Bilateral hypoplasia of the minor tubercle of the humerus with medial luxation of the biceps tendon in two Quarter Horses

Abstract

Summary Two Quarter Horses were examined at the Washington State University Veterinary Teaching Hospital with forelimb lameness. Case 1 was a 4‐year‐old female with a 4 month history of intermittent forelimb lameness that had partially responded to oral anti‐inflammatories. The horse was in full training and actively competing in cutting. Case 2 was a one‐year‐old filly bred for cutting that presented with a right forelimb lameness of 3 weeks’ duration, which was not responsive to oral anti‐inflammatories. The horse was not in training. On lameness examination, Case 1 was grade 1/5 (American Association of Equine Practitioners scale) lame in the left forelimb in a straight line on a hard surface, extension and flexion of the shoulder was resented and exacerbated the lameness. Case 2 was grade 3/5 lame in the right forelimb in a straight line on a hard surface, flexion and extension of the shoulder was resented and exacerbated the lameness. Both horses had a characteristic dished appearance to the dorsal aspect of the shoulder, with prominence of the proximal aspect of the humerus. Ultrasound and proximodistal oblique (skyline) radiographic views of the scapulohumeral joints demonstrated bilateral hypoplasia of the minor tubercle of the humerus with bilateral medial luxation of the proximal biceps tendon in both cases. To the authors' knowledge this is the first report of 2 cases of bilaterally affected horses, as well as the first report of the condition in the Quarter Horse breed.

Dysplasia of the sulcus intertubercularis with medial luxation of the proximal tendon of the biceps brachii

“…The paper written by Lund et al . () presents 2 cases of bilateral hypoplasia of the minor tuberculum with medial luxation of the proximal tendon of the biceps brachii . This is the first time that this rare condition has been described in Quarter Horses.…”

Standing biceps brachii tenectomy to treat chronic bicipital tendinopathy associated with bursal fibrosis and humeral adhesions in a Quarter Horse gelding

“…Bicipital apparatus pathologies previously reported include infectious and noninfectious bursitis, tendonitis, mineralisation/ossification, congenital abnormalities, bicipital biceps tendon rupture, humeral fractures and a bicipital bursitis, tendonitis and humeral osteitis disease complex (Gillis 1996;Vatistas et al 1996;Hawe and McDiarmid 1999;Bleyaert and Madison 1999;Fugaro and Adams 2002;Forresu et al 2006;Boys Smith and Singer 2007;Spadari et al 2009;Coudry et al 2010;Diaz et al 2010;Lund et al 2014).…”