I just had my cast taken off my broken ankle and i'm supposed to walk on it but i can't. should i use crutches or can i hop?

Crutches: Use crutches, but make sure you are actually trying to walk normal. When pain reduces, move to one crutch. Use on the opposite side from the fracture. Eventually, you should be able to completely discontinue the crutches. You must let your foot feel the ground each step though.

Probably need pt: I would not expect you to walk normally after a cast is removed. The only good part of cast immobilization is the fracture heals. Unfortunately, the muscles atrophy and the ligaments and tendons become tight from lack of use. You probably need some therapy to correct the above problems.

Crutches/boot : Hopping is never a good answer. After casting, it's usually best to transition to a boot or a very supportive brace with continued use of crutches if still difficult to weight bear or the fracture has not reached a point of adequate healing.

Give it time: You should be able to walk soon. Give it time. If the surgeon said you can walk it mean you are safe too but you will likely take awhile to get your balance an strength back.