Relationship between Tibial Baseplate Design and Rotational Alignment Landmarks in Primary Total Knee Arthroplasty

Figure 6

Left knee. Tibial component (Persona, The Personalized Knee System, Zimmer, Warsaw, USA) computed tomography (CT) axial view. Two angles were measured: (1) PCA (posterior condyles angle): angle between the projected surgical transepicondylar axis (sTEA) and the line of the posterior condyles (0.99°); (2) the angle between the projected sTEA and the mediolateral axis of the tibial component (3.52°). The mediolateral axis of the tibial baseplate has been identified through its “dwell points.” This tibial baseplate is externally rotated by 3.52° with respect to the projected femoral transepicondylar axis (sTEA).