Stephen A Parada1, Matthew C Jones1, Mikalyn T DeFoor2, B Gage Griswold1, Aaron D Roberts3, Matthew T Provencher4. 1. Department of Orthopaedics, Medical College of Georgia at Augusta University Medical Center, Augusta, GA, USA. 2. School of Medicine, Medical College of Georgia at Augusta University, Augusta, GA, USA. 3. Department of Orthopaedics, Winn Army Community Hospital, Ft Stewart, GA, USA. 4. Steadman Philippon Research Institute, Vail, CO, USA.
Abstract
OBJECTIVE: Two glenoid bone loss calculations are compared across a range of anatomic glenoid sizes. METHODS: 20 cadaveric paired glenoid diameters were measured to create glenoid models with bone loss calculated in 1 mm linear increments up to 50% bone loss comparing the linear measurement percentage (LMP) to the circle line method (CLM) gold standard. RESULTS: The LMP overestimates glenoid bone loss at every potential 1 mm increment across each glenoid model until bone loss reaches 50%. CONCLUSION: The widely-used LMP method overestimates bone loss compared to a gold standard potentially misguiding surgeons towards bony reconstruction in shoulder instability during preoperative planning.
OBJECTIVE: Two glenoid bone loss calculations are compared across a range of anatomic glenoid sizes. METHODS: 20 cadaveric paired glenoid diameters were measured to create glenoid models with bone loss calculated in 1 mm linear increments up to 50% bone loss comparing the linear measurement percentage (LMP) to the circle line method (CLM) gold standard. RESULTS: The LMP overestimates glenoid bone loss at every potential 1 mm increment across each glenoid model until bone loss reaches 50%. CONCLUSION: The widely-used LMP method overestimates bone loss compared to a gold standard potentially misguiding surgeons towards bony reconstruction in shoulder instability during preoperative planning.
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