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Radiologically documented adjacent-segment degeneration after cervical arthroplasty: characteristics and review of cases

 Seong Yi  ;  Dong Yeob Lee  ;  Poong Gee Ahn  ;  Keung Nyun Kim  ;  Do Heum Yoon  ;  Hyun Chul Shin 
 SURGICAL NEUROLOGY , Vol.72(4) : 325-329, 2009 
Journal Title
Issue Date
Adult ; Arthroplasty/adverse effects* ; Arthroplasty/instrumentation ; Arthroplasty/methods ; Calcinosis/diagnostic imaging ; Calcinosis/etiology ; Calcinosis/pathology ; Cervical Vertebrae/diagnostic imaging ; Cervical Vertebrae/pathology ; Cervical Vertebrae/surgery ; Diskectomy/adverse effects* ; Diskectomy/instrumentation ; Diskectomy/methods ; Female ; Humans ; Intervertebral Disc/diagnostic imaging ; Intervertebral Disc/pathology ; Intervertebral Disc/surgery ; Intervertebral Disc Displacement/diagnostic imaging ; Intervertebral Disc Displacement/pathology ; Intervertebral Disc Displacement/surgery* ; Male ; Middle Aged ; Postoperative Complications/etiology* ; Postoperative Complications/physiopathology ; Postoperative Complications/prevention & control ; Prostheses and Implants/adverse effects ; Retrospective Studies ; Secondary Prevention ; Spinal Osteophytosis/diagnostic imaging ; Spinal Osteophytosis/etiology ; Spinal Osteophytosis/pathology ; Spondylosis/diagnostic imaging ; Spondylosis/pathology ; Spondylosis/surgery* ; Tomography, X-Ray Computed
Adjacent-segment degeneration ; Arthroplasty ; Bryan disk ; Cervical ; Heterotopic ossification
BACKGROUND: the authors retrospectively studied the incidence and characteristics of radiologically documented adjacent-segment degeneration after single-level diskectomy and subsequent cervical arthroplasty using the Bryan (Medtronic Sofamor Danek; Memphis, TN) disk prosthesis.

METHODS: Seventy-two patients with single-level arthroplasty using the Bryan cervical disk prosthesis were evaluated. Radiological evidence of adjacent-disk disease included new formation or enlargement of anterior osteophyte, new or increasing ALL calcification, or narrowing of disk space documented on serial plain radiographs. We reported the characteristics of adjacent-segment degeneration and reviewed all of the cases.

RESULTS: Among the 72 patients, 9 patients (12.5%) showed radiological evidence of adjacent-segment degeneration. the mean age was 43.3 years old, with a male-female ratio 1:3. the mean follow-up period was 24.2 (12.1-35.9) months. the mean period of onset was 16.3 months. Upper-segment degeneration was documented in 4 cases (3 new osteophyte, 1 enlargement of osteophyte), whereas lower-segment degeneration was noted in 5 cases (1 new osteophyte, 3 enlargement of osteophyte, 1 decreased disk height). Among the degenerated cases, 4 cases (44.4%) also showed various degrees of HO.

CONCLUSIONS: the rate of adjacent-segment degeneration was higher than that observed in previous studies. Adjacent-segment degeneration documented a tendency toward HO. A longer follow-up period is necessary to investigate and document the different types of degeneration seen at levels adjacent to artificial Bryan cervical disk prostheses.
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1. College of Medicine (의과대학) > Dept. of Neurosurgery (신경외과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Keung Nyun(김긍년)
Shin, Hyun Chul(신현철)
Ahn, Poong Gee(안풍기)
Yoon, Do Heum(윤도흠) ORCID logo https://orcid.org/0000-0003-1452-5724
Lee, Dong Yup(이동엽)
Yi, Seong(이성)
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