Population-based prevalence of multiple radiographically-defined hip morphologies: the Johnston County Osteoarthritis Project R. Raveendran, J.L. Stiller,

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Population-based prevalence of multiple radiographically-defined hip morphologies: the Johnston County Osteoarthritis Project R. Raveendran, J.L. Stiller, C. Alvarez, J.B. Renner, T.A. Schwartz, N.K. Arden, J.M. Jordan, A.E. Nelson Osteoarthritis and Cartilage Volume 26, Issue 1, Pages 54-61 (January 2018) DOI: 10.1016/j.joca.2017.10.002 Copyright © 2017 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Flowchart of participants and hips included in the analysis. Osteoarthritis and Cartilage 2018 26, 54-61DOI: (10.1016/j.joca.2017.10.002) Copyright © 2017 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Assessment of hip morphologies in HipMorf. A) AP Alpha angle. Point 1 is the center of the congruent circle placed over the femoral head. Point 2 is placed on the superior cortex of the femoral neck as it passes out of the circle placed over the femoral head. AP Alpha angle is marked as the angle between the femoral neck axis and the line joining Point 1 and Point 2. B) Triangular index. A line is drawn along the midline of the femoral neck axis. A distance equating to ½ the radius of the femoral head is measured (mm) along this axis from the femoral head center, at which point a line is drawn at a perpendicular angle to this axis and which extends to the outer cortex of the femoral head. This line represents the triangular index as a binary outcome; present if R > r +2 mm, absent if R < r +2 mm. C) LCEA. A vertical axis is drawn perpendicular to the inter-teardrop line. The lateral centre edge angle is measured between this vertical axis and a line drawn between the femoral head centre (point 3) and the lateral edge of the sourcil (point 4). This line was drawn to the native sourcil, excluding any osteophytes or overgrowth that may have been present. D) Protrusio acetabuli. The medial margin of the femoral head touches or overlaps the ilioischial line. Osteoarthritis and Cartilage 2018 26, 54-61DOI: (10.1016/j.joca.2017.10.002) Copyright © 2017 Osteoarthritis Research Society International Terms and Conditions