Congenital
Achondroplasia
SED
Polynesians (trefoil)
Prematurity
Osteopetrosis
Acquired
Degenerative discs
Spondylolisthesis
Kyphosis
Trauma
Iatrogenic
- post laminectomy
Miscellaneous
- Paget's
- AS
- DISH
- Fluorosis
Tumour
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