Sarah presents with left lateral knee pain and has some locking in full extension. There is tenderness over the medial joint line. When the knee is extended with the foot externally rotated and some valgus stress is applied, a click is noted. What is the most likely diagnosis?

Answer is torn medial meniscus.

Explanation:

Menisci [ singular ; meniscus], are fibrocartilage strips that are found in the knee, and they act as shock absorber for the knee.

When the meniscus tear or rupture, it is being referred to as turn medial meniscus.

This injury have the tendency of healing on its own, when it occurred in the area of the knee where there is rich supply of rich supply of blood. This is because the blood cells can cause regeneration of the meniscus.

the other way of curing or healing the torn medial meniscus is by surgery.