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Schematic representation of anatomic landmarks and liner measurements for the determination of cervical vertebral morphology. (A) Two reference points (R1 and R2) and thirteen anatomic landmarks of C2, C3 and C4. The distance between the two reference points (R1 and R2) is 10 mm. (B) C2Conc = C2m − C2m′. (C) C3Conc = C3m − C3m′. (D) C3BAR = (C3lp − C3la)/(C3ua − C3la). (E) C4Conc = C4m − C4m′. (F) C4BAR = (C4lp − C4la)/(C4ua − C4la).
