Selection of Optimal Augment Size for Various Degrees of Glenohumeral Osteoarthritis

BackgroundTotal shoulder arthroplasty is technically demanding in regards to implantation of the glenoid component, especially in the setting of increased glenoid deformity and posterior glenoid wear. Augmented glenoid implants are an important and innovative option; however, there is little evidence accessible to surgeons to guide in the selection of the appropriate size augmented glenoid.MethodsSolid computer models of a commercially available augmented glenoid components (+3, +5, +7) contained within the software allowed for placement of the best fit glenoid component within the 3D reconstruct of each patient's scapula. Peg perforation, amount of bone reamed and amount of medialization were recorded for each augment size.ResultsThere was strong correlation between the medialization of the joint line and the glenoid retroversion for each augmented component (R2 of 0.785 for the +3 augment, an R2 of 0.792 for the +5 component, and an R2 of 0.701 for the +7 component). The range of retroversion that resto...