Thanks for your reply!

A P and R stand for Active, Passive and Resisted Ranges of Movement. My friend who has had the samething had a Wikipedia reference-linkMRI Scan which showed no signs of any tears.

Is it possible that the knee has become slightly unstable, enough for there to be space for the medial Wikipedia reference-linkmeniscus to partially be out of the joint capsule? I can't understand how this can be!?