Alert

Knee ligaments

Ligaments are tough, ropy fibers that connect one bone to another. The four ligaments of the knee connect the upper leg bone (femur) to the lower leg bone (tibia) and stabilize knee movement.

  • The anterior cruciate ligament (ACL) and the posterior cruciate ligament cross inside the center of the knee joint and stabilize front-to-back knee movements.
  • The medial collateral ligament and the lateral collateral ligament connect the leg bones at the sides of the knee and stabilize side-to-side movements.

Symptom Checker

Feeling under the weather?

Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.

Interactive Tools

Get started learning more about your health!

Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.