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Objective To reveal the relation between alignments of upper and subaxial cervical spine and deduce the optimal atlantoaxial fusion angle by a radiological study. Methods 414 asymptomatic volunteers (213 males, 201 females) underwent cervical lateral radiographs in neutral position. The Oc–C2 angle, C1–C2 angle and C2–C7 angle were measured. Relations among these three angles and relations between...
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