It would be nice if we got more detail on why they are doing another repair surgery rather than a partial meniscectomy which is the route Steve Mason went when his repair failed nine years ago. A repair seems to be better for long term health if it works, but it's a big if.
http://realsurgery-meniscustear.com/meniscus-repair/
Key Points
Surgeon opinions: Today, only about 10 percent of meniscus tears can be treated by meniscus repair. Meniscus repair is an option only if the patient is young and the site of the tear has good blood flow.
Failure rates are significant, and patients need a surgeon with extensive experience in meniscus repairs; not just meniscectomy.
Most meniscus tears cannot be repaired. To heal after a repair the tear needs good blood flow, and most tears don’t have this. Also, meniscus repair is usually limited to only younger patients. Recovery is much more involved and lengthy – starting on crutches and followed by 3-6 months of gradual recovery. A stable knee is important, so ligament injuries like ACL have to be addressed too.
Surgeons estimated that the portion of tears repaired today is about 10%. They expected this to grow, but they thought the portion in the future would still be limited to about 15%. Unsuccessful repairs, about 10-20%, require a second procedure, either another repair or a meniscectomy.
Surgeons said that meniscus repair is considerably more technically demanding than partial meniscectomy. They also said there are wide differences in surgeon skills for this procedure, so having a highly experienced surgeon is important.