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bwschulz
11-26-2007, 04:09 AM
I friend of mine recently ruptured his plantaris muscle in his one leg
and subsequently started to hyperextend his knee on that side during
gait. His orthopedic surgeon dismissed the plantaris rupture as a
possible cause for this hyperextension out of hand as the plantaris is
"a vestigial structure". While the plantaris may be far smaller and
weaker in humans than in cats and non-human primates, it may be
important in proprioception, but I have not been able to find any
evidence of its utility. Does anyone know of any evidence for the
importance of plantaris proprioception in gait or any possible
mechanism, neural or mechanistic, why plantaris rupture could result in
knee hyperextension during gait?

Brian Schulz, Ph.D.
Biomechanist / Career Development Awardee
VISN 8 Patient Safety Research Center (118M)
James A. Haley Veterans' Hospital
11605 North Nebraska Ave.
Tampa, FL 33612-5738
Phone: (813) 558-3944
Fax: (813) 558-3990
www.patientsafetycenter.com