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Short knee X-rays may be inaccurate for assessment of coronal alignment after TKA

May 25, 2016

A recently published study showed use of the femorotibial angle on short films led to the misclassification of a significant proportion of patients as having varus, valgus or neutral coronal alignment after total knee arthroplasty compared with the hip-knee-ankle angle.

Femorotibial angle, hip-knee-ankle angle, medial proximal tibial angle and the lateral distal femoral angle were measured in 262 patients with short and full-length standing radiographs before and after primary total knee arthroplasty (TKA). A femorotibial angle between 2.4° and 7.2° on short knee X-rays or a hip-knee-ankle angle between -3° and 3° on full-length films were considered neutral coronal alignment, according to researchers.

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