Med Student Medical News about Arthroplasty, Replacement, Knee

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Effect of limb rotation on radiographic alignment in total knee arthroplasties
Archives of Orthopaedic and Trauma Surgery, 11/10/09

Radtke K et al. – Limb rotation had a highly statistically significant effect on measured anatomic alignment and mechanical angles. A correlation between limb rotation, anatomic mechanical angle, mechanical angles measured at femur and tibia and the femoral component distance ratio was established. As the anatomic mechanical angle and the femoral component distance ratio change linearly in the range of 20° internal and external limb rotation, a calculation of the femoral component distance ratio could be used to re–calculate the limb rotation at the time of radiographic assessment to evaluate the evidence of a long leg radiograph.