<Tr> <Th> FMA </Th> <Td> 44600 </Td> </Tr> <Tr> <Td_colspan="2"> Anatomical terminology (edit on Wikidata) </Td> </Tr> <P> The medial collateral ligament (MCL), or tibial collateral ligament (TCL), is one of the four major ligaments of the knee . It is on the medial (inner) side of the knee joint in humans and other primates . Its primary function is to resist valgus forces on the knee . </P> <Table> <Tr> <Td> </Td> <Td> This section does not cite any sources . Please help improve this section by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2015) (Learn how and when to remove this template message) </Td> </Tr> </Table>

What is the function of the medial collateral ligament