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A muscle separating approach with tenotomy of the teres minor was used to expose osteochondritis dissecans lesions in the shoulder joints of five horses. Horses selected for surgery were severely lame or had a long history of lameness. Adequate surgical access allowed removal of cartilage flaps, curettage of the subchondral bone, and in one horse, the removal of an osteocartilaginous free body. Surgical wounds healed by primary intention; one horse developed a seroma that was drained. Three of the five horses were clinically sound 3 months following surgery. Two other horses were pasture sound but lame after extensive athletic activity.