; always correlate imaging findings with clinical signs and other diagnostic tests
•Asymmetrical radiopharmaceutical uptake and abnormal L5-to-SI joint ratios are suggestive of SI joint involvement, particularly when marked left-right differences are present
•Remember that lameness from other causes can produce similar scintigraphic findings, so SI joint disease diagnosis requires a multi-modal approach combining imaging, palpation, and response to diagnostic anesthesia
•Genetic factors (sire) appear more influential than training methods for tarsal lameness in Icelandic horses—select breeding stock carefully rather than attributing problems solely to rider/trainer management
•Early age at breaking to saddle increases lameness risk; consider delaying training start and monitor horses with poor tarsal angles more closely
•Show participation is a risk factor; manage workload and competition schedules for genetically predisposed individuals to reduce lameness incidence
•Expect radiographic evidence of distal tarsal DJD in approximately one-third of Icelandic riding horses; prevalence increases substantially with age
•Clinical lameness from distal tarsal DJD is often subtle and may only become apparent during or after flexion testing—use this diagnostic test routinely in suspect cases
•Radiographic findings alone cannot reliably predict which horses will show lameness; combine imaging with clinical examination including palpation and motion assessment for accurate diagnosis
•CT imaging of the caudal spine and pelvis is a valuable diagnostic tool for horses with hindlimb lameness, poor performance, or suspected lumbosacroiliac pain, as diverse osseous pathologies can be identified
•Be aware that many affected horses have multiple concurrent lesions; finding one abnormality should prompt careful examination for others in the region
•CT findings do not always correlate with clinical signs—imaging results must be interpreted alongside clinical examination and response to treatment, as causality remains unproven
•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
•When hindlimb lameness fails to respond to regional anaesthesia of the limb itself, consider referred pain sources—caudal rib fractures should be on your differential list
•Use local anaesthetic blocks around suspected rib fractures to confirm they are the pain source before committing to long rest periods
•Gamma scintigraphy is valuable for identifying occult caudal rib fractures that may not be obvious on physical examination or standard imaging
•Acupuncture diagnosis may serve as a complementary tool for detecting hindlimb lameness, particularly hock pain, when traditional lameness examinations are inconclusive
•Palpation sensitivity at GB-27, SP-13, BL-39a, and BL-39b acupoints warrants clinical assessment in sport horses with suspected hock lameness
•Consider combining acupuncture diagnosis with objective sensor-based gait analysis and intra-articular analgesia blocks for more confident hock pain localization
•CT imaging should be used to confirm diagnosis and assess for concurrent stifle pathology before surgical planning for suspected caudal cruciate ligament injuries
•The cranial intercondylar arthroscopic approach is a viable surgical option but may not always allow complete fragment removal; surgeons should be prepared for potential arterial bleeding complications
•Most horses achieve good functional outcomes and return to work even when complete fragment removal is not achieved, though long-term follow-up data remains limited
•Traumatic synovial herniation is a potential but rare cause of acute hindlimb lameness; suspect it when grade 4/5 lameness occurs with medial femorotibial joint effusion
•Ultrasound can identify synovial membrane disruption, but arthroscopy may be needed for definitive diagnosis and to assess capsular integrity
•Conservative management with rest, NSAIDs, and biologic therapies can improve clinical lameness even when synovial hernias persist sonographically
•Consider TMJ pathology in the differential diagnosis for horses presenting with unexplained dangerous or unpredictable behaviour under saddle, particularly when accompanied by audible joint sounds or tongue protrusion
•TMJ analgesia testing can help identify whether TMJ pain is contributing to lameness or behavioural signs before committing to arthroscopic surgery
•Recognise that TMJ cysts and osteoarthritis may require multimodal treatment approaches and that surgical intervention alone may not resolve all clinical signs
•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
•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
•Deep branch lateral plantar neurectomy with fasciotomy is a viable surgical option for hind limb PSD in western performance horses, with most returning to some level of work
•Plan for approximately 8 months recovery time before resuming athletic training post-operatively
•Set realistic expectations with owners: while most horses improve, only about 43% return to their previous level of performance
•When OCLLs occur on the convex surface of the proximal phalanx where conservative drilling/screw placement is technically difficult, joint arthrodesis combined with biocement filling may be a viable surgical option
•This approach may be particularly suitable for young horses with significant lameness from large, clinically relevant phalangeal cysts
•Three-screw arthrodesis technique (two paraxial, one axial crossed lag screw) provides stable fixation for this procedure
•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
•When dealing with chronic hindlimb suspensory ligament injuries, CT and MRI provide superior diagnostic detail compared to ultrasound alone, particularly for identifying extensive adhesions that may affect prognosis
•Air entrapment within fibrous adhesions seen on CT imaging may indicate chronicity and tissue compromise relevant to treatment planning and athletic soundness prediction
