Bi-plane tibial wedge osteotomy in a miniature donkey colt

A three week old intact male miniature donkey presented for evaluation of a congential hindlimb malformation. He had required assistance at delivery, due to a mild dystocia caused by the malformation. On presentation, his left tibia had a mid-diaphyseal valgus deformity of approximately 80 degrees, internal rotation at the distal tibia, and a malformation within the tarsus that reduced its range of motion. Both forelimbs and his right hindlimb were normal. On further physical examination, the foal was found to have a grade III/VI holosystolic heart murmur, and an underdeveloped prepuce. He was otherwise bright and energetic, and could ambulate awkwardly for short periods on his three normal limbs. A bi-plane tibial wedge osteotomy was performed to address the complex malformation of the left tibia and hock. After surgery, the foal was able to use the left hindlimb in a "peg-leg" fashion, and was discharged with extensive instructions that included physical therapy and appropriate transitional shoeing