Hello,
I'm so sorry to hear about your frequent injuries! I'm chiming in here to agree with Sanddancer. Seven years ago, I suffered what I thought was my first tendon injury. One year ago I was diagnosed with Ehler's Danlos Syndrome, a disorder in producing one of the types of collagen the human body uses as a building block and sort of 'glue'.
Ligament and tendon injuries are the most common and most disabling part of this disorder due to their longer/hypermobile length, lack of tensile strength and poor healing abilities. We are prone to frequent dislocations and partial dislocations causing extreme pain. If this happens frequently enough, the tendons and ligaments in the joint can't pop all the way back into shape.
In normal people, these generally heal on their own and beyond anti-inflammatory meds, pain killers and steroid injections, orthopedic doctors don't have any ability to help. Every kind of surgery they've developed to physically shorten ligaments and tendons has failed- generally within 18 months of surgery.
I have severe right shoulder instability, instability in both hips and both SI joints, and patellar pain on both sides due to my knee caps not gliding properly. I've recently discovered something called Prolotherapy. These injections consist of a numbing agent, then an irritant followed by a pain killing dose of high concentration oxygen injected directly into the stretched and torn ligaments and tendons. The irritant causes new cellular proliferation, inflammation and healing and thusly, shortening of the damaged ligaments and tendons. If you are currently taking any anti-inflammatory medications- I'd stop now. They are blocking a natural healing response of the body. That pain is the feeling of healing. I made the mistake of taking them myself not knowing I was compounding the problem.
These treatments are rather controversial in the EDS community due to the rarer forms of EDS causing healing abilities so poor that they prevent the irritant from working. I have the most common form of EDS and the two treatments I've recently had in my hips and SI joint systems have taken me from thinking about a wheelchair to imagining hiking and dancing again. I too have always been a very active person and I look very forward to returning to my activities.
I'd look into visiting a geneticist to determine whether or not you have EDS. If so, and if it's Hypermobility Type III, I'd skip being told there is nothing available by an Ortho doc and go to the best Osteopathic Doctor you can find in your area.
After recieving my diagnosis, I realized I'd been suffering minor dislocations since childhood. Ten or so 'sprains' before 15 was probably not normal. Wishing you all the best and I hope Sanddancer and I are wrong. Without EDS or some other genetic connective tissue disorder though, the treatments I mentioned should be even more effective.