ASEPTIC NONUNION OF HUMERAL SHAFT FRACTURES TREATED BY PLATE FIXATION AND BONE GRAFT

Abstract

Purpose: Nonunion of the humeral shaft is an uncommon complication of diaphyseal fractures. The rate of nonunion reported in the literature is nevertheless very variable, ranging from 1 to 10%. There are many causal and favouring factors often related to a technical error or poor therapeutic indication. There are several ways to treat humeral shaft fractures (orthopaedic treatment, locked centromedullary nail, ascending pinning, plate fixation, external fixation). Rigorous technique and rigorous indications are the key to success.

Material and methods: We reviewed 35 patients with aseptic nonunion of the humeral shaft between 1995 and 2000. The nonunion resulted from imperfect initial treatment in 24. Mean age was 44 years; fracture of the mid third of the shaft was oblique or transverse in general; all types of initial treatments had been used but ascending pins predominated (16 cases). All patients were reoperated for external plate fixation with a cancellous or corticocancellous bone graft after identifying the radial nerve.

Results: All patients achieved consolidation within a mean delay of 15 weeks with good shoulder (mean elevation 135°) and elbow (mean 10–130°) amplitudes. There were two cases of transient radial paresis with spontaneous recovery. Only two patients experienced mild arm pain that did not required long-term antalgesic treatment. There were no injuries to the femorocutaneous nerve at the site of graft harvesting.

Discussion: Plate fixation for nonunion of the humerus is widely described in the literature. The main complications with this method include radial paralysis and infection. For this reason, several recent reports have advocated locked nailing or external fixation of the Ilizarov type. These methods are technically difficult and are not free of their own complications. We thus recommend screw plate fixation (eight cortical screws on either side of the nonunion) associated with cancellous bone grafts. The results in our series with almost no complications favour this option.