Knee ligament surgery.  Age limits are changing.
D016118:Anterior Cruciate Ligament / Q000601:surgery; D000070598:Anterior Cruciate Ligament Injuries; D006801:Humans; D007718:Knee Injuries / Q000534:rehabilitation / Q000601:surgery / Q000628:therapy*; D007719:Knee Joint / Q000503:physiopathology; D008875:Middle Aged; D016059:Range of Motion, Articular; D013710:Tendons / Q000637:transplantation; D019415:Torque; D014182:Transplantation, Autologous