View Full Version : Skeletal transients and shock absorption

Brian Glaister
07-06-2004, 06:49 AM
Hello all,

I'm performing a study comparing different aspects of prosthetic feet in
transfemoral amputees. One of these aspects is the shock-absorbing
capabilities of the feet. From what I can tell, there are two ways of
measuring shock absorbance. One looks at ground reaction forces, though from
what I can tell this method is highly dependent on the geometry of impact and
if the subject does not strike the force plate with the heel, the data is
skewed. The second method investigates the skeletal transients of the tibia
through the use of accelerometers either mounted to the skin or bone. Some
researchers (Light et al., Lafortune et al.) look at peak accelerations at
heel strike. Others (G.R. Johnson) use what is called a shock factor that
investigates the acceleration over a wide range of frequencies. Does anyone
have any opinions as to which method is better? I'd also enjoy seeing a
comparison to the two methods with bone-mounted accelerometers if one is
available. Thanks in advance. I'll post a summary of the replies.

Brian Glaister
Research Assistance
The Center for Rehabilitation Neuroscience and Rehabilitation Engineering
The Biodesign Institute at Arizona State University

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