Fig. 3From: Laminoplasty with selective fusion at unstable segment versus laminectomy with fusion for multilevel cervical myelopathy: a case‐control studyThe C2-C7 Cobb (α) angle was defined as the angle between the line parallel to the inferior endplate of C2 and C7 (a). The cervical range of motion (ROM) was defined as the sum of C2-7 Cobb angles measured on flexion-extension lateral radiographs (b and c). ROM = β1 + β2Back to article page