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. [3] showed that a visual estimation of the FE axis, a technique described by Morrey and Hotchkiss [1], can result in significant errors, even with preserved bone architecture.

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