The humeral head osteotomy influences shoulder arthroplasty component height, version and neck shaft angle and therefore outcomes. The purpose of this study is to develop and utilize navigation to execute the osteotomy.

3D printed models were used to develop a navigation technique, and then to execute planned osteotomies. Free hand, fixed angle guide, patient specific guides, and real time navigation osteotomies were completed. The height, neck shaft angle and version were recorded. Also collected, were the planes of the guides once they were placed.

Navigation had significantly less error from the planned osteotomy in neck shaft angle versus all other groups and for version compared to free hand and fixed angle guides. Patient specific guides had statistically less error from planned neck shaft compared to the fixed angle guides. There were no statistical differences in cut height across groups. There was no difference in planned, guide placement and completed osteotomy parameters.