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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Intraoperative measurements of femoral anterior tangent (FAT) line for determining the rotational alignment of femoral component of total knee arthroplasty.
Journal of Arthroplasty 2013 December
Previously, we reported using CT images that the anterior surface of the femur immediately proximal to the trochlea and its tangent line (femoral anterior tangent line; FAT line) could be used as a good index of the femoral rotation. In this study, we developed a jig that allowed us to measure the FAT line during surgery, and we examine the relation between preoperative and intraoperative measurement values. The results indicated that the average intraoperative measurement value of the 'surgical' FAT line was 9.8° ± 3.2° internally rotated using surgical transepicondylar axis reference. This value significantly correlated to preoperative FAT line/clinical transepicondylar axis angle. These findings demonstrated that FAT line is a useful index for appropriate rotational alignment of femoral component, both before and during TKA.
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