I doubt you actually had your menisci repaired. What is more likely is that the damaged portion of the meniscus was removed. This is known as a partial meniscectomy and is far more common than a meniscus repair. In a 58 year old male, with arthritic changes, and overweight, a meniscus repair would not be the operation of choice.
Assuming you did have a partial meniscectomy, the value of a post surgical MRI is minimal since it is extremely difficult, if not impossible, to differentiate between post-surgical changes and a new tear. If indeed, you have torn into the remaining meniscus, the newly damaged portion can be removed with a second procedure.
So if you have torn for a second time within months of the first Operation of removal of 40% of the meniscus is it worth it to go in and removing the new tear? Can this happen again in another few months for a third time? Is there anything else that can be done? Please advise. I personally do not have the money to keep removing these tears... : )