Conclusion: Both the asymmetry between right and left psoasmuscles and the amyotrophy or attenuation of the psoas muscle are probably the anatomical factors which lead to lumbar disc herniation.
结论：双侧腰大肌不对称及腰大肌萎缩变细可能均是腰椎间盘突出的解剖因素之一。
2
If those surrounding muscles get tight and pull the pelvis put of place, this can put unnecessary stress on the psoas and impede it's function.
如果周围的肌肉变紧，使得骨盆错位，这样腰肌就会承受不必要的压力，功能受阻。
3
The principal muscles involved in hip flexion are the psoas and the iliacus, collectively known as the iliopsoas.