Net joint moments and joint powers in horse with superficial digital flexor tendinitis

Objective-To determine whether analysis of net joint moments and joint powe rs is a suitable technique for evaluation of mechanics and energetics of la meness in horses and to measure effects of superficial digital flexor tendi nitis. Animals-6 sound horses. Procedure-Horses were evaluated before (sound evaluation) and after (lame e valuation) induction of superficial digital flexor tendinitis in 1 forelimb by injection of collagenase. Recordings were made with an optoelectronic s ystem and a force plate as horses trotted. Net joint moments and joint powe rs in the sagittal plane at each joint in the forelimbs during the stance p hase were determined. Peak values were determined, and mechanical energy ab sorbed and generated at each joint was calculated. Comparisons were made be tween contralateral limbs during sound and lame evaluations. Results-Lame limbs had significant reductions in peak values for net joint moments on the palmar aspect of metacarpophalangeal (fetlock), carpal, and humeroulnar joints. Total energy absorbed was significantly lower at every joint in lame limbs, compared with compensating limbs. Conclusions and Clinical Relevance-Horses with superficial digital flexor t endinitis had significant differences between lame and compensating limbs f or net joint moments and joint powers at all joints, indicating that the ga it of horses with superficial digital flexor tendinitis is energetically in efficient. Assessment of net joint moments and joint powers is a useful too l in evaluating equine lameness.