Foot Lameness: What the Research Says
Evidence from 21 peer-reviewed studies
What Professionals Should Know
- •Understanding how lameness is experimentally induced helps contextualize research findings and their applicability to clinical practice
- •Knowledge of reversible induction methods supports evidence-based approaches to foot lameness diagnosis and management
- •Awareness of methodological limitations in lameness research improves critical appraisal of findings relevant to your cases
- •External hoof conformation assessment (angles, shape) cannot reliably predict internal bone structure or lameness risk — radiographic evaluation remains necessary for accurate diagnosis
- •Individual variation in distal phalanx shape is normal and wide; standardised 'ideal' angles may not apply uniformly across horses
- •Poor foot conformation alone should not be assumed to cause lameness; further investigation is needed to identify true biomechanical risk factors
- •Extensive ossification of foot cartilages on radiographs should alert practitioners to increased risk of collateral ligament or distal phalanx injury in lame horses
- •Asymmetric ossification alone is not a reliable predictor of distal phalanx injury and should not be over-interpreted at prepurchase examinations
- •Normal left-right symmetry of ossification patterns can be expected, so significant deviation warrants closer investigation
- •MRI diagnosis of foot lameness enables rational treatment planning rather than empirical approaches, but soft tissue injuries (DDF, CL) carry guarded prognoses for return to full work
- •Traumatic injuries to the middle or distal phalanges are most likely to resolve completely; plan conservative management strategies accordingly
- •Horses with combined DDF and navicular lesions have poor outlooks—discuss realistic expectations with owners and consider early decisions about future athletic use
- •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
- •When performing diagnostic blocks of the stifle, be aware that improvement in distal limb lameness may result from anaesthetic diffusion rather than confirming stifle pathology—interpret results cautiously
- •Consider anatomical proximity of neural structures when evaluating which joint or region is truly responsible for lameness; diffusion effects can create confounding results
- •Use serial blocking protocols (distal to proximal) and allow adequate time between blocks to minimise cross-over effects and improve diagnostic accuracy
- •Conservative management of distal phalanx OCLLs allows some horses to return to racing, but approximately 40% of racing-age horses will not race—set realistic expectations with owners based on individual cases
- •If a horse with this lesion does return to racing, expect performance comparable to unaffected siblings, suggesting lameness rather than permanent structural compromise drives prognosis
- •Radiographic appearance alone (size, sclerosis, location, articular surface irregularity) does not predict racing success, so clinical response and functional improvement should guide decision-making
- •CECT may offer a more accessible and cost-effective alternative to MRI for diagnosing deep digital flexor tendon problems when radiography and ultrasound are inconclusive
- •This validation study supports CECT as a reliable diagnostic tool for foot lameness cases involving DDFT lesions
- •Consider CECT when MRI is unavailable or financially prohibitive for horses with suspected distal deep digital flexor tendinopathy
- •Navicular bursa injections are effective for lameness when primary pathology is bursitis alone; use adequate corticosteroid doses (≥10 mg triamcinolone) for optimal results
- •MRI screening is valuable—horses with erosions on the flexor surface of the navicular bone coupled with DDFT adhesions should be counselled that injection response will likely be poor
- •Expect 7–8 months of usable soundness in successful cases, allowing time to implement complementary therapeutic strategies before lameness recurs
- •Navicular bursoscopy should be considered in lame horses with foot pain localised to the navicular region, as it identifies lesions missed by standard imaging (CT/MRI)
- •Expect to find DDFT tears in nearly all cases of clinical navicular bursa disease, and cartilage damage in approximately one-third of cases
- •Bursoscopy enables minimally invasive treatment, with good prognosis: ~73% of followed horses returned to soundness and pre-injury performance
- •Collateral ligament desmitis of the DIP joint should be considered in cases of foot lameness, particularly when lameness worsens in circles; ultrasound can miss lesions so MRI is recommended for definitive diagnosis
- •Response to palmar digital analgesia (87% improvement) suggests the collateral ligaments of the DIP joint are major pain sources in foot lameness, so careful assessment of this region is warranted
- •Concurrent soft tissue injuries are common (61% of cases), so imaging should evaluate the entire palmar/plantar foot structures including DDFT, navicular region, and distal sesamoidean ligaments
- •Not all imaging findings warrant clinical concern—radiographic navicular changes are common but often subclinical; focus diagnostic efforts on DDFT and DIP joint changes which show higher clinical significance
- •This imaging protocol allows comprehensive assessment of foot lameness cases; consider using when foot pain persists after farriery and basic diagnostics
- •Navicular bursa involvement often coexists with other pathology; treatment plans should address the full diagnostic picture rather than isolated findings
- •PET imaging reveals chondrosesamoidean ligament enthesopathy in a substantial portion of lame horses, suggesting it may be an underrecognized cause of foot pain in clinical practice
- •When evaluating foot pain cases, carefully examine the axial borders of the palmar processes on CT or radiographs as this lesion is easily missed on standard imaging
