I was doing randori with a judo guy that was 20 years younger than me....and about 25 lbs heavier ....all muscle. He did an Osoto Garie that caught me on the side of the knee....a complete knee dislocation....ripped the ACL in half, tore the PCL and Interior MCLs and meniscus.Most pain I have ever felt.....and the most relief when it popped back in.
He almost got sick to his stomach when he heard the pop....then again when it popped back in place.
Mark, sounds a bit like mine. Look after that knee. My current specialist tells me the school of thought now is my osteoarthritis is due to the accident and the treatment for that injury had no effect one way or the other on my later life outcome. Just something to keep an eye on.