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Motion in the adjacent segments is increased postoperatively
21%
23/108
Adjacent segment disease increases more with a two-level fusion than a single-level fusion
47%
51/108
Preoperative adjacent segment disease status is the most reliable predictor of postoperative disease
26%
28/108
Cervical arthroplasty reliably decreases adjacent segment disease
4%
4/108
The cephalad adjacent segment will deteriorate faster than the caudad one
2%
2/108
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There is some controversy as to whether or not anterior cervical fusion promotes or mitigates the development of adjacent segment disease. In the study below, the authors took patients undergoing cervical discectomy and fusion, had a preoperative dynamic fluoroscopic study performed on them, followed by imaging at regular intervals after surgery. The patients were then imaged at regular intervals after surgery. Results showed that on average there was no difference between preop and postop motion for shear, flexion-extension or vertical displacement of the anterior or posterior disc space. This argues that the preoperative status of the adjacent segment is an important predictor of postoperative status after a cervical diskectomy and fusion. There is insufficient evidence in the literature supporting the other answers.
2.5
(2)
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