Block vertebrae is a congenital condition that happens when two or more of your vertebrae are fused together. Learn about symptoms, risk factors, treatment, and more.

There are 12 vertebrae in the thoracic spine, known as T1–T12. ... The coccyx is a small, triangular bone of three to five fused vertebrae. This bone sits below the sacrum.

Spinal fusion literally involves a fusion of two (or even more) vertebrae to limit motion between the specific vertebrae. The vertebrae can be fused together with bone grafts (from the hip bone or ...

Ankylosing spondylitis is a rare type of arthritis in your spine that most often affects people younger than 45. Learn more about symptoms, causes, risk factors, diagnosis, treatments, home ...