Table 1.

Etiology of cervical spine deformities

Etiology of deformities	No. of patients (n=33)
Arnold Chiari malformation	2
Basilar invagination	3
Os odontoideum	2
Atlanto-axial subluxation	4
Traumatic C1-2 instability	2
C1-2 rotary subluxation	2
Degenerative C1-2 arthritis	2
Rheumatoid C1-2 instability	1
Post-tubercular deformity/ instability	2
Degenerative sub-axial instability with stenosis	3
Traumatic sub-axial fractures	3
Cervical thoracic deformity	4
Cervical tumor excision	3