2004 : 3D foot kinematics from plantar pressure
by Chris Kirtley, The
Catholic University of America, Washington DC
of foot kinematics has proven to be one of the greatest challenges in gait
analysis (Wright et al, 1964; Scott and Winter, 1991 & 1993). Until
now, most laboratories only measure sagittal motion (doris/plantarflexion),
with a few routinely reporting frontal plane (inversion/eversion) kinematics.
Recently, with advances in digital camera technology, there has been some
success with tracking markers attached to the skin over the many small
foot bones (Kidder et al, 1996; Liu et al, 1997; Leardini et al, 1999;
Carson et al, 2000; Theologis et al, 2003), or using small clusters (Jenkyn,
2002). However, there are still many problems to be solved, such as skin-bone
motion artifact and identifiction of bony landmarks. The talus, for example,
is impossible to track with surface markers (Taioli, 1997)
interesting alternative approach has recently been described based on plantar
pressure data (Hagman, 2001). The contact point of the calcaneus is modeled
as a rigid sphere rolling over a flat rigid surface. From the pressure
distribution, centre of pressure (CoP) and local radius of curvature of
the calcaneus are estimated. From the change in radius, the angular velocity
of the calcaneus is calculated, and thence the inversion/eversion angle:
Email your answers to [n/a]
Do you think this procedure is valid as a measure of hindfoot
What are its limitations?
Does your laboratory currently use a multi-segment foot model?
If so, which one?
we said on the CGA list
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; RANA 2002/07)
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