[Proximal 4-part humerus fractures treated by antegrade nailing with self-stabilizing screws: 31 cases]

We present results of an internal fixation procedure for 4-part fractures of the upper part of the humerus with or without impaction.

Antegrade nailing with self-stabilizing screws, by Telegraph nail, was used in 31 patients treated between June 1998 and June 1999. The standard insertion technique or the cup-and-ball method were used for nail insertion depending on the type of fracture (Neer and Duparc classification), the cup-and-ball method allowing fixation of more complex fractures. Clinical and radiological data were available for 23 patients at a mean follow-up of two years. Functional outcome was assessed with the Constant score.

At last follow-up, the rough Constant score was 63 and the age- and sex-balanced Constant score was 85. Mean antepulsion was 130 degrees. Outcome was significantly better for Duparc type 2 cephalotuberosity fractures (scapula valga) where the weighted Constant score was 93. There were two cases of necrosis.

Complex fractures of the upper part of the humerus are a major therapeutic challenge. To date, there is no agreement on the most appropriate osteosynthesis method and the results of shoulder prosthesis after trauma remain controversial. The Telegraph nail appears to be a simple and reproducible method of achieving reduction, stability, and early mobilization. Functional outcome has been favorable for type 2 cephalotuberosity fractures and only two cases of necrosis were observed in this series in patients with type 3 and 4 cephalotuberosity fractures. These good results are related to the self-stabilizing effect of the locking screws which allow a stable fixation and revascularization of the bony fragments by creeping substitution. This new system is an attractive alternative to shoulder prostheses in trauma victims with complex displaced fractures without impaction. The surgical technique remains difficult. It would appear reasonable to expect remarkable and reproducible results for impacted fractures.