Today, I stumbled upon a blog ( http://aesm.ca/treating-osteoarthritis-of-the-knee-with-hyaluronic-acid-injections/ ) on treating Osteoarthritis of knee and after reading it I seem to have many doubts. I hope you people can help me clear them. The first one is, What causes osteoarthritis of the knee? I failed to find an answer for this specific question. In the blog they have mentioned different contributing factors which can lead to this condition but does anyone knows more about this? My second question is, I found that one of the most effective methods for pain relief is hyaluronic acid injections. Is there any way to get relief from the pain?