Fig. 1From: Rapidly progressive osteoarthritis of hip: establishing and validating diagnostic criteria in the Southeast Asian populationLeft (normal), measuring the pelvic tilt diameter, Wiberg angle, and head diameter. Middle (type 1 RPOA, loss of joint space), measuring the superior joint space. Right (type 2 RPOA, superior acetabulum and femoral head destruction), measuring the superior acetabular bone loss and final leg length discrepancyBack to article page