2. Facets

The facet joints connect the bones in the spine. Nerves from the spinal cord pass through the facets and out to the limbs and other parts of the body. The joints facilitate movement, too, allowing the body to turn from side to side and bend while keeping the back from moving too far. The cartilage helps the bones move smoothly against each other, which is why someone with facet arthropathy experiences so much pain.

Facet Spine Discs 1Photodiva / Getty Images

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