A Novel Surgical Approach to Avian Femorotibiotarsal Luxation Repair.

ABSTRACT

A 3-month-old male umbrella cockatoo (Cacatua alba) was presented because of acute non-weight-bearing lameness of the right leg. Marked soft tissue swelling was present around the femorotibiotarsal (stifle) joint, and the radiographic diagnosis was right medial femorotibiotarsal subluxation. Surgical management was elected, and the stifle joint was approached via a lateral parapatellar incision. Joint exploration revealed damage to the lateral meniscus, tendon of origin of the cranial tibial muscle, and cranial cruciate ligament. After debriding the disrupted meniscus, the stifle joint was anatomically reduced. The femorotibiotarsal joint was stabilized by using a lateral extracapsular suture in a modified technique using a self-tapping cortical screw in the lateral femoral condyle and a hole through the proximal tibiotarsus. The bird regained function of the femorotibiotarsal joint for 3 months after surgery, allowing sufficient time for the bird to establish a physiologic perching angle so that ankylosis occurred to maintain functionality of the leg as a unit. This combination of orthopedic techniques adapted from techniques commonly used in small companion-animal species may be considered to provide young birds with femorotibiotarsal luxations and subluxation a good quality of life despite ankylosis of the joint.