###Human: Had arthroscopy for ACL injury. How long it will take to recover? ###Assistant: Hi. Usually, it takes three months to have complete recovery after arthroscopy with good physiotherapy done regularly. Physiotherapy includes quadriceps strengthening, hamstring stretching, and strengthening, full weight-bearing walking with a hinged knee brace, and knee bending for three weeks. The treating surgeon decides the frequency of doing exercise. Ideally, you should be able to bend the knee for about 90 to 100 degrees in three weeks post surgery.