• Yonsei medical journal · Nov 2013

    Easy identification of mechanical axis during total knee arthroplasty.

    • Jai-Gon Seo, Young-Wan Moon, Sang-Min Kim, Byung-Chul Jo, and Sang-Hoon Park.
    • Department of Orthopaedic Surgery, National Health Insurance Service Ilsan Hospital, 100 Ilsan-ro, Ilsandong-gu, Goyang 410-719, Korea. orthomania@gmail.com.
    • Yonsei Med. J. 2013 Nov 1; 54 (6): 150515101505-10.

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

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