Both my knees are my own but my L knee was severely injured 18 years ago and is weak and semi-functional. I can just barely bend it enough to ride.

When I started using clipless pedals I did have pain on the L leg getting used to the lateral motion clipping out. It ached right about at the top of the fibula during non-biking also. It healed OK in a few weeks. Normally I leave just clip out on the R side each time I have to put a foot down; the L side only gets unclipped when I completely get off the bike. I take ibuprofen a couple of times a day and I don't know if that helped or not.

I am curious how it will be when I do have the inevitable L knee replacement. The doc who repaired my knee said I would be too crippled up in pain to walk by 2000 so I'm beating the odds so far.