Olerud C, Berg P
Clin Orthop Relat Res. 1984 Dec(191):162-5.
The Q angle (i.e., the angle between the rectus femoris and the patellar ligament) was measured on 34 healthy volunteers by use of three different methods: (1) a photographic method, (2) a direct method with a goniometer on erect persons, and (3) a direct method on subjects in the supine positions. The Q angle was measured with the foot in different positions with regard to inward and outward rotation and pronation and supination. It was found that the Q angle increased as the foot shifted from outward to inward rotation. The Q angle decreased as the foot shifted from pronation to supination. The reproducibility of the photographic method was good and gave basically the same values as the direct method on erect persons. However, these methods gave values different from those of the direct method on the supine person. Consequently, it is necessary to standardize the position of the foot when measuring the Q angle.
采用三种不同方法对34名健康志愿者的Q角（即股直肌与髌韧带之间的夹角）进行了测量：（1）摄影法；（2）对直立者使用测角仪的直接测量法；（3）对仰卧位受试者的直接测量法。在足部处于内旋和外旋以及旋前和旋后的不同位置时测量Q角。结果发现，随着足部从外旋向内旋移动，Q角增大。随着足部从旋前向旋后移动，Q角减小。摄影法的可重复性良好，得出的值与对直立者的直接测量法基本相同。然而，这些方法得出的值与对仰卧位者的直接测量法不同。因此，在测量Q角时，有必要规范足部的位置。
