Gravity Drive - Left Foot
Left foot is pronating at Midstance due to the pull of gravity on the structurally unstable foot.
Gravity Drive Mechanics
Abnormal Foot Motion - More Correctly referred to as Gravity Drive. This motion is observed in the Rothbarts Foot and PreClinical Clubfoot Deformity
Hip Drive Mechanics
Hip Drive - Right Foot
Right foot is supinating at Midstance due to the rotation of the ipsilateral hip.
Normal Foot Motion - More Correctly referred to as Hip Drive. This motion is observed in the Plantargrade Foot.
Discussion Above Animation
Zitzlesperger S 1960.The mechanics of the foot based on the concept of the skeleton as a statically indetermined space framework. Clinical Orthopedics, 16:47-63
Rothbart BA 1973. Part I. Biomechanical analysis of a normal gait pattern. Journal Canadian Podiatry Association, (3):3-7.
Rothbart BA 1973. Part II. Biomechanical analysis of a normal gait pattern. Journal Canadian Podiatry Association, (4):1-12.
Hip Drive - Observed in the Plantargrade Foot
Gravity Drive - Observed in Rothbarts Foot or
The Preclinical Clubfoot Deformity