The functions of bone, cartilage and ligament are as follows:
Bone
Bone provides shape and support to the body.
Protects vital body organs such as the brain, lungs, etc.
Bone anchors the skeletal muscles.
Cartilage
Cartilage provides support and flexibility to the body parts.
Ligament
The ligament connects bones to bones.
Ligaments strengthen the joint and permit normal movement but prevent over-flexing or over-extension.