I have been told by a rhumatoid doctor that I am hypermobile and apparently quite badly- though I don't agree with the quite badly part as I read about hypermobility and there are only some of the areas I have hypermobility on- at least what I deem as hypermobility (so I guess open to arguement).
I have constant lower back pain and have been told its due to HMS (Hyper Mobility Syndrome) though I'm not so sure myself. I've been also told that making my core stronger would mean I'm less likely to put strain on these other joints which do already hurt or are at risk of hurting joints. I also have osteoarthritis (apparently this is linked to hypermobility) which makes it even more important that I do something about it.
I have to say, the info you've been given seems pretty indepth and I'd love to have your Doctor- the Doctor's I've seen have either just said they don't know or have looked at am MRI scan and said everything is fine despite it feeling anything but fine. I'd love to have seen your Doctor!
I was told I have a certain amount of degeneration in both my knees and my ankle (the scan only did my legs not my back, I only had an MRI on my back and it was an MRI which had shown my legs to be fine.) the degeneration would otherwise be known as osteoarthritis and yes, my ankle especially did ache. In the past I've had sprained ankles as a result of being hypermobile (my ankles do this odd flicky thing before they settle on the ground) and this could have caused the description for the osteoarthritis. I have since taken up a more barefoot style of running (I have a midfoot strike rather then forefoot or heel strike) and about 6 months after that diagnosis for the first time in a year the pain in my ankle had gone. I've also not had another sprain since (touch wood) where as before I was regularly going over on it.
Its not a cure and most Doctors and physios would refuse and possibly be holding their breath to want to strangle you because to them running is an extreme sport due to the impact and anything which reduces the protection you have but what they don't understand is that done properly the impact is not the same because its dissapated throughout your body rather then as a sudden jolt with each foot strike. Its very important to read up about this type of running if you are interested in trying it and attempting it very slowly over a few months. Its not a cure, its just what I have found helped me and helped prolong the running I could do without pain.