Fig. 2

Plain radiographic measurements to evaluate the hip joint deformities. a The femoral neck-shaft angle is determined by measuring the angle created by a line in the central axis of femoral shaft and a second line created by the connection of the femoral head center to the mid portion of the femoral head and neck junction contour. b Sharp’s angle is determined by measuring the angle created by a line connecting the acetabular tear drops and a second line connecting a tear drop and the sourcil end. c The center-edge angle is determined by measuring the angle created by a line connecting the vertical line to the tear drop line through the center of the femoral head and a second line from the center of the hip to the lateral acetabular wall margin