CHAPTER 11 Structure and Function of the Hip Complex Sagittal Plane Flexion (Anterior pelvic tilt)
Slack Iliofemoral ligament
30° 15° Extension (Posterior pelvic tilt)
Iliofemoral ligament
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A Frontal Plane Abduction
Intertransverse ligament
30° 25° Adduction
Intertransverse ligament
B Horizontal Plane Internal rotation External rotation
15° 15° C Figure 11.17 Pelvis-on-femur motion in the sagittal plane (A), the frontal plane (B), and the horizontal plane (C).
The psoas major muscle attaches proximally to the bodies and transverse processes as well as vertebral bodies and intervertebral discs of T12 and L1-L4 vertebrae. It blends distally with the iliacus tendon and attaches to the lesser trochanter of the femur. The psoas muscle plays a role as a spine stabilizer as it crosses the lumbar spine, the
lumbosacral joint, the sacroiliac joint, and the hip joint. The psoas muscle can become tight, either from being in a shortened position for an extended period of time, such as when a person maintains a prolonged sitting position, or if hip extensors are much weaker than hip fl exors. Tightness of the psoas muscle can alter the position of the