•Multimodal imaging (ultrasound, CT, and MRI) together offers the most complete assessment of chronic SL branch desmitis and should be considered for valuable horses with prolonged lameness
•AMG using the CURO system offers a new objective, quantitative tool to detect PSL injuries earlier and more reliably than traditional clinical assessment alone
•CURO scoring thresholds (>5 healthy, 2.5-4.5 mild injury, <2 severe injury) provide practical benchmarks for grading PSL damage and monitoring treatment response
•This non-invasive acoustic modality could complement ultrasound and lameness evaluation to guide treatment decisions and rehabilitation protocols for PSL-injured horses
•Ultrasonographic findings of hindlimb suspensory ligament lesions are reliable indicators of pathology and should guide clinical decision-making
•Post-surgical recurrent lameness in PSD cases may result from adhesion formation rather than incomplete ligament healing, which may require different management strategies
•Expect significant muscle involvement (97% of cases) and potential adhesion formation when diagnosing proximal suspensory desmopathy
•Transcondylar screw fixation is a simple, effective surgical option for medial femoral condylar cystic lesions causing hindlimb lameness, with ~75% success rate and no specialized equipment required
•Plan for 120 days of restricted activity before returning horses to work; younger horses (<3 years) may have better prognosis than older animals
•Adjunctive biologic therapies (autologous cells/products) do not improve outcomes when screw fixation is used, so they are not necessary additions to this procedure
•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
•When investigating hindlimb lameness, specifically assess the accessory ligament of the suspensory ligament ultrasonographically, particularly when proximal suspensory desmopathy is present — this structure is commonly injured alongside it
•Lameness associated with this injury may only be apparent during ridden work, so dynamic examination under saddle is essential for diagnosis
•Perineural analgesia blocking the deep branch of the lateral plantar nerve may help localize the problem, but be prepared that some cases may require tibial nerve blocks for complete diagnostic confirmation
•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
•Friesian horses presenting with chronic hindlimb lameness localized to the fetlock should be evaluated for axial sesamoid osteitis using advanced imaging (MRI preferred), as this condition may be breed-predisposed
•The intimate relationship between sesamoid bone and intersesamoidean ligament means lesions in one structure typically involve the other; treatment strategies must address both components
•Prognosis appears guarded based on case outcomes; early detection via imaging and aggressive management protocols are warranted to prevent progression to irreversible degenerative changes
•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
•Bilateral acute suspensory rupture in a young foal is rare; when suspected, ultrasonography and radiography are essential diagnostic tools to confirm the diagnosis and assess joint involvement
•Elevated serum muscle enzymes (AST, ALT, LDH, CK) may accompany acute suspensory injury and warrant investigation of the locomotor system
•Early recognition of suspensory ligament rupture is critical as secondary complications including sesamoid bone displacement and pastern joint subluxation can develop acutely
•Multiple keratomas can occur simultaneously in a single hoof and should be considered in cases of unexplained lameness with hoof wall abnormalities
•Radiographic imaging is essential for identifying keratomas, which appear as radiolucent areas on the distal phalanx
•Surgical hoof wall resection is an effective treatment approach for removing keratomas and resolving associated lameness
•Inertial sensors offer an objective, quantifiable alternative to subjective lameness assessment for diagnosing and monitoring hindlimb lameness in clinical practice
•This technology can help evaluate the effectiveness of treatments and therapeutic interventions by providing measurable baseline and post-treatment comparisons
•Objective lameness measurement supports evidence-based medicine by providing reproducible data for treatment outcome evaluation
•Consider incomplete sagittal talus fracture in racehorses presenting with hindlimb lameness; diagnosis requires specific oblique radiographic views and nuclear scintigraphy
•Conservative treatment can successfully return most affected horses to racing without surgery, making this a manageable injury with reasonable athletic outcome
•Establish baseline pre-injury performance records to objectively assess post-injury return to racing and functional recovery
•Sacroiliac joint pathology should be considered as a differential diagnosis in horses presenting with poor performance, back pain, or hindlimb lameness rather than assuming it is a diagnosis of exclusion
•A validated injection technique is now available for therapeutic intervention and diagnostic confirmation of sacroiliac joint involvement
•Practitioners should develop skill in this periarticular injection technique to improve diagnostic accuracy and treatment options for performance horses
•Relying on a single tuber coxae movement observation method can lead to misdiagnosis—use Hip_hike_diff as your primary method but always cross-check with additional assessment techniques
•Be aware that horses with hindlimb lameness may adopt compensatory pelvic movement patterns that can mask or alter typical lameness signs, requiring careful multi-method evaluation
•Incorporate multiple tubera coxarum-based comparisons into your lameness assessment protocol to improve diagnostic confidence and accuracy in everyday practice
•US-guided tibial nerve blocks are significantly more likely to successfully stain the nerve than blind anatomical techniques, which may improve diagnostic anaesthesia efficacy in lameness work-ups
