The Surgical Treatment Principles of Atlantoaxial Instability Focusing on Rheumatoid Arthritis

Table 2

Ranawat classification of neurological deficit.

Ranawat classification
Class I	No neural deficit
Class II	Subjective weakness, dysesthesias, and hyperreflexia
Class IIIA	Objective weakness and long-tract signs; patient remains ambulatory
Class IIIB	Objective weakness and long-tract signs; patient no longer ambulatory