1 INTRODUCTION Pain and pathology originating from the stifle are important causes of hindlimb lameness in the horse.1 Patellar ligament (PL) injuries are increasingly being recognized in horses,2 but only a limited number of studies describe diagnosis, treatment, and prognosis for such injuries.3-5 In human recreational and professional athletes performing jumping sports, patellar tendinopathy (also known as “jumper's knee”) is a common orthopedic complaint,6, 7 with the patient experiencing...