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Measurement of Tonni's angle (T) and Centre edge angle (ce) on T1VIBE inversion. Tonni's angle is between a (line joining the medial edge of sourcil and outer edge of the acetabulum) and b (horizontal line parallel to trans ischial line. Centre edge angle is angle between c (line from centre of femoral head to the outer edge of the acetabulum) and d (line from centre of the of femoral head and perpendicular to the trans ischial line).
