What Causes Toe Movements And Control Problems In Both Legs?

dr i am 66 years old going for TKR operation on both knees soon by 15 months, is it advisable to do any exercise on the knees while waiting for the operation and secondly i am having less movemens in toes in both feet and cant control my toes and is it toes athrritis or any disorder or is due to my knee problem affecting my toes advise needed aND INFO thaNKS