Article

The bony motion of the foot during the stance phase of gait is useful to further
our understanding of joint function, disease etiology, injury prevention and
surgical intervention. In this study, we used a 10-segment in vitro foot model
with anatomical coordinate systems and a robotic gait simulator (RGS) to measure
the kinematics of the tibia, talus, calcaneus, cuboid, navicular, medial
cuneiform, first metatarsal, hallux, third metatarsal, and fifth metatarsal from
six cadaveric feet. The RGS accurately reproduced in vivo vertical ground
reaction force (5.9% body weight RMS error) and tibia to ground kinematics. The
kinematic data from the foot model generally agree with invasive in vivo
descriptions of bony motion and provides the most realistic description of bony
motion currently available for an in vitro model. These data help to clarify the
function of several joints that are difficult to study in vivo; for example, the
combined range of motion of the talonavicular, naviculocuneiform,
metatarsocuneiform joints provided more sagittal plane mobility (27.4 degrees )
than the talotibial joint alone (23.2 degrees ). Additionally, the anatomical
coordinate systems made it easier to meaningfully determine bone-to-bone motion,
describing uniplanar motion as rotation about a single axis rather than about
three. The data provided in this study allow for many kinematic interpretations
to be made about dynamic foot bone motion, and the methodology presents a means
to explore many invasive foot biomechanics questions under near-physiologic
conditions.
CI - Published by Elsevier B.V.

Langue : ANGLAIS