I would avoid crutches. You need both hands to use them (think about standing in front of a fridge with a walker versus crutches). They offered me crutches, and I would have been dropping them all over the house. A walker stays put when you need it to, unlike crutches. I used the cane around the house (after the first 2 weeks) and a walker when going to physical therapy the first month. After 1 month, I was told a cane was okay outside the house. I was very stable on my feet, but I discovered that I had a tendency to rotate on the ball of my foot when turning corners, which was bad for the knee's healing.
I went to an outside physical therapy place the day after I left the hospital, so you also have outpatient physical therapy as an option. I enjoyed getting out of the house, and a lot of the repeat knee patients there said outpatient was the way to go.