A Geometric Model to Determine Patient-Specific Cup Anteversion Based on Pelvic Motion in Total Hip Arthroplasty

Figure 1

Transformations of vector normal to cup flat surface (red line) starting with (a) inclination, then (b) anteversion, and finally (c) pelvic tilt (dotted line is starting orientation and solid line is rotated orientation, with positive tilt being posterior pelvic tilt).

(a)

(b)

(c)