Does anyone know of any bike fitters who specialize in fitting for those of us with artificial joints? I've got both hips and a knee, and although I don't think the hips would affect the way I ride, I'm pretty sure there might be some compensation on the knee replacement side. I've had a thorough fitting recently, but not sure how much the artificial knee was taken into account. I don't have much pain in that knee when I ride, but discomfort behind the knee which is directly proportional to how hard I'm cranking. And in Western PA, you don't ride more than a quarter mile without a good-sized hill to climb. Any thoughts? Thanks!