A comparison of contiguous two-level anterior cervical discectomy and fusion using a structural allograft versus a Polyetheretherketone (PEEK) cage: the results of a three-year follow-up

摘要

The method for measuring disc height: the mean value of the anterior and posterior disc height at each level; the method for measuring segmental height: the distance between the middle margin of the upper end plate of the superior vertebral body and the lower end plate of the inferior vertebral body; the method for measuring segmental Cobb angle/lordosis: the angle formed by the upper endplate of the superior vertebrae body and the lower endplate of the inferior vertebrae body, while the patient is in a neutral position