Stephen Mc. Donald - Dept of Orthopaedics, Aberdeen Royal Infirmary, Aberdeen, Scotland
Andrel Yoong - Dept of Orthopaedics, Aberdeen Royal Infirmary, Aberdeen, Scotland
Piotr Skrzypiec - Dept of Orthopaedics, Aberdeen Royal Infirmary, Aberdeen, Scotland
Alan Johnstone - Dept of Orthopaedics, Aberdeen Royal Infirmary, Aberdeen, Scotland

Objectives: To assess fracture union rates using novel intramedullary plate technique. Post-operative humeral neck-shaft angles, patient range of motion and complication profile were secondary outcomes of interest.Methods: Single surgeon, retrospective case series of surgical technique at major trauma centre in Scotland. A ۲.۰mm mini-fragment plate was secured to the humeral head to act as an intramedullary strut during fixation in complex proximal humerus fractures. Fracture union and neck-shaft angle were assessed radiologically, whilst range of motion and complication profiles were assessed clinically.Results: Twelve patients were followed up for an average of ۱۰ months post-operatively. All achieved bony union with a mean neck-shaft angle of ۱۲۸°. Mean range of motion values were ۱۰۰° forward elevation, ۸۳° abduction, ۶۰° internal rotation and ۳۷° external rotation. Four patients required further surgical intervention- two for hardware prominence, one for adhesive capsulitis and one for subsequent rotator cuff failure. There were no cases of avascular necrosis or infection.Conclusion: This novel technique addresses the established biomechanical propensity of proximal humerus fractures to fail in varus collapse and screw cut-out. This method provides an alternative to arthroplasty in the most severe proximal humerus fractures and is readily adopted via standard orthopaedic kit. Level of evidence: IV

calcar, Complex, Proximal humeral fracture, varus collapse