- •ChSL enthesopathy often occurs alongside other foot pathology but can be the primary lesion, so comprehensive imaging of the entire foot is warranted in lame horses
- •Use modern diagnostic tools to accurately identify foot pathology and select appropriate treatments (conservative vs surgical)
- •Evidence now supports efficacy of various treatment approaches for common foot problems, allowing for more informed clinical decision-making
- •Consider prognostic factors when counseling owners about treatment outcomes for equine foot conditions
- •Ultrasound should be your first imaging choice when evaluating pastern and foot lameness cases; it reliably identifies soft tissue injuries
- •Develop systematic scanning technique using both transverse and longitudinal views at multiple anatomical levels to avoid missing lesions
- •Understanding normal ultrasonographic anatomy is essential to recognizing digital flexor tendon and digital sheath pathology in clinical practice
- •Always attempt to establish a specific diagnosis before designing a therapeutic shoeing plan; symptom-based shoeing has limited effectiveness
- •Recognize that every shoe modification creates trade-offs in foot function—understand the full biomechanical consequences of your design choices
- •Ground your shoeing decisions in evidence-based principles rather than tradition alone to optimize therapeutic outcomes
- •Understanding the comparative strengths of CT, CECT, and standing LFMRI helps practitioners select the most appropriate imaging modality for specific foot pathology types
- •Standing LFMRI offers a non-invasive alternative to traditional imaging without requiring general anesthesia, but clinicians need to know when each modality has superior diagnostic capability
- •Knowledge of imaging limitations prevents missed diagnoses and guides whether additional or alternative imaging is warranted in equine foot lameness cases
- •MRI findings in foot cases can be interpreted with greater confidence when understanding the underlying histopathological changes they represent
- •MRI appears capable of detecting different disease stages in DDFT and navicular bone, potentially improving prognosis and treatment planning
- •Further research is still needed to fully understand the causes and progression of foot lameness—use MRI findings alongside clinical assessment, not as definitive standalone diagnosis
- •Consider distal deep digital flexor tendonopathy in horses with foot lameness that doesn't fit typical diagnoses; regional analgesia blocks and careful clinical examination can help narrow your differential
- •MRI is essential for definitive diagnosis—radiographs and ultrasound alone are insufficient for this condition
- •Counsel owners on a guarded prognosis for return to full soundness, but mention that emerging treatments may improve outcomes
- •Negative radiographs do not rule out significant DDFT injuries—consider MRI for horses with persistent digit lameness when standard imaging is unremarkable
- •Palmar digital nerve blocks are unreliable for confirming DDFT as the sole pain source; intra-articular DIP joint analgesia is more useful diagnostically and therapeutically
- •Ultrasonography has poor sensitivity for distal pastern region DDFT lesions; MRI is superior for accurate diagnosis and lesion characterization
- •Maintain expertise in foot and pastern radiography techniques—newer imaging modalities have not replaced radiographs in routine lameness diagnosis
- •Stay current with radiographic technique improvements to accurately identify common foot conditions in your practice
- •Understand proper diagnostic analgesia interpretation alongside radiographic findings for accurate localization of lameness
Key Research Findings
Multiple reversible methods exist for experimentally inducing foot lameness in horses for research purposes
Published methods vary in their application, duration, and reversibility characteristics
Literature review identifies limitations in current experimental lameness induction protocols
Research utilizing reversible foot lameness induction contributes to improved understanding of equine foot pathophysiology
Modest correlation exists between hoof wall/heel angles and distal phalanx angles, but not strong enough to predict internal structures from external appearance
Distal phalanx shape varies considerably between individual horses, primarily due to differences in solar border orientation
No significant association found between distal phalanx angles and injury type, suggesting hoof conformation alone is not a strong predictor of lameness
Weak trend observed for smaller dorsal distal phalanx angles in horses with podotrochlear apparatus or DDFT injuries compared to other injury groups
Possibly significant ossification (grade >3) occurred in 12.8% of feet and was significantly associated with collateral ligament and distal phalanx injuries
Left-right symmetry of ossification was observed between feet, with lateral cartilages more ossified than medial cartilages
Distal phalanx injury was associated with mediolateral asymmetry in ossification grade of ≥2
Marked asymmetry of ossified cartilages did not increase likelihood of distal phalanx injury
Deep digital flexor tendonitis was the most common MRI-identified foot injury (59% of cases), with primary DDF tendonitis in 33% and combined DDF/navicular lesions in 14%
Collateral ligament desmitis of the DIP joint was the second most common injury (31% of cases), present as primary injury in 15% and in combination with other injuries in 16%
Return to full athletic function occurred in only 28% of horses with primary DDF lesions and 29% with primary CL desmitis, but 71% of horses with traumatic phalanx injuries achieved excellent outcomes
Evidence Base
Reversible foot lameness induction in the horse
Beasley Brian, Dockery Allison, Moorman Valerie J. (2025) — Equine Veterinary Education
An investigation of the relationships between angles and shapes of the hoof capsule and the distal phalanx.
