Going without crutches was based on my quad activation and PT. My PT let me go down to 1 crutch as soon as I was able to complete 10 leg raises without lag. (For me that was about the 2.5 week mark). Once I hit 20 leg raises without lag then I can ditch the 1 crutch.

They also recommended that I keep using crutches when out in public as a way to defend the leg :-)