Diffuse Idiopathic Skeletal Hyperostosis (DISH) is a condition characterized by the formation of excessive bone along the ligaments of the spine and other parts of the skeleton. Unlike inflammatory conditions like ankylosing spondylitis, DISH does not involve joint inflammation but rather excessive bone growth, often leading to stiffness and reduced mobility. It is also called Forestier’s disease.
What Happens in DISH?
- Bone Overgrowth:
- The primary feature of DISH is the calcification and hardening (ossification) of ligaments, particularly in the spine. This leads to new bone formation along the sides of the vertebrae.
- Spinal Stiffness:
- As the ligaments harden and fuse with the bone, the spine becomes less flexible, especially in the mid-back (thoracic spine).
- Non-Inflammatory Process:
- Unlike arthritis, DISH is not caused by inflammation but by abnormal bone metabolism.