I'm not sure about the others around here, but injuries for me is a true hindrance and nuisance. Not to mention painful.
I probably had bad knees and I still do have bad ankles especially the right one due to an old football injury.
I was interested that you actually recovered from a knee injury involving the cartilege. Most ppl don't. Sitting seiza is still painful, but with warmups and an ankle brace, its now more than bearable.
What are the things, exercises, supplements or otherwise, you would advice for me to do/take in order to defeat the injury as you have done?