whtmtHere's a thought. Try a BOSU, it stands for "Both Sides Up". It will provide better balance training than a balance board or most other less dynamic training devices. Go to Google and put in the initials BOSU and it will come to its site.
I blew out my left knee in March of 2005 and spent most of the last year training on this device. You can do core work outs or bounce dymanmically on it. I bounce to country music with a large mirror to see my body position in it. It will give you alot of dynamic balance training and it was designed by high end skiers, mogul specialists and racers.
It looks like 1/2 of a Swiss Ball with a hard disc on one side. You can either place it dome side up or disc side up to do a variety of workouts. I was able to bring my knee back by doing single leg squats to 90 degrees with it. If you place the dome side up you will work the ankle joint harder, since you never stop trying to balance. If you place the disc side up you will work the knee joint harder and balance is easier.
I do angulation bouncing, and others. I have found you can watch your upper body stay completely quiet if you're careful, like skiing with ski poles lying across your wrists while bouncing. I have actually found that I'm able to do 180 degree spins with the ski poles on my wrists and not lose them, while bouncing. Try it it's great fun and you can also run in place. I have actually had my heart rate to 154 bpm on this thing. It costs about $110-$135.
Best of luck with your training.
whtmt & Mackenzie 911