Complications of Hinged External Fixation Compared With Cross-pinning of the Elbow for Acute and Subacute Instability

Abstract

Elbows that are unstable after injury or reconstructive surgery often are stabilized using external fixation or cross-pinning of the joint supplemented by cast immobilization. The superiority of one approach or the other remains a matter of debate. We compared patients treated with external fixation or cross-pinning in terms of (1) adverse events, (2) Broberg and Morrey scores, and (3) ROM. Between 1998 and 2010, 19 patients (19 elbows) had hinged external fixation and 10 patients (11 elbows) cross-pinning and casting for subacute or acute posttraumatic elbow instability. Our general indications for both techniques were persistent elbow instability after usual treatment. Initially, we used external fixation for delayed treatment of fracture-dislocations and cross-pinning for simple elbow dislocations in patients who could not tolerate surgery, but more recently we have used cross-pinning for both indications. Adverse events, elbow scores, and ROM were retrospectively evaluated by chart review, with the latter two end points being calculated at a mean of 31 months (range, 5-83 months) and 10 months (range, 5-21 months) after index procedure for the patients treated with external fixation and cross-pinning, respectively. Seven of 19 patients treated with external fixation experienced nine device-related adverse events: three pin tract infections, two nerve problems, one broken pin, one residual subluxation, one suture abscess, and one pin tract fracture of the ulna resulting in a nonunion. Of the 10 patients (11 elbows) treated with cross-pinning, one patient had pin tract inflammation that resolved with pin removal. Mean Broberg and Morrey score was 90 (95% CI, 84-95) after external fixation and 90 (95% CI, 84-96) after cross-pinning (p = 0.88). There were no differences between the external fixation and cross-pinning groups in mean flexion (123° versus 128°, p = 0.49), extension (29° versus 29°, p = 0.97), forearm pronation (68° versus 74°, p = 0.56), and forearm supination (47° versus 68°, p = 0.15). When the elbow remains unstable after reduction and usual treatment for fractures and dislocations or has been out of place for more than 2 weeks, both cross-pinning and external fixation can help maintain elbow alignment while structures heal. Hinged external fixation is associated with more adverse events related to the device, but Broberg and Morrey score and ROM are similar between techniques. Level III, therapeutic study. See Instructions for Authors for a complete description of levels of evidence.