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Mike Pohl
02-18-2004, 10:07 PM
Dear Colleagues,

Iím currently attempting to investigate the coupling relationship between the
rearfoot and tibia and have been given an opportunity to participate in a
cadaver study. The investigation will use an Instron 8500 to apply vertical
loading to the specimens (simulating mid-stance), using clamps and weights to
secure the tendons crossing the ankle complex. The main problem is deciding
what loads to use on the tendons. Also how to load them i.e. can some tendons
be clamped together for simplification?

I have searched the literature and found that the most common method is to:
1) first express the maximum contractile force of each muscle relative to a
selected muscle (i.e. triceps surae) based on the relative physiological cross-
sectional areas (PCSA).
2) then express the tension of each muscle as a percentage of its activation
in the gait cycle using EMG data (Perry, Gait Analysis).

In order to implement this method, however, I still need to know the maximum
contractile force of one muscle to start with in order to reference the other
muscle forces relative to! Nyska et al. (2001) used the PCSA of the tibialis
anterior multiplied by 3.6 (this is defined as the tension-producing
capability of the muscle). However, this method required the removal of the
muscle from the specimen. Sharkey and Hamel (1998) used a dynamic gait
simulator to determine the loading required in the triceps surae but this
required the simulation to be performed, which brings me back to the original
problem!

Can anyone suggest how I should address this problem? Is there a reasonably
simple solution? Any help and advice on this matter would be greatly
appreciated.

Mike Pohl.

--
Institute of Sport and Exercise Sciences
University of Leeds
LS2 9JT
++44 (0)113 2331669

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