Dyson S J, Tranquille C A, Collins S N et al. (2011) — Equine veterinary journal
Is there an association between ossification of the cartilages of the foot and collateral desmopathy of the distal interphalangeal joint or distal phalanx injury?
Dyson S, Brown V, Collins S et al. (2010) — Equine veterinary journal
Lameness associated with foot pain: results of magnetic resonance imaging in 199 horses (January 2001--December 2003) and response to treatment.
Dyson S J, Murray R, Schramme M C (2005) — Equine veterinary journal
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.
Katrinaki Vasiliki, Estrada Roberto J, Mählmann Kathrin et al. (2023) — Equine veterinary journal
Intra-articular anaesthesia of the equine stifle improves foot lameness.
Radtke A, Fortier L A, Regan S et al. (2020) — Equine veterinary journal
Radiographic Identification of Osseous Cyst- Like Lesions in the Distal Phalanx in 22 Lame Thoroughbred Horses Managed Conservatively and Their Racing Performance.
Peter Vanessa G, O'Keeffe Thomas A, Smith Lewis C R et al. (2018) — Frontiers in veterinary science
Contrast-enhanced computed tomographic evaluation of the deep digital flexor tendon in the equine foot compared to macroscopic and histological findings in 23 limbs.
van Hamel S E, Bergman H J, Puchalski S M et al. (2014) — Equine veterinary journal
Outcomes of podotrochlear (navicular) bursa injections for signs of foot pain in horses evaluated via magnetic resonance imaging: 23 cases (2005-2007).
Bell, Howard, Taylor et al. (2009) — Journal of the American Veterinary Medical Association
Endoscopic assessment and treatment of lesions of the deep digital flexor tendon in the navicular bursae of 20 lame horses.
Smith, Wright, Smith (2007) — Equine veterinary journal
Collateral desmitis of the distal interphalangeal joint in 18 horses (2001-2002).
Dyson S J, Murray R, Schramme M et al. (2004) — Equine veterinary journal
Contrast Enhanced Computed Tomography Findings in 105 Horse Distal Extremities.
Pauwels Frederik, Hartmann Angela, Alawneh John et al. (2021) — Journal of equine veterinary science
Chondrosesamoidean ligament enthesopathy: Prevalence and findings in a population of lame horses imaged with positron emission tomography.
Norvall Amy, Spriet Mathieu, Espinosa Pablo et al. (2021) — Equine veterinary journal
Recent advances in conservative and surgical treatment options of common equine foot problems.
Gutierrez-Nibeyro S D, McCoy A M, Selberg K T (2018) — Veterinary journal (London, England : 1997)
Ultrasonographic examination of the palmar aspect of the pastern of the horse: Digital flexor tendons and digital sheath
Coudry V., Denoix J.‐M. (2013) — Equine Veterinary Education
Therapeutic farriery: one veterinarian's perspective.
Parks (2013) — The Veterinary clinics of North America. Equine practice
Comparisons of computed tomography, contrast-enhanced computed tomography and standing low-field magnetic resonance imaging in horses with lameness localised to the foot. Part 2: Lesion identification.
Vallance S A, Bell R J W, Spriet M et al. (2012) — Equine veterinary journal
Relationship between histopathological lesions and magnetic resonance imaging (MRI) in diseases of the foot of the horse
Schramme Michaël (2012) — Bulletin de l'Académie Vétérinaire de France
Deep digital flexor tendonopathy in the foot
Schramme M. C. (2011) — Equine Veterinary Education
Lameness in 46 horses associated with deep digital flexor tendonitis in the digit: diagnosis confirmed with magnetic resonance imaging.
Dyson S, Murray R, Schramme M et al. (2003) — Equine veterinary journal