My wife had both replaced about 6 years ago. Use the continous motion machine. DO THERAPY NO MATTER HOW MUCH IT MAY HURT. Need this right off the bat to get maximum range of motion and to prevent scare tissue from forming. Keep the paper medical tape over the incisions after staples are removed for several weeks. Use cocoa butter and vitamin e oil after the incision is healed - spread on several times a day and rub in firmly, then after dry put the paper tape back on. Helps to prevent scarring. Don't get in a hurry, follow the Doctor's orders. Do what the Physical Therapist says. My wife had in home therapy for 3-4 weeks. Keep thinking "This, too, shall pass", don't rush it.