Pelvic Incidence: A Predictive Factor for Three-Dimensional Acetabular Orientation—A Preliminary Study

<table>A geometric construction by complementary angles reveals that the morphological parameter incidence is the algebraic sum of the sacral slope and the pelvic tilt: Incidence = sacral slope + pelvic tilt.</table>

Anatomy Research International

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Figure 2: Pelvic Incidence: A Predictive Factor for Three-Dimensional Acetabular Orientation—A Preliminary Study 