If there is lumbar disorder, the left ilium always fixes in the AS mode. The hip joint proper will develop strain because the SI joint no longer assists in hip flexion. Hip popping or clicking may result. Strain in the gluteal muscles due to over-stretching will develop. Reactive stress on the hip flexor muscles will develop lumbar extension and can contract and strain.
Proper analysis depends upon proper static and motion palpation procedures.
There is a sidedness observed. The fifth lumbar is the usual primary difficulty. It will misalign and fixate in the LP position mainly, or it may develop degenerative inflammatory disorders. Other lumbars may be involved also. As described, the hip and groin will develop stress and possible symptoms.