Technique for ensuring ulnohumeral reduction during application of the Richards compass elbow hinge

The compass elbow hinge is an externally applied device that allows both active and passive range of motion after placement. It is effective for treatment of posttraumatic elbow contractures and of the arthritic elbow with posttraumatic arthritis and also in cases of acute instability despite radial head replacement or fracture fixation and ligamentous repair. The device is technically challenging to apply and requires that the assistant maintain ulnohumeral reduction during application, particularly of the ulnar pins. We describe a simple technique that ensures reduction and shortens surgical time tremendously.