Successful placement of elbow arthroplasty components is dependent on the accurate identification of the flexion-extension (FE) axis, generally defined by the geometric centers of the capitellum and trochlea [1,2]. Brownhill et al.  showed that a visual estimation of the FE axis, a technique described by Morrey and Hotchkiss , can result in significant errors, even with preserved bone architecture.
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The Use of Surface-Based Registration to Facilitate Total Elbow Arthroplasty in the Absence of Key Anatomical Landmarks
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McDonald, CP, King, GJ, Peters, TM, & Johnson, JA. "The Use of Surface-Based Registration to Facilitate Total Elbow Arthroplasty in the Absence of Key Anatomical Landmarks." Proceedings of the ASME 2008 Summer Bioengineering Conference. ASME 2008 Summer Bioengineering Conference, Parts A and B. Marco Island, Florida, USA. June 25–29, 2008. pp. 695-696. ASME. https://doi.org/10.1115/SBC2008-193183
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