2Hip JointThe hip is the most proximal of the lower extremity joints. It is very important in weight-bearing and walking activities. Like the shoulder, it is a ball-and-socket joint. The rounded or convex-shaped femoral head fits into and articulates with the concave-shaped acetabulum. Unlike the shoulder, the hip is a very stable joint and therefore sacrifices some range of motion. The hip joint (a triaxial joint) has motions in all three planes.
3Motions of the Hip Flexion Extension Hyperextension Abduction AdductionLateral RotationMedial Rotation
7IliopsoasO: Iliac fossa, anterior and lateral surfaces of T12 through L5I: Lesser trochanterA: Hip flexionN: Iliacus portion: Femoral nerve (L2, L3)Psoas major portion: L2 and L3*The iliopsoas muscle is actuall two muscles: iliacus muscle and psoas major muscle*
23Gluteus Maximus O: Posterior sacrum and ilium I: Posterior femur distal to greater trochanter and to iliotibial bandA: Hip extension, hyperextension, lateral rotationN: Inferior gluteal nerve (L5, S1, S2)
47Biceps Femoris O: Long head: ischial tuberosity Short head: lateral lip of linea asperaI: Fibular headA: Long head: extend hip and flex kneeShort head: flex kneeN: Long head: Sciatic nerve (S1, S2, S3)Short head: Common peroneal nerve (L5, S1, S2)