Posterior hip joint stiffness, whether it be capsular or muscular, and poor glute function will cause the femoral head to glide forward causing a pinching of the capsule in the joint as it flexes. It also can result in bursitis/tendonitis/tendonosis anteriorly which results in persistant pain in a variety of postures. It's referred to either anterior hip impingement or anterior femoral glide syndrome depending on the source you read.
Do a search and there should be a "fix" somewhere on the net. it's basically a matter of improving posterior glide of the femoral head. Stretching the hip flexor is a no-no as it will just perpetuate the problem.
Bill
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