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Typical case in the MSSS group. (a) Two-part fracture of the surgical neck in a 60-year-old male (right). (b) Immediate postoperative AP X-ray showed the medial cortex was malreduced, the NSA was 135.1°, and only one medial support screw was used (arrow). (c) At the 6-month follow-up, a radiograph showed complete bone union but the humeral head had failed in varus with an NSA of 121.0°. MSSS: Medial single screw support group; AP: Anteroposterior; NSA: Neck-shaft angle.
