Lower Back

NoonTime said:

Look... I posed an experiment, you responded with comments that it was abduction and adduciton. I went with that and am asking some follow up based on your answer. This has nothing to do with "explaining it" whatever you think that is.

I am asking you (the expert) specific questions about a movement that you said was happening. Is it really that hard to address the questions that are asked instead of making it about something else?

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jbooth said:

From the position that you describe; Moving to knock-kneed is an adduction movement of the femur, and moving the knee out is abduction. To internally rotate, or externally rotate from that position, the foot must pivot.

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jbooth said:

It happens from abduction and external rotation of the leg. I've said it many times. You can deny it from a point of ignorance, all you wish. Maybe someday, you'll understand it.

Every strength coach, physical therapist, bio-mechanist, and MD in the world knows that abduction of the femur when standing, moves the torso, but you don't believe it. IMO, that makes you look kind of foolish. Abduction is initiated by contraction of muscles that connect the pelvic bone to the femur.

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NoonTime said:

I know what you've told me over and over, I am not asking about that.

when I get in an athletic batting stance like in my experiment in the rear leg thread, and I adduct my rear leg to get to the "knock-kneed" position like you said here


and like Stanton is doing here (please confirm if you see his preswing action here as adduction)

when I am in that stance and using the muscles that adduct to create the movement... what is happening to the femur position in the socket with respect to being IR'd or ER'd? Does it stay neutral the whole time? Does it have a range of being in an IR'd position when my leg is max adducted and being in an ER'd position when my leg is max abducted?

I am thinking that when one adducts while in that stance and their hip joint is in a flexed position, that the femur also attains a position of being in an IR'd position relative to the socket but would like some confirmation. As an expert on such matters, can you please let me know if I am thinking about this correctly or not. Thank you!

--NoonTime

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jbooth said:

It happens from abduction and external rotation of the leg. I've said it many times. You can deny it from a point of ignorance, all you wish. Maybe someday, you'll understand it.

Every strength coach, physical therapist, bio-mechanist, and MD in the world knows that abduction of the femur when standing, moves the torso, but you don't believe it. IMO, that makes you look kind of foolish. Abduction is initiated by contraction of muscles that connect the pelvic bone to the femur.

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jbooth said:

The little kick-in that he did with his back knee, is adduction while the hip and knee are flexed.

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jbooth said:

The little kick-in that he did with his back knee, is adduction while the hip and knee are flexed.

He then shifts weight onto his back foot and kicks his front knee and hip inward, which puts his REAR hip into a flexed and INTERNALLY rotated position. When he starts to swing, he abducts the rear femur and it also moves to an EXTERNALLY rotated position as his rear heel lifts. After his rear heel lifts, his femur is adducted and internally rotated back to the neutral position. The adduction and internal rotation occurs during the unweighting process that occurs after the abduction and external rotation shifted the torso to the front foot.

Once the back heel comes up the push from the back is nearly complete. The adduction and IR is not supplying force. Some force may still be applied after the heel comes up, from a contraction of the gluteus maximus that is applying an extension force to the femur.

All of this causes force to be applied to the front foot. The Earth pushes force back, up through the front leg and applies force into the front hip socket. This completes the pelvic rotation.

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