=====Ranawat classification=====
Cervical spondylotic myelopathy

Class I

Pain, no neurological deficit

Class II

Subjective weakness, hyperreflexia, dysesthesias

Class III

Objecive weakness, long-tract signs

Class IIIa

Ambulatory

Class IIIb

Non-ambulatory
((Spinal Disorders: Fundamentals of Diagnosis and Treatment. Ed. Norbert Boos, Max Aebi. Springer, 2008.)).