The Conceptualization and Derivation of the Cervical… : Spine
Yilgor and colleagues developed the lumbar Lordosis Distribution Index to individualize the pelvic mismatch to each patient’s pelvic incidence. The cervical lordosis distribution in relation to its apex has not been characterized. Patients and Methods. Cervical deformity patients with complete 2Y data were included. The optimal outcome is defined by no distal junctional failure (DJF), and meeting “good clinical outcome (GCO)” criteria by Virk and colleagues: [meeting 2 of 3: (1) a Neck Disability Index <20 or meeting minimally clinically important difference, (2) modified Japanese Orthopedic Association ≥14, (3) an Numerical Rating Scale–neck ≤5 or improved by 2 or more points]. C2-T2 lordosis was divided into cranial (C2 to apex) and caudal (apex to T2) arches postoperatively. A CLDI was developed by dividing the cranial lordotic arch (C2 to apex) by the total segment (C2-T2) and multiplying by 100. Cross-tabulations developed categories for CLDI producing the highest χ2 values for ac
