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We often find Iliopsoas trigger points in women with a history of chronic pelvic pain. A trigger point: a hyper-irritable area of the muscular tissue. According to Simons et. al. (1999), a trigger point is associated with a hypersensitive nodule of tissue . When this muscle area is compressed, it is locally tender and can give rise to referred pain. In addition, compression of the trigger point may produce referred tenderness as well as an autonomic phenomena. Trigger points are generally the result of the muscle being overloaded following an acute, prolonged, or repetitive incident. Travell and Simons discuss these trigger points in their book Myofascial Pain and Dysfunction The Trigger Point manual Vol 2.

The woman with Iliopsoas trigger points may experience lower quadrant pain, low back pain with symptoms radiating slightly into the superior gluteal region, or they may report symptoms of the anterior thigh. Functional symptoms may include the report of increased pain of these regions with prolonged sitting and/or standing. She may report increased discomfort when attempting to perform sit-ups or when jogging. Functionally, these trigger points can be activated with any type of weight bearing activities. She will report a reduction of her symptoms when lying down.

The Psoas Major portion of the muscle originates from the lumbar vertebrae while its insertion is at the Lesser Trochanter. The Iliacus portion of the muscle originates from the upper two thirds of the Iliac Fossa and then joins the Psoas and inserts at the Lesser Trochanter. The primary action of the Iliopsoas is to flex the thigh at the hip. It also plays a role in the stabilization of the spine during standing. The Psoas is especially active during sitting. Active trigger point restricts the muscle from fully lengthening and weakness develops in the muscle. Abdominal weakness is also often present in conjunction with Iliopsoas trigger points. Retraining of abdominal muscles becomes crucial in achieving the proper musculoskeletal balance and eliminating recurrent Iliopsoas trigger points.

Examination for this trigger point is critical in the treatment of CPP. Palpation for this trigger point occurs at three places:

1. Palpation occurs along the lateral border of the Rectus Abdominus and below the Rectus deeply and medially to assess for tenderness of the Psoas against the lumbar spine placement.
2. Palpate along the inner border of the Ileum behind the ASIS to locate the trigger points of the Iliacus.
3. Palpate deeply at the Lesser Trochanter along the lateral border of the femoral triangle to assess for the distal trigger point of the Iliopsoas.

Postural observations include an anteriorally tilted Pelvis, a hyper Lordosis as well as a positive Thomas Test. We often find these trigger points in women with a history of low back or abdominal surgery, a history of postural deviations including women with LB, or with Sacroiliac dysfunctions. Decreased abdominal strength/lumbar stabilization is also present in these women.

Physical Therapists can initiate treatment of this muscle through the use of myofascial release techniques, trigger point work, the use of spray 'n stretch, moist heat, and instruction in a home exercise program . The home program consists of regular stretching as well as the use of heat and cold . Visceral work may also play a role in the deactivation of this muscle. It is extremely important to educate the woman in activities she can avoid to prevent Iliopsoas activation. Functional recommendations include limiting prolonged sitting, sitting in a slightly reclined position, standing symmetrically, limiting the amount of weight bearing activities, and avoiding performing sit-ups.

If trigger points persist, further assessment may include evaluation for Rectus Abdominus, internal/external obliques, and quadratus lumborum trigger points. Unequal leg length may also contribute to the perpetuation of this trigger point. A complete assessment of muscle imbalance is also necessary.

Click here for part 2 of The Iliopsoas Trigger Point