No, 90% is massive if true. Speaking from experience the surgery is an absolutely brutal experience. Even though my graft was successful, if I had my time over I'm very much not sure I would make the same choice. I would at least explore other avenues. Many people do fine without an ACL. In my case my cartilage went from, in my surgeons words, pristine (post injury and before surgery), to tricompartmental osteoarthritis 18 months after the operation.