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Anteroposterior radiograph of a left hip showing a Tönnis angle measurement where a horizontal teardrop-to-teardrop line has been drawn and a line tangential to the weight-bearing dome of the acetabulum depicts the Tönnis angle. The reference range for normal Tönnis angle is −10° to 10°. A Tönnis angle >10° is indicative of acetabular dysplasia, and a Tönnis angle ≤10° is indicative of a pincer lesion.
