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STJ axis variation makes it into mainstream biomechanics literature

Discussion in 'Biomechanics, Sports and Foot orthoses' started by admin, Jul 27, 2005.

  1. admin

    admin Administrator Staff Member


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    JOURNAL OF APPLIED BIOMECHANICS, 2005, 21, 85-95

    Frontal Plane Moments Do Not Accurately Reflect Ankle Dynamics During Running
    Kristian M. O’Connor and Joseph Hamill

    I am going to take a risk and attach the full PDF verson of the paper to this message - I will delete it soon...
     

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  2. Kevin Kirby

    Kevin Kirby Well-Known Member

    Thanks for the paper, Craig. Sure would have been nice if O'Connor and Hamill had looked into the podiatric literature for our published papers on the significance of STJ axis location on the kinetics of the foot.
     
  3. efuller

    efuller Well-Known Member

    I think this points to another of Mert Root's brilliant observations. You just can't do research on all feet, because they do not all behave the same. I'm not sure I like the Root classification system as a way to separate feet out for research. Position of the axis is a good way to separate feet for the effects of intervention.
     
  4. NewsBot

    NewsBot The Admin that posts the news.

    Subtalar joint axis

    Determination of subtalar joint axis location by restriction of talocrural joint motion.
    Gait Posture. 2006 Jan 30; [Epub ahead of print]
    Lewis GS, Kirby KA, Piazza SJ.
     
  5. Kevin Kirby

    Kevin Kirby Well-Known Member

    Here's a photo from our experimental setup for this project that we did a few summers ago at the Penn State Biomechanics Lab. Cool stuff!

    Next planned project is to put live subjects into an MRI to track the talus during foot motion with a specially constructed device that maintains constant ankle joint moments throughout the range of motion of the STJ. Hopefully, in a few years we will be able to track the 3D location of the STJ axis in live subjects during gait on a force plate to come up with a relatively accurate assessments of STJ moments during gait. Then we will really start to understand the kinetics of the foot!!
     
  6. Kevin Kirby

    Kevin Kirby Well-Known Member

    Experimental Setup

    Here's another photo of the cadaver setup in our experiment at Penn State Biomechanics Lab. The foot has three sets of retroreflective markers attached screwed/bolted to tibia, calcaneus and talus along with three motion analysis cameras to track 3D motions of calcaneus and talus relative to the tibia. This allowed us to determine STJ axis spatial location and to determine whether STJ axis location could be determined by calcaneal to tibial motion instead of by the standard calcaneal to talar motion.
     
  7. Cameron

    Cameron Well-Known Member

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