Kinematic Analysis of Healthy Hips during Weight-Bearing Activities by 3D-to-2D Model-to-Image Registration Technique

Figure 3

The world coordinate systems and the coordinate systems of the pelvis and femur were based on the projected plane of a flat panel X-ray detector (a), the anterior pelvic plane ((b) and (c)), and the center of the femoral head and the transepicondylar axis (d), respectively. The relative positions and orientations of the pelvis and femur for the world coordinate systems were defined as pelvic and femoral movements, respectively. The relative femoral positions and orientations for the pelvis were defined as hip movements ((e) and (f)).

(a)

(b)

(c)

(d)

(e)

(f)