| Subsidence of Stand-Alone Cervical Cages(RABEA) in Anterior Interbody Fusion: Implantable metalic cages, RABEA without cancellous bone graft, do not prevent subsidence |
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Kwang-Wook Cho, M.D.2, Young-Min Han, M.D.1, Jong-Tae Kim, M.D.1, Seung-Won Kwak, M.D.1, Ik-Sung Park, M.D.2, Dong-Sup Chung, M.D.1 and Young-Sup Park, M.D1. |
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Department of Neurosugery, Our Lady of Mercy Hospital1, Holy Family Hospital2, College of Medicine, The Catholic University of Korea, Incheon, Korea |
| 경추체간 융합술시 금속 삽입물(RABEA Cage)의 침강: 해면 골편의 충전 없는 금속 삽입물(RABEA Cage)은 침강 현상을 막지 못한다 |
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조광욱2, 한영민1, 김종태1, 곽승원1, 박익성2, 정동섭1, 박영섭1 |
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가톨릭대학교 의과대학 성모자애병원 신경외과1, 성가병원 신경외과2 |
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| Abstract |
Mean follow-up period was 3.7짹0.3 years. Clinical results were assessed based on the Odom's criteria.
Results
Clinical results according to the Odom's criteria were exellent and good in 11 patients(73%). Complete subsidence of the cage into the vertebral body was demonstrated on the plain radiograph in four patients(27%). Among them, three patients showed fair results and the other one showed good. Preoperatively, the mean height of the disc space(짹standard deviation) was 3.68짹0.92mm(range 2.5節5.5mm), and at 1 day postoperatively it was 7.96짹0.63mm(range 7.0節9.0mm). The mean height of the disc space after 1 year was 5.6짹1.5mm(range 1.5節7.5mm). All patients showed no abnormal move- ments on flexion and extension lateral film after 7 months. The mean height of the disc space was 3.9짹2.1mm(range 0節7mm), 2 years post-surgery and 3.0짹1.9mm(range 0節5mm), 3 years postoperatively.
Conclusion
Subsidence of the cage occurred in all cases. However, it was not directly related to the outcomes in a early postoperative period( <2 years). At a longer follow-up examination, subsidence seems to be a potential risk factor for recurrence of the symptoms and poor outcome. Clinical and radiological findings are similar with those of the patients who performed cervical discectomy without fusion, at least 3 years after operation. |
| Keywords:
Stand-alone cage, Subsidence, Cervical spine |
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