Atraumatic bilateral avulsion of the origins of the gastrocnemius muscle.

A golden retriever was presented with a prolonged history of a persistent lameness of the hindlimbs and the recent development of a plantigrade stance. Radiography showed bilateral chronic changes associated with the origins of both the lateral and medial heads of the gastrocnemius muscles. Surgical correction was carried out sequentially, with good results three months postsurgically and after a three-year follow-up.