Objective: To investigate the relationship of musculuspsoasmajor role and the formation of lumbar curvature.
目的：探讨腰大肌的作用及其与人类腰曲形成的关系。
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Walking brought along the lumbar vertebra to bend forward and rotate with the movement of right and left lower limbs. The main force to finish this movement came mainly from musculuspsoasmajor.