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