Suggest Exercises For Tibial Plateau Fracture

I suffered a tibial plateau fracture 2 years ago which has almost finished healing, but I'm still awaiting surgery on a torn ligament in the same leg. This is making me so unfit because I just can't walk far at the moment and my local hospital refused physiotherapy on my knee until my Epilepsy was controlled. Is there any exercises I could do to get my weight back down and stamina back up?