Any reason why you don't want to use flats? Since you're ex-military, maybe you're sensitive to looking different from the others in the group (cycling group or others you see cycling?). You could always use a BMX-style flat with pins on the surface, giving your shoes sercure placement and the ability to be moved a little bit. I've got sciatic nerve problems and this has worked well for me (along with some flat bottom tennis court-style shoes). Current fav pedals are Crank Bros 50/50s (old style, which are inexpensive 'overstock' sale items now). Also, since your leg was damaged, any other problems with it (nerves, muscle use, etc?); just wondering since you mention cycling is all that's left for you.