Objective To observe the effects of concentric reduction and acetabular development after the treatment of the DDH for the prediction of acetabular development.
目的观察发育性髋关节发育不良（DDH） 治疗后股骨头同心复位、髋臼发育的情况，预测髋臼的发育。
2
Its root tuber has multilayer concentric circularity similar to "annual ring lines" at the initial stages of development, and grows and enriches at the same year.