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J Korean Neurosurg Soc. 2004 Oct;36(4):291-296. English. Original Article.
Lee KY , Kim TS , Koh JS , Lim YJ , Kim GK , Rhee BA .
Department of Neurosurgery, School of Medicine, Kyung-Hee University, Seoul, Korea.

OBJECTIVE: The purpose of this study is to evaluate the safety and efficacy of cervical interbody fusion with implantable titanium cage(RABEA(TM)). The authors retrospectively analysis the result of application of cervical hollow cage(RABEA(TM)) without bone graft to the patients of degenerative cervical disease. METHODS: 78 patients with radiculopathy with or without myelopathy due to degenerative cervical diseases were underwent anterior cervical discectomy and interbody fusion with titanium cages(RABEA(TM)) which were not filled with autogenous bone from June 1999 to December 2002. Among them, 33 patients could be followed-up for at least 6 months. Mean follow-up period was 13.3 months(ranged 6-30 months). RESULTS: Good or excellent results were found in approximately 82.0%. Preoperatively, the mean height of the disc space was 4.27mm(range 3~6mm), and at 1 day postoperatively it was 7.87mm(range 7~9mm). The mean height of the disc space after 1 year was 6.07mm(range 1~8mm). Due to subsidence of cage, 7 patients showed decrease of disc space height to preoperative disc space height. Among them, 1 patients showed poor results. A solid fusion was achieved in all patients. In this context, causes of subsidence are represented by osteoporosis and degree of cage recess. CONCLUSION: Titanium cages appear safe and effective in the treatment of degenerative cervical disease. But subsidence of cage, so far limited in number, appeared to be important risk factor for recurrence of the symptoms.

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