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Ruptured Peroneus Tertius
Peroneus Tertius Tendon Rupture in Horses
Introduction
A fairly common injury to the upper hind leg is rupture of the peroneus tertius. The peroneus tertius (PT) is a tendon, which starts as a branch of the long digital flexor tendon. The tendon travels downward over the front (cranial) aspect of the tibia between the cranial tibialis and long digital extensor muscles. As it reaches the hock, the tendon divides into a lateral branch that inserts on the fibular and fourth tarsal bones and a medial branch that inserts on the third tarsal and proximal third metatarsal bones. This article covers diagnosis, cause, treatment, and prognosis of rupture of the peroneus tertius.
Cause
Rupture of the peroneus tertius occurs when the hock is rapidly forced into extension (straightened) while the leg, particularly the stifle, is flexed. This could occur during a stumble forward or when a leg is caught in a fence while jumping.
Clinical Signs
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