Hi
Given your age, I'd go for the ACL repair. You will need to rehab well though to regain strength and control. Also recognise that an ACL repair is never as good as your own ACL. It will be hard for you to regain knee stability and control to play sports given your history if you don't have repair. Also under arthroscopy, they could have a look and see whet other damage might have been done. Scans never show the tru picture. you must also be aware that you will have to look after your knee for the rest of your life if you want it to last!
Ashley
milfordphysio.co.nz