What are the symptoms of a displaced meniscus? is a displacement the same as a medial extrusion? please explain

Meniscal tears: A displaced meniscus tear can cause clicking, catching, and locking. A displaced tear may be displaced into the center of the joint which will be more symptomatic. An extruded meniscus is displaced out of the joint and itself does not cause pain but the joint space narrowing can cause pain. Removal or meniscectomy of an extruded meniscus usually does not relieve pain.