The psoas major muscle begins at the body of the twelfth thoracic vertebra, the bodies of the first through fifth lumbar vertebrae and the sides of the intervertebral discs, as well as the anterior and inferior margins of the transverse processes of all the lumbar vertebrae, and stops at the lesser tuberosity of the femur.
The psoas major muscle is located on both sides of the lumbar spine, one on each side, which enters the hip joint from its starting point under the inguinal ligament and stops at the femoral rotor. The proximal muscle can be contracted to make flexion and external rotation, and the distal muscle can be contracted to make the torso flexed to the same side.
Simultaneous contraction of both muscles can make the lumbar segment flex forward, providing greater strength support for hip flexion, and when damaged, it can show symptoms such as limited hip flexion and scoliosis.
The psoas major muscle is located deeper and the surface is difficult to touch, so the corresponding part of the discomfort needs to consult the doctor in time and follow the doctor’s instructions for treatment.