With low back pain we alwayswant to check out the psoas, QL, and diaphragm. (I also like to check the multifidus muscle :)). The psoas is an awesome muscle that arises from the bodies of T12-L5 and also the TVPs of L1-L5, and even the lumbar dis! (Be cautious when testing this muscle if patient has disc problem). The tendons attach to medial arcuate ligament of the diaphragm and sorta wrap around the diaphragm itself. If one psoas is weak, the other overcontracts and can effect the diaphragm. It's extremely important to keep these muscles balanced as they are major stabilizers of the L spine. With reactive muscles, the contracture can limit the diaphragm's potential during gait- in this case they have to be toned down. (Don't worry video coming soon). Woah I went on a tangent there! Anyway it inserts onto the lesser trochanter of the femur. In this video we found a jones type trigger point. To diagnose these using muscles testing we take a previous strong muscle and it should weaken to a three second maximal contraction. This lets us know we can dig in! We shorten the muscle to a point of least tenderness and have the patient hold their breath for 30 seconds as we treat the trigger point. Goodheart found that holding the breath on an inhale for flexors and exhale for extensors helps speeds up the process. Then we slowly return the muscle back to normal position being careful not to strain it. Will often be present in the synergist muscle of a weak one, and nutrition is folic acid(might have to be methylated).