Fig. 1

A Schematic illustration of slice selection on magnetic resonance imaging. Point A; Point at the center of the anteroposterior diameter of the anterior horn of the medial meniscus. Point B; Point at the center of the anteroposterior diameter of the posterior horn of the medial meniscus. Point M, the midpoint of line AB was designated as point M. Slice position 1 was represented as P1. B In each slice, MME from the tibial articular surface, excluding the osteophytes, was measured (*). The displacement of the medial meniscus from the margin of the medial tibial plateau was measured. A vertical line was drawn intersecting the outer margin of the medial tibial plateau. Medial meniscus extrusion was measured from this line to the outer edge of the medial meniscus