Rupture of the peroneous tertius in a horse

Rupture of the peroneous tertius was diagnosed in a 7-year-old stallion, based on clinical examinations. The stiflejoint flexed as the limb was advanced forward withoutflexing the hock. When the limb was pulled backward, the hock joint extended but the stifle was in the normal position. The recommended treatment included complete stall rest for 6 weeks followed by limited exercise for 2 months. The animal, ultimately, returned backto its normal exercise.