Stability to the tibiofemoral joint is provided by several ligaments:
Medial collateral ligament (MCL) - prevents lateral movement of the tibia on the femur when valgus (away from the midline) stress is placed on the knee. Runs between the medial epicondyle of the femur and the anteromedial aspect of the tibia. Also has a deep attachment to the medial meniscus.
This is a companion discussion topic for the original article at https://patient.info/doctor/orthopaedics/knee-ligament-injuries-pro