Fig. 1A–H.

Examples of the radiographs of two patients with symptomatic hip dysplasia with a spherical femoral head and without radiologic signs of degeneration or OA are shown. (A) The patient’s preoperative radiograph is shown. The patient’s postoperative results after (B) 1, (C) 19, and (D) 25 years show no progression of OA. (E) The preoperative radiograph for the second patient is shown. The patient’s postoperative results after (F) 1, (G) 15, and (H) 25 years show a marked increase in OA between 15 and 25 years.