Ironically, my right shoulder got torn up in my senior year, not from sports but from taking some girl roller skating. It popped out like 7 times before surgical repair. I lost al the elasticity and could no longer throw a baseball more than 100 feet. So tennis, for some reason, over team, was like therapy and I played for 42 years.
That is a wild story milani my friend! 3 months ago (Aug 6) I had I had my left shoulder replaced. It was an "anatomical" replacement, meaning simply it would look like my original shoulder structure after the new parts were installed. (If the rotator cuff is damaged, a "reverse" replacement is required, where the ball is placed on the end of the clavicle and the socket is placed on top of the upper arm bone - the humerus.)
After reading what happened to you (and sorry milani, having a laugh at your expense at the roller-skating story) I am amazed you could play tennis at all, much less singles, much less for 42 years. Good for you! It seems likely your rotator cuff would have been damaged, but if that was true, I doubt you could play tennis.
More likely this happened when your body was much more elastic, and the dislocations did not harm the RC.
My story is far less ****. My body has been invaded by osteoarthritis (thanks Mom....). So at age 71, I've had both knees replaced (2023) and this year my right hip and left shoulder. I'll never walk through a regular metal detector again without blowing it up.
I ran a lot of marathons in my 30s and 40s. I had a blast but it sped up the damage to my knees. Now I spin 5 to 6x/week and my cardio fitness is very good.
Anyway, I've heard a lot of strange stories about how guys have messed up their shoulder joint. Yours is the best milani!