Hi Susanne, I'm a fellow New Yorker, I live in Queens (Queens Village).
Like you I spent 2 weeks in rehab, used the CPM machine 3 times a day for 2 hours each. By the time I was done, I had 120 degrees of ROM. When I went to my Phy. therapist 5 days after I got home the ROM was about 90 degree's. So I don't know if it works or not.
I'm glad you found this website early, I didn't until I was about 3 months out. (2 weeks short of 6 months now) Follow the mantra's, they work. I wasn't doing the ice, elevate and nap half as much as I should have been.
Take you medication ON TIME. (And my knee still buckles once in a while.)
It gets better, but for some (me) it's up and down. I've been doing great, but right now it feels like there's a band around my knee. Time to take it easy for a while. Ice, elevate, tylenol and nap.