Don't know about the meniscus, but I think the other bit means that you have some sort of early stage softening to the articular cartilage in the medial (inside), lateral (outside) and patella areas of your knee. There are different grades of damage (1-4) - have a look at the arthritis section in the information hub where this is explained
You need to discuss the report properly with your doctor - the ACL and meniscus may need surgical attention (although I think you may have asked about this elsewhere?)