I've tore my knee and so has my brother. The thing we talked about is once you get close to full ROM (range of motion) the doctor is basically done with you and you move on to extensive rehab with the PT crew. The doctor is still involved but only for check ups to make sure the ligament is still intact.
The PT crew (physical therapy) has a lot of pressure to get the injured leg back to 100% and stronger then before. The issue sometimes is when they neglect to continue to workout the non injured leg. Your muscle stock and density in the previous injured leg makes big strides, while the non injured leg gets minimal activity. One leg having more muscle and stronger then the other makes the player overcompensate with balance and pressure. Which if they don't trust the injured leg (which after PT is stronger) and continue to run and cut and put more pressure on the non injured leg tears and injuries can become more common.
Sorry that was a lot but I'm texting this on my phone after I just left a Ortho surgeons office this morning.
Basically: you injured your left, have surgery, you trust your right leg more psychologically cause it hasn't been injured. You go through rehab of left leg, right leg gets not as much attention, your left leg gets stronger and healthier, you begin to run and cut, not knowingly you still don't trust your left leg and putting a lot of pressure on your right leg, one twist or off pressure step when trying to truly open it up and run again and your right leg pops.
Now you tore your left rehabbed it and by mistake put more stresses on your right to compensate and you then run a much bigger chance of tearing your right leg up.