I first 'blew out' (dislocated) my right knee in early 1975, and again in 1977 when I was attending Ohio State. They wanted to 'replace' my knee. The 'life' of a knee replacement was about seven years. How many of those would I have gone through in 40 years? Yes, I've blown that knee out a half-dozen times since then, and have moderate osteo-arthritis. If I get overly fatigued, it has a greater chance of going sideways. I wear a brace if I feel the need. Sometimes just a 'sleeve', but other times I use a hinged brace.
[Harry Callaihan voice] A man has got to know is limitations! [/Harry Callahan]