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Fig. 1 | Journal of Orthopaedic Surgery and Research

Fig. 1

From: Prediction of the risk of C5 palsy after posterior laminectomy and fusion with cervical myelopathy using a support vector machine: an analysis of 184 consecutive patients

Fig. 1

Radiographic evaluation. a CCI on cervical spine X-rays. CCI: Line x is the distance between the posterior inferior points of C2 and C7. The distances between the posterior inferior points of C3–C6 and line L are called a1 to a4, respectively. The CCI is computed by the following formula: CCI = (x1 + x2 + x3 + x4)/L × 100%. When posterior inferior points of C3–C6 are behind line L, the values of x1 to x4 are negative. b C2-7 SVA on cervical spine X-rays. The distance between the center point through C2 and the vertical line of the posterosuperior corner of C7 was defined as C2–C7 SVA. c Modified Pavlov ratio on sagittal T2-weighted MRI. Pavlov ratio (= D1/D2, vertebral body spinal canal ratio). d Presence of protruding lesions at the anterior portion of the spinal cord. e Foraminal stenosis between C4 and C5 on axial CT image. The yellow arrows indicate foraminal dimension

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