
Originally Posted by
jseek
Stability---the ability to control and maintain a normal and hopefully painfree joint position as u move it.
Ur shoulder being flatter and challenging by weakness is not stable. The oa is due to excess slippage caused but inability to control shoulder movement...and it's breaking down faster than u r repairing
The shoulder is very mobile....therefore has inherently loose ligaments. These ligaments can be thought of as passive (ligaments) and dynamic (rotator cuff muscles). The rotator cuff pulls on the passive to tighten or losses as needed so we can move the shoulder
The bony scapular bone called the glenoid is normally small...and is made bigger by the cartilaginous labrum....and then all held together by the previously mentioned passive & dynamic ligaments.
And of course, at rest, in a normal human (sorry)...the scapula is angled so that the glenoid is most importantly tipped slightly toward the head....ok it's basically like a vertical wall, but angled toward the head like a ramp, so that the arm has a bit of a "lip" to hang on...so the rotator cuff doesn't have to be active all the time at rest
So for you...a lot of ur details I couldn't find...age? Lifter or ??goals? Can u move ur arm at all or are you worried about only benching 500lbs...I read the thread but my apologies for the senior moment....
1) scoliosis extending to thoracic region will affect ur ribs , collar bone, shoulder blade position, snd shoulder joint...so I'm at a loss to explain things I don't know about
2) last thing I'd recommend as an active person is the radical surgery you mentioned. But I don't know ur history, exam, or imaging results. Sorry
3) goals???
4) stabilize the shoulder snd back would be a great idea for you....both static positions of back and shoulder...then progress to active movements being sure to be aware of spine and shoulder positions....if popping, cracking, shifting, or wierdness occurs...back off. If not and no pain...progress.
Ie progress static plank exs for core ..snd shoulder strength
Be aware of shoulder width on all exercises....bench...get narrower...will decrease problems. Narrow incline better (old labrador tears won't like flat bench). Narrow grip pulls owns or rowing....curls or push downs with comfortable angles grip bars instead of straight...will help rest shoulders....
Etc
More details gets better responses