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.
Surgery is invasive and recovery is rough. Not sure what the data says but I would’ve liked this option
Standard of care could be bracing followed by surgery if it's not taking.
How reliable is surgery?
Surgery involves taking strength from another ligament (and attached muscle group) and a long and painful recovery process.
Not to mention costs tens of thousands of dollars.
Surgery is expensive and ACL tears are not "critical." Showstopper for basketball, soccer, etc, but not for walking, squatting, running, etc
(I've had a re-torn ACL for ~8 months now. I'll get surgery eventually.)
You have to remember that surgery comes with very significant secondary risks (MRSA infection, etc, etc).