I've had both knees done twice. My running was basically done after 2nd scope, but I wasn't ready to face that until scope #3.
What it boils down to are a few key things:
1. Mechanism of injury. In your case, it sounds like you can pinpoint one particularly event as cause. That *might* work to your advantage since it's not just wear and tear over time.
2. If surgery is done, the amount of cartilage loss is a key element in your recovery and subsequent return to running. It will also dictate what options are viable for you to choose.
3. The rehab is critical. Some people will tell you that it's a cake walk and that you'll be back in no time. That may or may not be your story should you choose to have surgery.
Things I learned after the fact.
1. Get a Doc who will tell you both the best and worst case scenario based on your MRI-which may not tell the whole story despite what some will day.
2. There are plenty of non surgical options depending on the amount of cartilage loss/damage. You may qualify for PRP (Platelet-rich plasma)
http://orthoinfo.aaos.org/topic.cfm?topic=A00648
. I've also known people who did well with transplants from either a cadaver or other parts of their own body. Also, Ohio State University has pioneered plastic meniscus implants. Not sure how that's gone, but it's too your advantage to see a Doc who knows and can offer the option that is best suited to your situation.
3. The body will heal and/or recover on it's own time table. The Doc and the PTs will most likely dwell on the best case, but it's best to let the swelling subside before getting too aggressive with rehab beyond ice and simple ROM stuff.