The landmarks used for tibial component rotation in total knee arthroplasty (TKA) and medial unicompartmental knee arthroplasty (UKA) may differ, utilizing the medial edge of the tibial tubercle and the medial edge of the tibial spine, respectively. However, some surgeons reference from the medial edge of the tibial tubercle in UKA. Use of the tibial tubercle to determine orientation of the sagittal cut in medial UKA can result in external rotation of the tibial component, leading to rotational mismatch between the femoral and tibial components, potential disruption of the ACL and tibial component undersizing. The purpose of this study was to define the angular differences that would result when using the tibial spine versus the medial edge of the tibial tubercle for determining tibial component rotation in medial UKA.
Recommended CitationKerr, MD, Glenn J.; O'Toole, MD, Patrick; Wu, DO, Eddie; and Lonner, MD, Jess H., "Rotational Alignment in Medial Unicompartmental Knee Arthroplasty: Comparison of Anatomic Landmarks" (2015). Rothman Institute Conference Posters. Paper 14.