Dove J, Hsu L C, Yau A C
Spine (Phila Pa 1976). 1982 Sep-Oct;7(5):408-11. doi: 10.1097/00007632-198209000-00002.
In order to determine the long-term consequences of avascular necrosis of the dens following halo-pelvic traction, 83 patients who had had their halo-pelvic apparatus removed at least five years previously were studied. Avascular necrosis of the dens was found in 31 patients (37%) within one year of removal of the apparatus, but after a minimum of five years the early bony changes had resolved and there was no evidence of atlantoaxial instability. However, 19% of patients who had had avascular necrosis had moderate or severe neck symptoms.
为了确定头环骨盆牵引后齿状突缺血性坏死的长期后果，对83例至少在5年前已拆除头环骨盆固定装置的患者进行了研究。在拆除装置后的1年内，31例患者（37%）出现了齿状突缺血性坏死，但至少5年后，早期骨质改变已消退，且没有寰枢椎不稳定的证据。然而，曾发生缺血性坏死的患者中有19%出现了中度或重度颈部症状。
