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  • Reoperation Rates after Anterior Cervical Discectomy and Fusion Versus Posterior Cervical Foraminotomy: A Propensity Matched Analysis

    Final Number:

    Daniel Lubelski; Andrew T Healy MD; Michael Silverstein; Michael P. Steinmetz MD; Edward C. Benzel MD; Thomas E. Mroz MD

    Study Design:

    Subject Category:

    Meeting: Congress of Neurological Surgeons 2014 Annual Meeting

    Introduction: Anterior cervical discectomy and fusion (ACDF) and posterior cervical foraminotomy (PCF) are both used to surgically treat patients with cervical radiculopathy, and have been shown to have similar outcomes. Nonetheless, ACDF has become increasingly more commonplace compared with PCF, in part because of a pervasive belief that PCF has a higher incidence of required reoperations.

    Methods: A retrospective review of the electronic medical records was performed to identify all patients that underwent ACDF and PCF for radiculopathy (excluding myelopathy indications) between January 2005 and December 2011. Revision surgery within 2 years, at the index level, was recorded. Propensity score analysis between the ACDF and PCF groups was utilized and matched the groups for age, gender, race, body mass index, tobacco use, median income and insurance status, primary surgeon, level of surgery, surgery duration, and length of hospital stay.

    Results: 790 patients met the inclusion/exclusion criteria, including 627 ACDF and 163 PCF. Prior to propensity matching, the PCF group was found to be significantly older, more likely to be male, and more likely to undergo surgery at C2 and C3. After matching, there were no significant differences between groups for any baseline characteristics. Reoperation rate at the index level was 4.8% for the ACDF group and 6.4% for the PCF group (p=0.7), within 2 years of the initial surgery. Using equivalence testing, based on an a priori null hypothesis that a clinically meaningful difference between the two groups would be =5%, we found that the absolute difference of 1.6% was significantly (p=0.01) less than our hypothesized difference.

    Conclusions: This study demonstrates that even after accounting for patient demographics, operative characteristics, and primary surgeon, there are no significant differences in 2-year reoperation rates at the index level between ACDF and PCF. In fact, the reoperation rates are statistically equivalent. Thus, spine surgeons can operate via the posterior approach to treat radiculopathy without putting patients at increased risk for revision surgery.

    Patient Care: This research will enable surgeons to utilize either ACDF or PCF for cervical radiculopathy, without fear of greater reoperation rates with the posterior approach. This will allow for better care and possibly reduced cost for patient and health care system.

    Learning Objectives: 1. To understand the historical considerations for choosing ACDF versus PCF to surgically treat cervical radiculopathy 2. To learn about the true reoperation rates, 2 years after surgery at the index level, for ACDF and PCF 3. To understand that after propensity matching for demographic and operative characteristics, to ensure no confounding of data, that there are no significant differences in reoperation after the two procedures


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