Left shoulder and hinge motions
 

In an archived thread (Now You're Headed To Jail) Yoda wrote that the left shoulder has nothing to do with the hinge motions. Is that assertion perfectly true?

I can understand that it is true with respect to mechanical models where one has a "fixed" hinge pin location and one merely varies the pin orientation and thereby the blade motion. However, in a real-life golf swing the left shoulder socket is moving in space while the hinge motion is happening. Is there "evidence" that the arc of left shoulder movement and the "exact" point-location of the left shoulder socket in space at "every" moment during the followthrough is exactly the same for the three different hinging actions?

Jeff.

Shoulder Motion And Hinge Action
 

Sounds like a good 'white paper' project, Jeff. I'll be your first reader. Go for it!

Please be sure to include this anomaly: It is quite possible to execute each of the three Hinge Actions without moving the left shoulder at all.

:)

P.S. Good to have you back. We appreciate your many thoughtful contributions to our site. :salut:

Yoda - I agree that it possible to execute the three different hinging actions under static conditions (keeping the left shoulder still) - one simply rotates the left humerus to a variable degree as one mimics the followthrough action. However, I am curious as to whether the same phenomenon occurs during a "real life" golf swing's followthrough phase - as to whether the different degree of variation in rotary angulation of the left arm flying wedge seen in the three different hinging actions is solely due to variations in the degree of rotation of the left humerus or whether they are also partly due to i) variations in the spatial arc of movement of the left shoulder socket and/or ii) variations in temporal sequencing of the left shoulder socket movement in space (instantaneous temporal variations in shoulder socket locus during its arc of movement) during the followthrough phase of the golf swing.

Jeff.