I have read your query.
You must go to surgeon who can arthroscopically repair your torn ligament of shoulder joint. As shoulder joint is very complex joint it can be examined and repaired satisfactorily only by arthroscope. Arthroscopic surgery
can be done with only minimal incision which gives cosmetically better scar. Patient can also be allowed to move his shoulder joint with a week or so with physiotherapy
But for your age i.e 70 years, it is not advised to do surgical procedure on ligaments of shoulder joint as ligaments usually get fragile if age > 60 yrs and get torn during repair. So surgery is not that eventful as compared to young people. For your age group we advise physiotherapy.
I hope you have gotten your answer