Position:  20-30 degrees of flexion

Moment:  Large extensor/flexion

MA:  Lower G-max, Adductor Magnus, Hamstrings (reduced)

FS:  Prevent excessive hip flexion to provide stability at hip, trunk and knee.  Hamstrings are reduced to help with hip extension but not cause knee flexion

Position:  20 degrees flexion

Moment:  Extensor/flexion and Abductor/adduction

MA:  Lower G-max, Adductor Magnus and Hamstrings.  Post TFL, G-min, G-med, upper G-max

FS:  Keep trunk erect and control hip flexion moment.  Stabilize the pelvis and prevent excessive drop of opposite pelvis

Position:  0 degrees

Moment:  Abductor/adduction

MA:  No muscel for sagittal plane.  Post TFL, G-min, G-med, upper G-max

FS:  Stabilization of pelvis in frontal plane, Prevent excessive drop of opposite pelvis

Position:  20 degrees hyperextension

Moment:  Flexor/extension.  Abductor/adduction

MA:  TFL, Adductor Longus

FS:  Restrain extending hip, Low level control of frontal plane pelvis movement.

Position:  10 degrees hyperextension

Moment:  Flexor/extension that decreases with unweighting

MA:  Adductor Longus and gracilis, Rectus Femoris

FS:  Decelerate the extending hip, initiate hip flexion, hip flexion contributes to knee flexion, rectus may control knee flexion

Position:  15 degrees of flexion

Moment:  flexor/extension secondary to tibial inertia

MA:  Iliacus, Adductor Longus, Sartorius, Gracilis

FS:  Hip flexion. Move limb towards midline (AL). Facilitate knee flexion as discussed previously.

Position:  25 degrees Flexion

Moment:  Extensor/Flexion due to rapidly advancing tibia

MA:  Hamstrings

FS:  Decelerate thigh advancement

Position:  20-30 degrees flexion

Moment:  Hip flexion moment decreases by the end of terminal swing

MA:  Hamstrings, lower and upper G-max, Adductor Mag, G-med, TFL

FS:  Decelerate the flexing hip and extending knee.  Prepare limb for stabilizing leg in sagittal and frontal planes at initial contact