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Rotational Equilibrium Axis Determination:does exist a video tutorial?

Discussion in 'Biomechanics, Sports and Foot orthoses' started by fabio.alberzoni, Feb 17, 2014.

  1. fabio.alberzoni

    fabio.alberzoni Active Member

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    Exist a video tutorial on the web? Someone could publicate it?

  2. subtalar joint axis locator

    great video for visual.

    But what exactly do you mean?

    the axis (bundle of ) is the imaginary point which represents, where forces are equal and opposite during motion.

    kevin has posted many of his pdfs on STJ axis have you read those?
  3. efuller

    efuller MVP

    Have you read Kevin's paper?

    Methods for determination of positional variations in the subtalar joint axis.

    Kirby KA. J Am Podiatr Med Assoc. 1987 May;77(5):228-34

    The directions there are pretty clear. There are a couple of things that I might add to the paper, but reading the paper will give you the basics.

  4. Lab Guy

    Lab Guy Well-Known Member

    Kevin, where did you find the parts to build your STJ axis locator such as the frame, small suction cups and plastic brackets? Thanks.

  5. I built it. They were bits I had lying around in my "mad scientists lab". I changed the connecting rods twixt the anterior and posterior pointer to square section in the mk 2 to avoid rotation between marker sets.
  6. Simon built a few of them, but I don't have one any more. For those that are interested, here is the original drawing I sent to Simon when we were first discussing the idea of a STJ axis locator.
  7. Still don't like the idea of my balls being swivelled, Kevin. :wacko:

    I had a working prototype up and running the same day Kevin sent this sketch to me. I'd been trying to work out the relationship between GRF at the forefoot and the STJ axis during the propulsive phase of gait. I'd built a jig to put cadavers in which involved me drilling through the metarsal heads with a rod to simulate "low" and "high" gear propulsion. Kevin and I had been talking about this when he offered up this design. Most of the bits came from a local hardware store. The black sections holding the connecting rods together came out of a compass set (I had to buy 4 of the sets to get enough- at about £20 a piece!). Like Kevin, I no longer own one. On the upside, I'll never need to buy another compass in my life @circlesrus
  8. That means it's time for STJ Axis Locator V 3.1 !!:drinks
  9. fabio.alberzoni

    fabio.alberzoni Active Member

    Sorry...I made a matter of terminology.

    I would like to know if exist a tutorial about how to determinate the plantar location of STJA.

    I read every articoles you suggest me but I'm not sure to do this in the right way..

    eq rot.jpg

    Attached Files:

  10. Lab Guy

    Lab Guy Well-Known Member


    Relatively simple device, but nevertheless, you did a great job fabricating it.


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