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Fig. 1 | BMC Surgery

Fig. 1

From: The clinical efficacy of laminectomy fusion fixation and posterior single open-door laminoplasty in the treatment of multilevel cervical ossification of the posterior longitudinal ligament (OPLL): a retrospective study

Fig. 1

The cervical ROM mainly by taking dynamic X-ray film of cervical spine and measuring C2-7 Cobb Angle in flexion and hyperextension respectively. A. illustrates the schematic representation of CCI. The extent of postoperative CCI loss directly correlates with the quality of cervical curvature preservation; B. the diagram showcases the Cervical Sagittal Balance Index (C2-7 SVA) and the K-line. The deterioration in C2-7 SVA, calculated as the difference between postoperative and preoperative values, reflects a decline in sagittal balance within the cervical spine; Moving on to Pictures C and D, these diagrams depict the Range of Motion (ROM). The flexion angle, denoted as β, takes a negative value if the cervical spine exhibits a reverse curvature. Conversely, the hyperextension angle, labeled as α, contributes to the overall ROM, which can be calculated as ROM = α + β. The angle of loss is determined by the difference between preoperative and postoperative ROM values

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BMC Surgery

ISSN: 1471-2482

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