We present a case of a 30-year-old man with proximal humerus osteosarcoma and periarticular soft-tissue involvement. Severe humeral and glenoid bone loss was observed, with nonfunctional deltoid after limb-sparing resection and a failed attempt of stabilization. The shoulder was reconstructed using a reverse allograft-prosthesis composite, with deltoid reconstruction by pectoralis major transfer.
To the best of our knowledge, this is the first time that this reconstruction technique has been reported in an oncological patient. Favorable clinical and radiological results were achieved at the 24-month follow-up.