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。

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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.

块根在发育的初期具有类似“年轮纹路”的多层同心圆结构，当年产生，当年充实。

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