C4 constant vertebra: a novel benchmark of physiological cervical sagittal alignment.
Haocheng XuZhaoyang GongYong YangFan ZhangFei ZouXinlei XiaXiaosheng MaFeizhou LyuJianyuan JiangHongli WangPublished in: European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society (2024)
In the asymptomatic population, the C4 vertebral body maintains a constant slope angle under physiological conditions. The novel concept of C4 as a constant vertebra would provide a vital benchmark for diagnosing pathological sagittal alignment abnormalities and planning the surgical reconstruction of cervical lordosis.