3, MRI diagnosis of anterior cruciate ligament injury Normal anterior cruciate ligament MRI image Fractured anterior cruciate ligament MRI image: post-surgical reconstructed anterior cruciate ligament MRI image: 4, Anterior cruciate ligament injury arthroscopically: normal anterior cruciate ligament microscopically: fractured anterior cruciate ligament microscopically: combined anterior cruciate ligament rupture with barrel shank-like tear anterior cruciate ligament rupture combined with cartilage damage: post-reconstructed anterior cruciate ligament microscopically: