Fig. 1From: Retrospective exploration of risk factors for L5 radiculopathy following lumbar floating fusion surgeryRadiographic parameters. a L5-S1 wedging angle in a frontal standing plain X-ray. b Disc height of L5-S1 intervertebral disc: h = (h1 + h2) × 1/2. c Foraminal ratio: bilateral L5-S1 foraminal ratio of the narrower to the wider foraminal craniocaudal diameterBack to article page