Rapid fracture healing of the greater tuberosity fragment after shoulder hemiarthroplasty in a patient with daily abaloparatide injection: A case report

We report a case of a 64-year-old woman who developed a 4-parts shoulder fracture-dislocation with peripheral nerve injury by the displaced fragment, during abaloparatide treatment. Following shoulder hemiarthroplasty, bone union at the greater tuberosity was achieved on postoperative day 16, with remodelling completed at 6 months postoperatively. This course was exceptionally favourable. Factors potentially contributing to the early bone union progression may include the coincidental administration of abaloparatide prior to trauma and the presence of peripheral nerve injury. • Radiographic union of the greater tuberosity after hemiarthroplasty was seen at postoperative day 16. • Daily abaloparatide had been administered for 3 months before the injury. • Concomitant peripheral nerve injury may have influenced callus formation. • Remodelling appeared complete by 6 months postoperatively.