My left knee is screwed up. I can?t even squat close to failure in my thighs at high or low weights, even using a brace, without knee pain kicking in. Leg extensions do the same. I have a long history of trouble with that knee, and knee problems run in the family, so I need to jump through the insurance and medical hoops to straighten this out.
In the meanwhile should I keep doing lunges , leg curls, and straight-leg calf raises to work the rest of my legs, or should I just leave it all be until a doctor has looked my knee over? Are there any knee-friendly thigh exercises to replace the squats/squat press?