Probable avulsion of the infraspinatus tendon of insertion in a Rottweiler

Abstract CASE HISTORY: An 8.5-month-old male Rottweilerwas presented with chronic, non-localisable, right forelimb lameness. CLINICAL FINDINGS: Survey radiographs revealed panosteitisin the right antebrachium and an irregularly marginated radiolucency on the lateral aspect of the proximal left humerus. The tendonof insertion of the left infraspinatus musclewas enlarged, some tendonfibres ended prematurely in a cluster of mineralised particles, and there was a large bony defect at the point of insertion. DIAGNOSIS: Probable avulsionof the left infraspinatus tendon. CLINICAL RELEVANCE: This case was particularly unusual due to the marked prominence of the lesion without lamenessof the left forelimb. Avulsionof the infraspinatus tendonis poorly described in the veterinary and medical literature.