Fig. 3From: Analysis of a radiographic parameter K-line tilt following adjacent two-level anterior cervical discectomy and fusion: a retrospective studyThe linear regression model of follow-up K-line tilt and NDI scores showed that when K-line tilt was > 23.75°. NDI scores were > 25 (R2 = 0.737, p = 0.000). NDI, neck disability indexBack to article page