2 Hip 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.
3 Motions of the Hip Flexion Extension Hyperextension Abduction AdductionLateral RotationMedial Rotation
7 IliopsoasO: 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*
23 Gluteus 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)
47 Biceps 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)