Computed Tomography Analysis of Postsurgery Femoral Component Rotation Based on a Force Sensing Device Method versus Hypothetical Rotational Alignment Based on Anatomical Landmark Methods: A Pilot Study

Figure 1

After registration of bony landmarks, that is, most anterior trochlear groove, most distal trochlear groove, medial and lateral epicondyle, and most posterior medial and most posterior lateral point via a computer-assisted navigation system, establishing femoral rotation can be based on 90° angle from anterior-posterior midline or “Whiteside’s line” (a) or be based on anatomical transepicondylar axis (b). The conventional method uses the posterior condyles as a reference and prescribes three degrees’ rotation (c).