Fig 4.

Sharp's angle measurement on a left anteroposterior hip radiograph. The acute angle measured between the projection of the horizontal teardrop line and the line connecting the teardrop to the lateral acetabulum is performed. A normal Sharp angle is between 33° and 38°. An abnormal Sharp angle is defined as an angle <32°, defined as insignificant; between 39° and 42°, defined as borderline; and final >42°, defined as dysplastic.