Due to the popularity of the very short edited video of our fresh-frozen cadaver experiments at Penn State Biomechanics Lab on September 25, 2004, the full, unedited video of Drs. Kevin Kirby, Greg Lewis and Stephen Piazza testing methods of determination of subtalar joint axis spatial location is included here. The retroreflective marker sets are attached to the tibia, talus and calcaneus by pins that have been drilled into these bones. The five camera motion analysis system is then able to determine the true 3D location of the subtalar joint axis at each point within the range of motion of the talo-calcaneal joint to see how closely our clinical methods of subtalar joint axis determination correlate to the true subtalar joint axis location. Note how dorsiflexion loading force on the plantar forefoot is able to stabilize the talus relative to the tibia. By stabilizing the talus relative to the tibia, researchers should be able to use calcaneal to tibial motion as a method to determine the 3D location of the subtalar joint axis without also needing to determine the position and/or motions of the talus.
Posted on: Fri, 17 Oct 2014 04:20:50 +0000
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