I am going to lay out in detail what is happening with your son. You will not get this information from any other poster here. What I am going to tell you is the anatomical truth as it exists in kinesiological force applications with each mechanical action your son is trying to learn from someone who does not understand the whole story about how injuries occur or exacerbated by some positive changes (forearm pronation) added on to an intuitive (centripetal(arm flying away and to the side of the body)) traditional delivery.
Yes! But only the one your son is (not inner shoulder pathologies) experiencing because now he is producing even greater arm rotational speeds in deceleration across his chest. Pronation is not the cause though. The cause of his pathology is levering the proximal end of his Humerus against a flexed pectoralis major muscle that cracks the center of his still open proximal Humeral growth plate, basically a broken bone within the growth plate. This large growth plate will not close and solidify until he is biologically (not chronologically) 19 years old
His chronological age means nothing!!! What is his biological age? Is he an equated maturer, delayed maturer or advanced maturer?
Underload programs should not be performed until the proper overload interval exercises have your son fit and robust, this takes a minimum of 8 weeks of “sport specific” overload (not general) exercises! He must be strong enough to withstand the added stress under loading produces.
This is very good news, he will learn how to protect his elbow by allowing him to hinge his elbow thru voluntary concentric extension and back towards involuntary eccentric flexion so he does not bang the back of his elbow together in a ballistic hyper extension.
This forearm joint action has him contract the muscles that attach at the medial epicondyle (the flexor group and the pronator Terres) on the Humerus also helping to protect his UCL by pulling the Radius bone towards his Ulna bone. This will also allow him to avoid loss of range of motion in both directions in the elbow joint. This will keep his cartilage at the back of the elbow from splitting, where osteoblasts (bone growth cells) grow through them and become spurs that later break off and become loose impediments within the elbow joint. It will allow him to avoid severe inflammation, I can go on but this will suffice as presented.
[quote]“Highschool season has started & he has discomfort in the outside of his shoulder when he pronates any pitch.”
This is because he is using his traditional finish where he slings his arm across his chest at recovery only now it is much more speedy. The fix is not to throw out the baby with the bathwater but to learn how to fully rotate the shoulders 180 degrees instead of 90 to 110 degrees the way he is doing it now. With his low Humeral drive that is contracted by the Pectoralis major where the arm horizontally pulls the ball towards the side and then correspondingly across his chest levering the Humerus right where the proximal Humeral growth plate exists. You need to get it x-rayed and the Dr. will find a barely visible crack in the growth plate.
To test this have him lay his pitching arm across his chest and then push the wrist against his opposite lower ribs. You will notice the top of the Humerus pull away from the glenoid cavity, slightly separating the shoulder where you will also see the head of the Humerus (ball) pull out and away from its fossa (cup). This action also stretches the posterior capsule ligaments leaving him with a looser shoulder causing instability and what is known as “dead arm”.
The fix is not to eliminate pronation!!! The fix is in how to recover your arm correctly that is never talked about by the novices whom previously posted.
Have him throw from a higher arm vector (slot) by tilting to his glove side.
Have him rotate his shoulders fully 180 degrees by punching his ball arm leg through instead of anchoring it back perturbing rotation. This will allow him to have his arm drive straighter towards the target with his elbow popped up at recovery.
This will allow him to engage his Latissimus Dorsi so he can actually powerfully pronate his forearm by concentrically contracting his pronator terres muscle and powerfully inwardly rotate his Humerus that he is currently not doing with his traditional arm drive.
I have seen this hundreds of times and fixed it every time with these mechanical tenets.
Get that video and I will show you what I have laid out is true before even seeing the video!
Yes, here at “lets talk pitching “ read all you can get from Kyle Boddy from driveline baseball and your child will flourish without the prospect of injuring himself, he is one of the only ones that understands this important discovery. All others are remnants of the past and quickly disappearing and why they fight the good information with false and misleading info at every turn as relics often do.
Another good source of information is at RPM pitching that is run by Bill Peterson.
By all means get to Dr. Mike Marshalls site (an actual credentialed expert) where all injuries are explained in Kinesiological and anatomical detail so your son will have a chance to continue to enjoy the game from the bump.