Evaluation of Surgical Repair of Humeral Condylar Fractures Using Self-Compressing Orthofix Pins in 23 Dogs

Objective— To report short- and long-term clinical and radiographic outcomes in dogs with humeral condylar fractures repaired using self-compressing Orthofix pins. Study Design— Retrospective evaluation with solicited long-term clinical and radiographic evaluations. Animals— Twenty-three dogs with humeral condylar fractures. Methods— Medical records and radiographs were reviewed. Owners were asked to return dogs for long-term clinical and radiographic evaluation. Results— Dogs were aged 1.5–26 months (mean±SD, 5.8±5.0 months) with 20 dogs weighing <5 kg (mean, 3.6±2.8 kg). Of 21 dogs with immediate post-operative radiographs, 10 had anatomic reduction with the rest having either a step and/or gap at the articular surface. Kirschner wire migration and implant loosening were the most common post-operative complications. All fractures with adequate follow-up radiographic evaluations achieved union. Twelve of 13 dogs returned for long-term evaluation (mean, 19.0±18.5 months) were either sound (10 dogs) or had subtle, weight-bearing lameness (2). Fourteen dogs had radiographs ≥75 days after surgery (mean, 18.7±18.3 months), 8 dogs (57%) had no radiographic evidence of osteoarthritis (OA; mean OA score, 0.8; median 0), and all dogs had good or excellent limb function. Conclusions— Self-compressing Orthofix pins are suitable implants for the stabilization of humeral condylar fractures in small breed dogs. Implants were convenient and simple to use and complications were easily resolved. Dogs consistently had good long-term clinical and radiographic outcomes with no or minimal lameness and OA. Clinical Relevance— Self-compressing Orthofix pins should be considered for the repair of humeral condylar fractures in small breed dogs.