I’m not sure exactly what happened to my friend other than that he had knee surgery and has had problems with them.
This is a direct quote from him on the surgery:
“Knees I had lateral releases, and all the cartilage replaced in both knees as well as a cartilage/bone plug but in on the back of both kneecaps.”
He wants to get back into shape. Not sure if squatting would be advisable for him or not. I’m relatively experienced and would be working with him on form and mobility if he chose to do so.