1. Physical rehabilitation
after ACL surgery may take several months to a year, and 5 months is a very short time period.The length of time until you can return to normal activities or sports is different for every person.
2. After an ACL injury
and surgery, the knee is never "normal." [ as you have torn your graft,keep one thing in mind: Revision ACL reconstruction is generally not as successful as the initial ACL reconstruction.
3. because it causes Limited Range of Motion, thus cause of your complaint [hesitant to bend leg]
PS: Surgery immediately after the injury has been associated with increased fibrous tissue leading to loss of motion (arthrofibrosis) after surgery.. so check with your Orthopedic surgeon for necessary instructions and post operative rehabilitation.