Akira Ikegami, Yoshinobu Oka, Shoichi Yamazoe, Kenji Takahashi. Long-term Survival after Femoral Anterior Rotational Osteotomy for Late-onset Legg-Calvé-Perthes Disease: A Case Report with 27-year Follow-up?. Journal of orthopaedic case reports. 2023. 13. 7. 14-19