Type II Monteggia Lesion with Complete Elbow Dislocation in a Cat

Abstract

A 2-year-old neutered male cat was presented for right forelimb non-weight-bearing lameness. A fracture of the proximal third of the ulna (associated with a caudal radio-humeral and humero-ulnar dislocations and a radio-ulnar dislocation) was radiographically identified, leading to a diagnosis of type II Monteggia lesion with complete elbow joint dislocation. The ulnar fracture was reduced and stabilized using an intramedullary pin. During surgery, the lateral collateral ligament and the annular ligament appeared disrupted. The radio-ulnar dislocation was reduced and stabilized, using a double-loop suture prosthesis passing through the metaphysis of the ulna and around the radial head. The radio-humeral dislocation was reduced and stabilized using a lateral collateral suture prosthesis. No postoperative complications were observed and the patient regained good elbow joint range of motion, with no significant lameness at 8 postoperative months.