I know of 2 cases where glucosamine had a dramatic and beneficial effect.
1. My father who suffered from chronic hip pain in his late 60s. His doc said it was something he'd have to put up with as it was just degenerative pending it getting really bad and then they'd look to surgery. Someone suggested he try glucosamine to relieve it a bit. He did and was amazed. Within a few weeks the pain had gone and he has not had symptoms back since and is now at the ripe old age of 89!
2. Another friend in his 30s suffered from knee pain and was givebn periodic cortisone injections to relieve it but these affected his mood and he hated having them. Based on my Dad's experience I suggested he gave the glucosamine a go too. Same result.
I personally take them as a runner for preventative reasons only. I can't personally prove it works but these 2 personal cases were convincing enough for me.
mmm I suffered from something similarly described after the Paris Marathon in the same place but my specialist described the oedema as an entity known as an osteonecrosis and was advised to rest for 4 months.
I've just run for the first time since then with no ill effects although I can still feel something but wouldn't describe it as pain any more.
To me yours sounds very similar to mine. I read about osteonecrosis and it doesn't sound great! but I think mine must be quite a minor occurrence otherwise he wouldn't be saying I could recover from it relatively easily.
I am increasingly suffering from this on long runs (races). I put it down to trying harder in a race so probably not trained to run that hard, plus I sweat a lot. I read about this and think I might try this in future races. http://www.nuun.com/