No bud, never caused me problems with my knee giving way. Mine doesn't ache often, but occasionally after a busy day I'll be laying in bed and the old injury will ache enough to trouble me getting off to sleep.
I was on crutches about 6 weeks, and scrupulously followed the physio instructions. I'm 49 (47 then), above average height and weight, mesomorph with minor ectomorph characteristics.