•Even with ultrasound guidance, nerve staining was not achieved in ~14% of attempts, suggesting that technique refinement or multiple injections may sometimes be necessary
•Consider ultrasound guidance for tibial nerve blocks in practice to increase reliability of diagnostic blocks during hindlimb lameness evaluation
•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
•Do not rely solely on visual lameness assessment, even if you have years of experience—objective tools (force plates, inertial measurement units, etc.) are necessary for accurate diagnosis
•Mild lameness and hindlimb lameness are particularly prone to misdiagnosis through visual evaluation alone; these cases warrant instrumental assessment
•Seek peer review and evidence-based validation of your lameness assessments rather than assuming experience guarantees accuracy
•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
•Establish a protocol for professional saddle fit assessment at least annually, and more frequently if work intensity changes
•Evaluate saddle fit both before and after exercise as back dimensions change during work
•Investigate hindlimb lameness as the primary cause when saddle slip occurs, rather than automatically assuming saddle fit problems
•Avoid using numnahs that apply pressure to spinous processes; use pads only temporarily to address specific fit issues
•Experience and training in lameness assessment do matter — experienced clinicians significantly outperform students at recognizing subtle asymmetries in real movement patterns, suggesting continued professional development is worthwhile.
•Computer-based lameness simulations could become valuable tools for training veterinarians and objectively measuring diagnostic competence in lameness detection.
•Visual assessment limitations are universal (approximately 25% amplitude difference threshold), but expertise develops through pattern recognition of authentic lame horse movement rather than abstract motion analysis.
•Inertial sensors placed on the pelvis and withers can objectively quantify mild hindlimb lameness during trotting without requiring expensive motion capture laboratories or specialized arena facilities.
•Pelvic drop asymmetry is a reliable indicator of hindlimb lameness severity, providing a quantifiable metric to track progression or improvement during treatment.
•This trunk-mounted sensor system could enable practitioners to obtain objective lameness data in field conditions, improving diagnostic confidence and allowing evidence-based tracking of therapeutic outcomes.
•Intra-articular corticosteroid injection is effective for improving lameness in distal tarsal joint osteoarthritis in the short term (56 days), with no advantage to adding hyaluronic acid or using a second injection
•Scintigraphy findings may help predict treatment success: diffuse uptake patterns are more likely to respond than focal uptake patterns
•Be cautious about long-term expectations—while initial improvement is significant, only about 38% of horses maintain positive outcomes at extended follow-up, suggesting need for discussion with owners about realistic timelines and potential need for alternative therapies
•Consider talocalcaneal osteoarthritis in cases of acute hindlimb lameness with inconsistent diagnostic analgesia results and hock flexion-induced pain, as clinical signs are non-specific and easily missed.
•Conservative treatment including intra-articular medications is largely ineffective for this condition; early referral for surgical arthrodesis should be considered rather than prolonged conservative management.
•Nuclear scintigraphy showing uptake plantaromedially in the talus region and lateromedial radiographic views demonstrating subchondral changes support the diagnosis when clinical findings are ambiguous.
•Veterinarians performing stifle ultrasonography now have anatomical reference material to accurately identify normal and abnormal structures, improving diagnostic confidence.
•Understanding cross-sectional anatomy of the medial femorotibial joint improves the ability to detect soft tissue injuries causing hindlimb lameness.
•This comparative approach between gross anatomy and ultrasound images serves as a foundation for standardized stifle ultrasound protocols in equine practice.
•Recognize ALDDFT desmopathy as a differential diagnosis for hindlimb lameness and especially for flexural deformities presenting with knuckling or semiflexion of the metatarsophalangeal joint
•Prognosis differs markedly: acute traumatic injuries have good outcomes (73% return to work), but established postural changes are irreversible with poor prognosis (90% remain lame)
•Ultrasonographic examination is essential for diagnosis, though lesions may be focal; conservative management (rest and controlled exercise) should be attempted first, with surgical intervention (desmotomy/desmectomy) reserved for selected cases
•The sacroiliac joint is highly stable with minimal normal movement; clinical signs attributed to SIJ disease may reflect dysfunction rather than instability
•Ligament integrity is critical to SIJ stabilization—ligamentous tears observed at necropsy likely compromise joint support and warrant investigation as sources of hindlimb lameness
•Current in vivo assessment methods for SIJ pathology are limited due to the small magnitude of normal movement; rely on clinical signs, imaging, and response to localized treatment rather than movement analysis
•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 evaluating hindlimb lameness with no obvious cause, ultrasound the patellar ligaments—injury is a real possibility and may be the primary diagnosis
•Middle patellar ligament desmitis is the most common patellar ligament injury and often results in poor athletic prognosis; set realistic expectations with owners
•Establish baseline ultrasound images of normal patellar ligaments in your practice to improve recognition of subtle changes and early damage

