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Piriformis goes from anterior sacrum.
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Piriformis is a little weird muscle, it
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actually goes from, when I say anterior sacrum that means what side? Front. So it
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goes from the inside of the sacrum and then crosses right behind the greater
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trochanter like this. What is it going to be really good at? External rotation
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right, and then if i raise my leg up like this what is it going to be really good
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at? Horizontal abduction. Can you guys see how that would work? So we got
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external rotation this way, and then you lift up this way and it horizontally
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abducts this way. Your piriformis is actually your primary external rotator
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You have it backwards. Yeah so hip external rotation, horizontal abduction
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and if you guys want to take this one step further, above 90 degrees of flexion
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this muscle actually starts causing internal rotation of the femur. I'm
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guessing that's not on your kinesiology tests at this point? It was, yeah so guys
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what ends up happening, so what ends up happening is, that was totally on purpose.
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Alright so I told you guys the piriformis kind of comes this way right,
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alright so imagine it's like this, so that's external rotation there. You come
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like this and it's what joint action, horizontal abduction. If you get any
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higher ,now what just happened to my piriformis it's on top of my greater
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trochanter, can you guys see that? Alright so if it's on top of my greater
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trochanter like this, it now wants to pull it this way which is what joint
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action. internal rotation, does that kind of make sense. I'm gonna show you that
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one more time. Alright so we use my index finger here so here it's what rotation?
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External rotation here what does it do horizontal aBduction and then as it goes
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higher now what does one do pulls the greater trochanter up and does
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internalisation, does that make sense?
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Oh well I needed a leg anyway, be delicate with sling is that okay? Is that
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going to be in your way for notes. You'll deal with it, you get a close-up view.
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Okay all right problematic piriformis. The piriformis does have a propensity to
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get a little overactive. What's this yellow thing right here, does anybody know?
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Yeah it's your sciatic nerve, anybody know what sciatica is? Irritation of
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your sciatic nerve. If this got a little overactive what is it going to do to
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that nerve? It's going to pinch it a little bit. Now we don't want to upset
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the piriformis, what exercise have we mentioned a couple times that might
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upset the piriformis that horizontal abduction machine. Does it work the outer
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thigh, no definitely does not work the outer thigh. The outer thigh is what
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muscle? Vastus lateralis, which does what joint action? Knee
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extension yeah. So you're doing horizontal abduction, the primary
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horizontal abductor is your piriformis to work your outer thigh. With
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the risk of potentially offsetting some sciatica in the futur,e does that seem
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like a good risk to reward ratio to you. No that doesn't seem very good to me
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at all. No, all right.
