Easy Identification of Mechanical Axis during Total Knee Arthroplasty

초록

Purpose: We devised an intraoperatively identifiable mechanical axis (IIMA) as a reference of alignment in total knee arthroplasty (TKA). Materials and Methods: Between February 2010 and January 2011, primary TKAs were consecutively performed on 672 patients (1007 knees) using an BMA as a reference in the coronal plane. Results: The alignment of the lower extremity improved from a mean of 11.4+/-6.7 degrees (-10.3-34.4 degrees) of varus preop. to 0.7+/-3.5 degrees (-5.2-8.6 degrees) immediately after surgery. Mean alignment of the femoral component in the coronal plane was 89.3+/-2.3 degrees (83.4-97.2 degrees) postop. and mean alignment of the tibial component was 90.4+/-2.2 degrees (85.1-94.2 degrees) postop. Conclusion: This study showed that DMA could be of considerable value as a new guider of alignment that is easily accessible and highly effective during total knee arthroplasty.

키워드