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Journal of Korean Neurosurgical Society 2004;35(5): 483-486.
Effect of PDN(R)(Prosthetic Disc Nucleus) on the Mobility and Height of the Intervertebral Disc: Preliminary Report.
Sang Ho Lee, Dong Yun Kim, Chan Shik Shim, Won Chul Choi, Gun Choi, Ho Yeon Lee
Department of Neurosurgery, Wooridul Spine Hospital, Seoul, Korea.
The purpose of the current study is to investigate the effect of the prosthetic disc nucleus replacement on the mobility and height of the intervertebral disc and adjacent segments. METHODS: Thirteen patients who underwent L4-L5 prosthetic disc nucleus replacement were included in this study. A retrospective review of clinical and radiological data was conducted. The L4-L5 disc height and sagittal rotation angle of L3-L4, L4-L5, L5-S1 were measured in the static and dynamic lateral radiographs pre- and postoperatively. RESULTS: There were seven men and six women whose mean age was 37 years(range, 24-49 years). The mean follow-up period was nine months(range, 6-14 months). In all cases the L4-L5 motion segment demonstrated angular motion between flexion and extension with a mean of 4degrees(+/-2.3degrees) of sagittal rotation angle. The disc height increased from preoperative levels by 117%. There was no difference in angular motion of adjacent segments between pre- and postoperative data. CONCLUSION: The prosthetic disc nucleus replacement after discectomy is shown to restore the disc height and maintain segmental mobility.
Key Words: Lumbar spine; Degenerative disc disease; Prosthetic disc nucleus
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