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


CONCLUSIONS
Acetabular retroversion may occur only in the affected hip or in both hips; in the latter case, the treatment outcome may be poor.
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Takashi
T
Yoshida
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Wook-Cheol
WC
Kim
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Atsushi
A
Nishida
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Yoshinobu
Y
Oka
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Toshiharu
T
Shirai
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Kazuya
K
Ikoma
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Keiichiro
K
Ueshima
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Hiroyoshi
H
Fujiwara
Department of Orthopaedics, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
Toshikazu
T
Kubo
Acetabular retroversion; Cross-over sign; Perthes disease