Treatment Choice - Treatment Choice | Compare Prices | Find Hospital | Shoulder arthroscopic decompression is to take pressure off the inflamed shoulder tendons and to provide a pain free mobile and strong shoulder. The operation is suitable for people whose symptoms have not responded to non-operative methods such as injections or physiotherapy. They have usually undergone assessment of the tendons in the form of an ultrasound scan or MRI scan Overall, this sort of surgery should have a success rate of eight and a half to nine out of ten with substantial reduction in pain and a return to normal activity.