I have injury in right leg, need surgery or is there another option?

i have injury in right leg knee and the report of MRI as follow
MRI report:
The ACL could not be seen near its femoral attachment while the rest of its fibers are seen sagging on the tibial surface with intra substance areas of high signal intensity in all pulse sequences.
Abnormal high SI bone marrow area on T2WIs and STIR images seen at the opposing lateral femoral condyle and lateral aspect of the tibial plateau.
Normal MRI appearance of both menisci, PCL, collateral and patellar articular ligaments as well as the quadriceps and infra patellar tendons.
Mild intra articular joint effusion is noted.
Normal marrow signals of the examined bones and the overlying articular cartilages.
Intact peri-articular musculature with preserved intervening fat planes,

Findings are those of complete tear of ACL with mild knee joint effusion

i would ask if this case need surgery or there is option an medicine treatment.