Key Research Findings

No significant differences in head or pelvic movement asymmetry between xylazine (0.3 mg/kg) and saline treatment groups at 20 and 60 minutes

Rettig M J, 2016

Some horses with mild forelimb lameness showed large decreases in head movement asymmetry at 60 minutes post-xylazine sedation

Rettig M J, 2016

Low-dose xylazine sedation did not mask hindlimb lameness amplitude measurements

Rettig M J, 2016

Caution advised for forelimb lameness evaluation in mildly lame horses under xylazine sedation due to potential masking effects

Rettig M J, 2016

93.6% of 235 horses presented lameness during examination

A. Rodrigues, 2025

59.5% of lame horses had forelimb lameness versus 40.5% with hindlimb lameness

A. Rodrigues, 2025

Impact lameness was the most frequent type in both forelimbs and hindlimbs

A. Rodrigues, 2025

Distal forelimb regions were most affected while proximal lower hindlimb regions were most affected

A. Rodrigues, 2025

Sound horses showed high symmetry in breakover duration between contralateral limbs (mean 168ms, absolute difference 6ms, p=0.07)

Briggs Eloïse Virginia, 2024

Lame horses exhibited significantly longer breakover duration in affected limbs (167ms) versus contralateral limbs (146ms, p<0.001)

Briggs Eloïse Virginia, 2024

Ipsilateral (160ms) and diagonal (162ms) limbs showed breakover durations comparable to sound horses, indicating compensation pattern

Briggs Eloïse Virginia, 2024

Breakover duration asymmetry may serve as a quantifiable marker for detecting lameness in equine gait analysis

Briggs Eloïse Virginia, 2024

In forelimb lame horses, 80-81% showed head and withers asymmetry indicating lameness in the same forelimb

Persson-Sjodin, 2023

In hindlimb lame horses, 69-72% showed head asymmetry ipsilateral to the lame limb but withers asymmetry diagonal to it, indicating different forelimbs

Persson-Sjodin, 2023

Large compensatory head nods (>15mm) occurred in 28-31% of hindlimb lame horses, with 89-92% showing head and withers asymmetry in different forelimbs

Persson-Sjodin, 2023

Evidence Base

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

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

A. Rodrigues, Ricardo Pozzobon, Grasiela De Bastiani et al. (2025) — Brazilian Journal of Veterinary Medicine

Hindlimb Lameness: What the Research Says

What Professionals Should Know

Key Research Findings

Evidence Base

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

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

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.

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

Evaluation of feedback methods for improved detection of hindlimb lameness in horses among riding instructors and trainers.

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

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.

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

Smartphone-Based Pelvic Movement Asymmetry Measures for Clinical Decision Making in Equine Lameness Assessment.

Agreement among equine veterinarians and between equine veterinarians and inertial sensor system during clinical examination of hindlimb lameness in horses.

Effect of induced hindlimb length difference on body-mounted inertial sensor measures used to evaluate hindlimb lameness in horses.

The relationship between sagittal hoof conformation and hindlimb lameness in the horse.

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.

Identifying optimal parameters for quantification of changes in pelvic movement symmetry as a response to diagnostic analgesia in the hindlimbs of horses.

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.

