Proximal radius fracture with caudal subluxation of the ulna in a dog: Reverse lesion of Monteggia’s

ABSTRACT: This paper aims to describe a new type proximal antebrachial fracture-dislocation lesion. A client-owned, 5-year-old male, intact, 28kg Golden retriever is the case of this paper. The fracture was repaired with a 4-holed standard 3.5 reconstruction plate and screws. However, this fixation caused a further dislocation of the ulna and prevented the reduction of the ulna into its place. Therefore, a dynamic ulnar osteotomy and ulnar IM pining were performed to release plate-caused tension on the elbow joint. After the splinted bandage removal the dog had weight-bearing lameness, but gradually improved over time. The owner reported that the dog had intermittent lameness for a few minutes right after waking up on some days. A slight soft tissue thickening and the periosteal reaction were determined on the 4th and 6th-week evaluations. The joint range of motion values (extension and flexion) was slightly lower than the healthy side. Monteggia fracture describes a specific lesion of the proximal antebrachium, no other specific fracture-sub/luxation lesion of proximal antebrachium has been described in humans and animals. Therefore, the patient with a proximal radial fracture and ulnar luxation/subluxation can be considered a new type of proximal antebrachial lesion. Keywords: Dog elbow, proximal antebrachium, radius fracture, reverse Monteggia, ulnar dislocation