Had knee surgery 5 days ago, using c.p.m. machine 9 hrs a day.being bed ridden i feel sluggish, are there any excercises i can do while sitting in bed?

Yes: I'm concerned you are still spending so much time in bed. Please check w your doctor about being able to get out of bed using a walker or crutches. Other exercises could include upper body exercises-with or without weights. Are you doing any physical therapy? And crunches. At some point, if doc is ok w it, swimming should be an option.

Check with MD: But I am a fan of isometric exercises and therapeutic resistance bands which can be used in bed. If these exercises are limited to the upper extremities, i feel that this is acceptable but first check with your surgeon.