Sprainankle on crutches for a month.xray showed not broken however it was extrem. swollen after four months scar tissue accumulation(inside) stiffness?

Possible: You should try physical therapy. Joint manipulation, stretching, and exercises specific to the ankle should help you get rid of the stiffness and increase your range of motion.

Possibly get MRI: Further evaluation with MRI of the ankle may be beneficial. It depends on symptoms but if one has limitation motion after an ankle injury, this could be secondary to impingement secondary to scar tissue. Mri could help in that case.