Diagnosis: Subscapularis and Supraspinatus tendonisis and Long Bicep tendonisis with mild tendonisivity

Hi Forum, my first post!I was recently diagnosed with Supraspinatus and Subscapularis tendonisis and Long Bicep Head tendonisis with mild tendonisivity (All on my LEFT ARM).When I was about 11, I also broke my LEFT ARM from the elbow to the wrist, both bones were broken and I wore a cast for a month!I'm 26 now and heavily into sports. I have been practicing boxing for over 7 years now (on and off) (a mixture of kick-boxing, muay thai and normal boxing). I'm an orthodox fighter, which means my LEFT arm is my jab arm.... My personal diagnosis, through repetitive movements of throwing a jab (a protruding movement), I lack the muscles surrounding the rotator cuff for a retractive motion, and thus after each session I don't feel pain... but stiffness!!!There is not stinging pain, but theres a constant need to rotate my shoulder blades backwards in an up-back-down movement to "put them back into their sockets". This temporarily alleviates the stiffness.I also used to do dragonboat on the left side of the boat.I practice yoga 4 times a week, but in some stretches I feel like it aggravates the inflammation.Would you have any tips or exercises to reduce inflammation and increase mobility on my left shoulder?In addition, I feel that my left rib-cage muscle has a weak connective tissue to one of my abs on the left side. There is one ab that is protruding from my core. It's hard to explain.Here is a picture of an exaggerated position to showcase how my left shoulder is hovering the rotator cuff imgur: the simple 404 page could not attach the image.Please, I seek your guidance and knowledge.Cheers,Fred

It really sounds as if you have very weak scapula stabilizing muscles, such as serratus, traps, latissimus, and possibly even some trees or rhomboids. Remember all the major RTC muscles attach to the scapula. You can work these in open chain or closed chain and Barry the angle and the speed you work on them. Also remember that a lot of evidence these days is showing the benefit of eccentric strengthening. You can look these up or we can "talk" about them together here. It is thought that RztC years in baseball are due to eccentric overload as the force in the throw occurs. The RTC is a complex of 4 major separate muscle pulley or lever systems whose resultant is to maintain a constant center of rotation regardless of where the arm is positioned. The shoulder blade is the stabilizing platform that starts in allowing this to happen. With injury things don't position or move the way they are supposed to when they are supposed to. The overall pulley system becomes skewed or biased and some muscles work harder and as the scapula has excessive movement , contact begins to happen in places it is not meant to.
The specifics along with the overall picture are important to understand.
I am using text so really won't know how well my thoughts are transcribed.