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Thanks to Craig Payne for the excellent bootcamp. He mentioned low-gear toe-off causes SI joint and I think he said piriformis issues. Can Craig/anyone explain fully?
Thanks
Re: Sacro-iliac jt/ piriformis and low gear toe-off
What I suggested was that if Bojon Mollor's low gear/oblique axis propulison is present, then it is harder for the body to transfer weight from one foot to the other in gait and that this is cause the SI/pelivc region to function "differently" or "harder", especially if the low gear propulsion is assymmetrical and there is some resultin assymentrical motion proximally.
Whether this is sufficent enough to cause problems is not something I would definitivly say (others would).
I can, however, cite a number of n=1's which did present with pain in that region, had a low gear propulsion and when it was fixed, they got better.
__________________ Craig Payne
__________________________________________________ ___________________________________ Follow me on Twitter | Run Junkie God put me on this earth to accomplish a certain number of things - right now I am so far behind, I will never die.
Re: Sacro-iliac jt/ piriformis and low gear toe-off
Quote:
Originally Posted by Pod on sea
So in your experience do the issues occur on the same side or the contralateral side?
Can't say I have noticed any pattern yet, but also can't say I have been exactly looking for it either ... good research project for someone to take on.
__________________ Craig Payne
__________________________________________________ ___________________________________ Follow me on Twitter | Run Junkie God put me on this earth to accomplish a certain number of things - right now I am so far behind, I will never die.
Re: Sacro-iliac jt/ piriformis and low gear toe-off
Quote:
Originally Posted by Craig Payne
What I suggested was that if Bojon Mollor's low gear/oblique axis propulison is present, then it is harder for the body to transfer weight from one foot to the other in gait
Re: Sacro-iliac jt/ piriformis and low gear toe-off
Has it been shown that if our centre of mass is moving laterally when it should be moving medially it can cause pain/strain in the SI jts?
If so, would it also have implications in piriformis syndrome or other glute/lat hip muscular pathology?
..or if you have a tight or overactive piriformis does that lead to a more lateral/abductory twist at toe-off?
Ahh Craig, see what you've done..questions,questions!
Re: Sacro-iliac jt/ piriformis and low gear toe-off
Quote:
Originally Posted by Craig Payne
What I suggested was that if Bojon Mollor's low gear/oblique axis propulison is present, then it is harder for the body to transfer weight from one foot to the other in gait and that this is cause the SI/pelivc region to function "differently" or "harder", especially if the low gear propulsion is assymmetrical and there is some resultin assymentrical motion proximally.
Winter showed that weight shift was a fairly normal process that can be explained by location of center of mass and location of center of pressure in the frontal plane. In gait you have the line of progression. As you walk toward an object your average position of center of mass will oscilate around the "line of progression." The placement of the feet will be further away from the line of progression than the oscillation of the center of mass. So as you are on one foot, your center of mass is medial to the center of pressure so this creates a moment for you to fall toward your other foot. The farther the distance from the center of mass to the center of pressure, the bigger the moment, the faster you will accelerate toward the other foot. (Think of a tennis player awaiting a serve. They stand with their feet far apart so that when they lift one foot up they will fall faster in the direction that they want to go.)
So, with high gear push off, the center of pressure is more medial and with high gear push off the center of pressure will be more lateral. So, with foot placement being the same, you should fall faster toward the opposite foot with low gear push off.
One of the things that I was taught when I was a student was that with orthotics you may see a narrower base of gait, so this may not be a constant.
So, the above explanation is not a good one. That doesn't mean that piriformis can't get better for some other reason when you change the push off.
Eric
The Following User Says Thank You to efuller For This Useful Post:
Re: Sacro-iliac jt/ piriformis and low gear toe-off
Quote:
Originally Posted by efuller
Winter showed that weight shift was a fairly normal process that can be explained by location of center of mass and location of center of pressure in the frontal plane. In gait you have the line of progression. As you walk toward an object your average position of center of mass will oscilate around the "line of progression." The placement of the feet will be further away from the line of progression than the oscillation of the center of mass. So as you are on one foot, your center of mass is medial to the center of pressure so this creates a moment for you to fall toward your other foot. The farther the distance from the center of mass to the center of pressure, the bigger the moment, the faster you will accelerate toward the other foot. (Think of a tennis player awaiting a serve. They stand with their feet far apart so that when they lift one foot up they will fall faster in the direction that they want to go.)
So, with high gear push off, the center of pressure is more medial and with high gear push off the center of pressure will be more lateral. So, with foot placement being the same, you should fall faster toward the opposite foot with low gear push off.
One of the things that I was taught when I was a student was that with orthotics you may see a narrower base of gait, so this may not be a constant.
So, the above explanation is not a good one. That doesn't mean that piriformis can't get better for some other reason when you change the push off.
Eric
Eric, I agree. Hence my "why?" question. Only one point: you said high gear push off twice: "So, with high gear push off, the center of pressure is more medial and with high gear push off the center of pressure will be more lateral."
Re: Sacro-iliac jt/ piriformis and low gear toe-off
Quote:
Originally Posted by Simon Spooner
Eric, I agree. Hence my "why?" question. Only one point: you said high gear push off twice: "So, with high gear push off, the center of pressure is more medial and with high gear push off the center of pressure will be more lateral."
Thanks, Simon. the second high should be low.
with high gear push off, the center of pressure will be more medial with low gear push off the center of pressure will be more lateral.
Re: Sacro-iliac jt/ piriformis and low gear toe-off
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How might angle of gait, i.e. foot placement influence this? For example: in-toe; Manchester style (very broad out-toe)?
_________________
I would think that an in-toed gait may require a greater abductory twist to move the COP medially perhaps transferring a rotational force more proximally greater than that of an abducted gait...perhaps.
__________________
Graham Curryer
None of us know what we are doing, but some of us know more about what we are not doing than others!::
Re: Sacro-iliac jt/ piriformis and low gear toe-off
Quote:
Originally Posted by Graham
_________________
I would think that an in-toed gait may require a greater abductory twist to move the COP medially perhaps transferring a rotational force more proximally greater than that of an abducted gait...perhaps.
Why does the centre of pressure need to move medially?
Sacro-iliac jt/ piriformis and low gear toe-off
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