Sagittal distal limb kinematics inside the hoof capsule captured using high-speed fluoroscopy in walking and trotting horses.
Authors: Roach J M, Pfau T, Bryars J, Unt V, Channon S B, Weller R
Journal: Veterinary journal (London, England : 1997)
Summary
High-speed fluoroscopy has overcome a longstanding challenge in equine biomechanics by enabling direct visualisation of skeletal motion within the hoof capsule, allowing researchers to measure dorsal angles of the proximal and distal interphalangeal joints throughout the stance phase in six sound horses at walk and trot. Range of motion differed significantly between gaits and across the stance phase (P<0.001), with the proximal interphalangeal joint showing 9.7° movement at walk versus 8.7° at trot, whilst the distal interphalangeal joint demonstrated substantially greater excursion at 28.6° and 26.5° respectively; considerable inter- and intra-individual variation was also evident in both joints. These findings establish a baseline for normal internal distal limb kinematics, though notably the distal interphalangeal joint range was smaller than previously published data derived from external marker-based techniques, highlighting how methodology fundamentally affects our understanding of hoof biomechanics. For practitioners, this non-invasive imaging approach promises future assessment of soft tissue strain in the tendons and ligaments commonly implicated in navicular disease and other distal limb pathologies, potentially enabling earlier detection and more targeted intervention strategies.
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Practical Takeaways
- •High-speed fluoroscopy offers a non-invasive method to assess internal distal limb mechanics that cannot be visualized with standard external measurement techniques, potentially improving diagnosis of hidden soft tissue injuries
- •Individual horses show considerable variation in distal limb kinematics during normal movement, suggesting lameness assessment should account for individual baseline mechanics rather than assuming a single 'normal' pattern
- •Future applications of this technology may enable measurement of tendon and ligament strain within the hoof capsule, offering new insights into common sites of lameness such as DDFT and collateral sesamoidean ligament injuries
Key Findings
- •High-speed fluoroscopy successfully visualized distal limb kinematics inside the hoof capsule in non-lame horses
- •PIPJ range of motion was 9.7±2.7° at walk and 8.7±3.0° at trot; DIPJ range of motion was 28.6±4.6° at walk and 26.5±6.3° at trot, with significant differences between gaits (P<0.001)
- •Both inter-horse and intra-horse variations were significant for joint angles (P<0.001), indicating individual kinematic differences
- •DIPJ range of motion was smaller than previously reported values, suggesting previous methodologies may have overestimated joint motion