Management of hindlimb proximal suspensory desmopathy by neurectomy of the deep branch of the lateral plantar nerve and plantar fasciotomy: 155 horses (2003-2008).

Clinical significance of osseous spurs on the dorsoproximal aspect of the third metatarsal bone.

Lameness and effusion of the tarsocrural joints after arthroscopy of osteochondritis dissecans in horses.

Evaluation of a new strategy to modulate skeletal development in racehorses by imposing track-based exercise during growth: the effects on 2- and 3-year-old racing careers.

Cartilage oligomeric matrix protein and hyaluronan levels in synovial fluid from horses with osteoarthritis of the tarsometatarsal joint compared to a control population.

Influence of rider on lameness in trotting horses.

The sacroiliac joints: evaluation using nuclear scintigraphy. Part 2: Lame horses.

Risk factors associated with hindlimb lameness and degenerative joint disease in the distal tarsus of Icelandic horses.

Radiographic and clinical survey of degenerative joint disease in the distal tarsal joints in Icelandic horses.

Computed tomography of the equine caudal spine and pelvis. Pathological findings in 56 clinical cases (2018-2023).

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

Rib fracture as a cause of hindlimb lameness in a horse

Diagnosis of hindlimb lameness using acupuncture points in sport horses

Computed tomographic imaging and surgical management of distal insertional avulsion fragments of the caudal cruciate ligament in four horses.

Traumatic synovial herniation of the medial femorotibial joint as an aetiology of hindlimb lameness in a horse

Arthroscopic treatment of bilateral mandibular condylar cysts and associated osteoarthritis of the temporomandibular joints in a horse

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

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

Outcome following neurectomy of the deep branch lateral plantar nerve and plantar fasciotomy for hindlimb proximal suspensory desmopathy in western performance horses: 21 cases.

Modified Proximal Interphalangeal Joint Arthrodesis in a Yearling Filly with an Osseous Cyst-Like Lesion in the Proximal Phalanx.

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

Suspensory Branch Desmitis in a Horse: Ultrasonography, Computed Tomography, Magnetic Resonance Imaging, and Gross Postmortem Findings.

The Equine Hindlimb Proximal Suspensory Ligament: an Assessment of Health and Function by Means of Its Damping Harmonic Oscillator Properties, Measured Using an Acoustic Myography System: a New Modality Study

Proximal suspensory desmopathy in hindlimbs: A correlative clinical, ultrasonographic, gross post mortem and histological study.

Preliminary investigation of the treatment of equine medial femoral condylar subchondral cystic lesions with a transcondylar screw.

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

Hindlimb lameness associated with proximal suspensory desmopathy and injury of the accessory ligament of the suspensory ligament in five horses

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

Axial osteitis of the proximal sesamoid bones and desmitis of the intersesamoidean ligament in the hindlimb of Friesian horses: review of 12 cases (2002-2012) and post-mortem analysis of the bone-ligament interface.

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

Bilateral degenerative suspensory desmitis with acute rupture in a Standardbred colt

Multiple keratomas in an equine foot.

Assessment of mild hindlimb lameness during over ground locomotion using linear discriminant analysis of inertial sensor data.

Incomplete sagittal fracture of the talus in 11 racehorses: outcome.

Development and validation of a periarticular injection technique of the sacroiliac joint in horses.

Robustness of five different visual assessment methods for the evaluation of hindlimb lameness based on tubera coxarum movement in horses at the trot on a straight line.

Cadaveric comparison of the accuracy of ultrasound-guided versus 'blind' perineural injection of the tibial nerve in horses.

An overview of proximal suspensory ligament desmitis

Reliability of equine visual lameness classification

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?

Saddles and girths: What is new?

Evidence of the development of 'domain-restricted' expertise in the recognition of asymmetric motion characteristics of hindlimb lameness in the horse.

Evaluation of discriminant analysis based on dorsoventral symmetry indices to quantify hindlimb lameness during over ground locomotion in the horse.

Retrospective study of the effect of intra-articular treatment of osteoarthritis of the distal tarsal joints in 51 horses.

Osteoarthritis of the talocalcaneal joint in 18 horses.

Cross-sectional anatomy and comparative ultrasonography of the equine medial femorotibial joint and its related structures.

Two clinical manifestations of desmopathy of the accessory ligament of the deep digital flexor tendon in the hindlimb of 23 horses.

In vitro assessment of movements of the sacroiliac joint in the horse.

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

Normal ultrasonographic anatomy and injury of the patellar ligaments in the horse.