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Cross-sectional view of ceramic-on-ceramic total hip joint replacement, consisting of an acetabular cup with an inclination angle of 45°, a femoral head and a titanium backing shell. An edge is formed at the cup rim (point A) and located at 77° relative to the pole of the cup (a). The details of the cup rim with the edge, including a straight line segment (AD) and a circular segment (DC) (b).
