Knee is not moving. Leg please help me.

I had a ligament acl full tear on 13 august 2015 , stayed on bed till operation on 9 september 2015 , doctor don't tell me to excercise so i was on bed for around two weeks ,then when i reached the consult the doctor who has done my operation he told me to excercise , but in 1-2 weeks sudden infection occured in the knee area of operation, then after doing excercise irregularly for few months my doctor consult me fr another operation in which i was given anesthesia and my leg was folded forcefully .my leg was folded nicely at the time of operation but when my doctor open up the plaster after 2 days my leg was again stuck .now my leg foldes about 85degree but not full. help me i am unable to even sit on chair properly . anyone who can help me for folding my leg please help me.