What ligament was most probably injured?

A young woman fell and hit her knee. Exam: valgus test +ve.

What ligament was most probably injured?
A . Lateral collateral
B . Ant cruciate
C . Post cruciate
D . Medial collateral
E . Meniscus

Answer: D

Explanation:

Medial collateral. The valgus stress test involves placing the leg into extension, with one hand place on the knee. With the other hand placed upon the foot applying an abducting force, an attempt is then made to at the knee into valgus. If the knee is seen to open up on the medial side, this is indicative of medial collateral damage.