Does a displcement of the meniscal root mean that there is a tear? Where is the articular cartilage in the knee? What is the purpose of having that?

Meniscus - surgery. You are quoting detailed anatomy inside the knee, likely from an MRI report. It describes a tear in the meniscus cartilage, which lines the inside of the knee so bones can glide against each other smoothly. This usually needs surgery to correct, but the surgery can be done through a tiny incision with a scope. Find more info @ http://orthoinfo.Aaos.Org/topic.Cfm?Topic=a00358.