Fig. 1From: The ‘critical trochanter angle’: a predictor for stem alignment in total hip arthroplastyMeasurement of the critical trochanter angle (CTA). The angle crest (A) is defined as the intersection of the femoral shaft axis (a) and the femoral neck axis (b). A leg (c) between the angle crest (A) and trochanter vertex (B) is build, and the CTA is measured between this leg and the femoral shaft axisBack to article page