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Fig. 3 | Knee Surgery & Related Research

Fig. 3

From: Short knee radiographs can be inadequate for estimating TKA alignment in knees with bowing

Fig. 3

Postoperative short (14 × 17 in. grid cassette) and full-length (14 × 51 in. grid cassette) radiographs showing the measurement of anatomical femorotibial angle (aFTA) and mechanical hip–knee–ankle axis angle (mHKA)

The postoperative aFTA was measured using two lines, the first aligned from the bisection point of the femur, 15 cm above the lowermost portion of the femoral component to the deepest part of the center of the femoral component, and the second from the bisecting point of tibia 15 cm down from the uppermost portion of the tibial component [19]. Postoperative mHKA was made between the two lines, the first aligned from the center of the femoral head to the deepest part of the center of the femoral component, and the second from the midpoint of the inner extension of the tibio-talar joint to the center of the tibial component [14].

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