Mechanical axis cannot be restored in total knee arthroplasty with a fixed valgus resection angle - A radiographic study

被引:60
作者
Bardakos, Nicholas
Cil, Akin
Thompson, Brandon
Stocks, Greg
机构
[1] Methodist Hosp, Baylor Coll Med, Joint Replacement Ctr, Dept Orthopaed Surg, Houston, TX USA
[2] Fondren Orthopaed grp, Joint Implant Sect, Houston, TX USA
关键词
long-leg radiographs; alignment total knee arthroplasty; mechanical axis TKA; distal femoral resection angle; total knee arthroplasty; alignment radiographs;
D O I
10.1016/j.arth.2007.04.018
中图分类号
R826.8 [整形外科学]; R782.2 [口腔颌面部整形外科学]; R726.2 [小儿整形外科学]; R62 [整形外科学(修复外科学)];
学科分类号
摘要
Alignment radiographs of 174 extremities in patients undergoing total knee arthroplasty were measured to determine the variability in valgus cut angle (VCA) and the anatomical factors that affect the VCA necessary to restore the mechanical axis. The VCA averaged 5.6 degrees +/- 1.0 degrees with a range of 2 degrees to 9 degrees. With the 3 different methods of defining the anatomical axis of the femur, 30% to 51% of patients required a VCA of less than 5 degrees or greater than 6 degrees. The offset and neck-shaft angle of the ipsilateral hip exert a strong effect on the VCA necessary to restore the mechanical axis. Patients with coxa valga or reduced hip offset generally require a VCA less than 5 degrees. Patients with coxa vara or increased hip offset generally require a VCA greater than 6 degrees.
引用
收藏
页码:85 / 89
页数:5
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