Acetabular anteversion angle from early stage of Perthes disease to adolescence.

Abstract Objective This study aimed to assess acetabular anteversion angle (AAA) from the early stage of Perthes disease to adolescence. Methods Twenty-five patients treated conservatively were examined. Changes in AAA from initial to final measurement were compared between the two groups (G-group: Stulberg classes I and II; P-group: classes III and IV). Results In the G-group, AAA decreased significantly in the affected hip compared with the unaffected hip, whereas AAA decreased in both hips in the P-group. Conclusion Acetabular retroversion may occur only in the affected hip or in both hips; in the latter case, the treatment outcome may be poor.