The tear seems recent. Review with MRI to study the exact site and type of tear.
According to the report , tear seems to be within the substance of meniscus.
Next Steps
As you are a runner ; try getting the meniscus repaired either conservatively or arthroscopic repair. This will depend on the site, type and extent of the tear.
Health Tips
Time is precious for you .
You need the best treatment and quality for your knee.