Minimum Lateral Bone Coverage Required for Securing Fixation of Cementless Acetabular Components in Hip Dysplasia

Figure 1

The cup center-edge (cup-CE) angle and bone coverage index (BCI) were determined on postoperative anteroposterior pelvic radiographs using the interteardrop line as a reference. (a) The cup-CE angle was determined as the angle created by the intersection of a line connecting the hip center and the lateral edge of the host bone and the line perpendicular to the interteardrop line. (b) The BCI was determined as the percentage of the horizontal width of the cup covered by the host bone (distance A) in the horizontal width of the cup (distance B).

(a)

(b)