Ott N, Harland A, Hackl M, et al. - This study was sought to examine and compare the primary stability of the common treatment measures. Researchers conducted cemented reverse total shoulder arthroplasty (DeltaXtend, Fa. Johnson & Johnson, Norderstedt, Germany) in five shoulders, and a distal, mid-diaphysis humeral fracture (Wright and Cofield type B) was induced. They investigated specimens in a biomechanical setup simulating the activity of daily living including rotation. They applied strain gauges (4-wire-120 Ohm, Fa. Vishay) mounted on the 4.5 locking plates to assess the strain of the fixation and to give an estimate for primary stability. It was shown that additional k-wire cerclages or additional 3.5 locked plating did not increase primary stability. As per the findings, 4.5 mm locked plating is sufficient to address periprosthetic humeral shaft fractures in the present in vitro setup, with a stable prosthetic implant in place.