Which structure connects bone to bone?

• A. Ligament
• B. Tendon
• C. Cartilage
• D. Bone Marrow

Answer: (A)

Ligaments connect bone to bone across joints, providing stability while allowing controlled movement. They are bands of dense connective tissue rich in collagen that hold bones in proper alignment and help prevent dislocations. This distinguishes them from tendons, which attach muscle to bone to transmit force for movement. Cartilage, on the other hand, covers ends of bones in joints to create a smooth, low-friction surface and absorb shock, but it doesn’t link bones together across the joint. Bone marrow resides inside bone cavities and is involved in producing blood cells, not connecting bones. In many joints, ligaments like those in the knee (ACL, MCL, and others) act as key stabilizers to limit excessive motion.