Cam Femoroacetabular Impingement as a Possible Explanation of Recalcitrant Anterior Knee Pain

Figure 4

Kinematic gait analysis. (a) Preoperative. (b) Postoperative (7 months of follow-up). Red line, right hip. Blue line, pathologic left hip. Blue band, band of normality. Notice how the preoperative nonpathological hip values differ from those of the postoperative ones of the same hip. This is due to the fact that in the kinematic and kinetic studies the pathological limb influences the healthy limb. What is relevant is that after surgery, the values of both hips are in the normality band. Furthermore, the external rotation of the hip that has been operated on has decreased regarding the preoperative status.

(a)

(b)