Internal Fixation of Proximal Humerus Fractures Using the Screw-Tension Band Technique

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Abstract

Summary:

Many of the current techniques of internal fixation of proximal humerus fractures use tension band wires to achieve secure fixation, allowing immediate postoperative exercise of the affected limb. In addition, the use of a cancellous lag screw placed from the humeral shaft into the humeral head may have several advantages. In particular, this lag screw does not violate the subacromial space and provides initial stability between the head and shaft, which facilitates placement of the tension band wires. This technique was used in 13 patients whose average age was 71 years (range 54-86). Follow-up averaged 20 months. Eight patients had two-part fractures and five patients had three-part fractures. This technique used a deltopectoral approach with manual impaction of the humeral head and shaft. A 6.5-mm AO screw was used for lag screw fixation in addition to two 18-gauge tension band wires: one placed through the tuberosities and one under the rotator cuff tendons. Passive range of motion of the involved shoulder was begun within the first postoperative week, and active range of motion and strengthening were allowed after the fourth postoperative week. At follow-up patients were evaluated for range of motion, function, pain, and radiographic appearance of the fracture. Average forward flexion was 160°, external rotation was 46°, and internal rotation was to the 10th thoracic vertebra. According to the functional scale proposed by Hawkins, 10 of the 13 patients had achieved a good result. Two of the remaining patients had a fair score, and one had a poor outcome. Five of the 13 patients reported occasional, mild pain. Radiographically there was one instance of slight varus settling. There were no instances of avascular necrosis. In one patient, one tension band wire had broken; however, revision was not necessary. Tension band wiring combined with lag screw fixation afforded sufficient fracture stability to allow early, aggressive rehabilitation in this elderly patient cohort. As a method of internal fixation, this technique may have particular advantages in elderly osteoporotic patients.

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