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Objectives  A retrospective study was conducted using magnetic resonance image (MRI) and a full‐length standing scanogram (FLSS) to measure the quadriceps angle (Q‐angle) while avoiding soft tissue interference.    Methods  Two steps were retrospectively carried out in two case series. The first step involved using MRI to define the standardized patellar center (PC) and the tibial tubercle (TT) on the frontal plane of the MRI in one group of 60 consecutive patients (from July 2016 to December 2016, 29 men and 31 women, average of 46 years). The next step was transferring the location of the standardized PC and the TT from the MRI to the FLSS in another group of 100 consecutive patients (from April 2009 to March 2014, 50 men and 50 women, average of 36 years). The pelvis and intact femur, knee, and tibia were used to determine the Q‐angle on the FLSS.    Results  The standardized PC was positioned 42% from the lateral end of femur trans‐epicondylar line. The TT was 2 cm distal to the tibial articular surface and 37% from the lateral end of tibial width. The average Q‐angle was 9.5° in 100 patients (8.8° in 50 men and 10.1° in 50 women,  P  = 0.02). The average femoral length was 42.9 cm in 100 patients (44.7 cm in 50 men and 41.1 cm in 50 women,  P  < 0.001). Women and men had similar pelvic width (27.9  vs  27.8 cm,  P  = 0.89).    Conclusion  Using the FLSS may help to accurately determine the Q‐angle. Men and women have similar pelvic width. A larger Q‐angle in women may be mainly due to the shorter femur.

Imaging Approaches for Accurate Determination of the Quadriceps Angle