I injured myself playing basketball in January 2004 and had ACL reconstructure surgery 2 months later in March 2004. In retrospect I should have waited longer, but I was stupid and stubborn.
My knee was still swollen from the original injury, and the surgery just added to the swelling and pain. Consequently the recovery has taken much longer than it should, and it hasn't gone as smoothly.
It's now almost a year post surgery, and I still have pretty bad muscle atrophy...