Abstract
The aim of this study was to comprehensively compare the clinical and biomechanical efficiency of anterior cervical discectomy and fusion (ACDF) with anterior cervical disc replacement (ACDR) for treatment of multilevel cervical disc disease using a meta-analysis and systematical review. A literature search was performed using PubMed, MEDLINE, EMBASE, and the Cochrane Library for articles published between January 1960 and December 2017. Both clinical and biomechanical parameters were analyzed. Statistical tests were conducted by Revman 5.3. Nineteen studies including 10 clinical studies and 9 biomechanical studies were filtered out. The pooled results for clinical efficiency showed that no significant difference was observed in blood loss (P= 0.09; mean difference [MD], 7.38; confidence interval [CI], -1.16 to 15.91), hospital stay (P= 0.33; MD,-0.25; CI,-0.76 to 0.26), Japanese Orthopaedic Association scores (P= 0.63; MD,-0.11; CI,-0.57 to 0.34), visual analog scale (P= 0.08; MD,-0.50; CI,-1.06 to 0.05), and Neck Disability Index (P= 0.33; MD,-0.55; CI,-1.65 to 0.56) between the 2 groups. Compared with ACDF, ACDR did show increased surgical time (P= 0.03; MD, 31.42; CI, 2.71-60.14). On the other hand, ACDR showed increased index range of motion (ROM) (P < 0.00001; MD, 13.83; CI, 9.28-18.39), lower rates of adjacent segment disease (ASD) (P= 0.001; odds ratio [OR], 0.27; CI, 0.13-0.59), complications (P= 0.006; OR, 0.62; CI, 0.45-0.87), and rate of subsequent surgery (P < 0.00001; OR, 0.25; CI, 0.14-0.44). As for biomechanical performance, ACDR maintained index ROM and avoided compensation in adjacent ROM and tissue pressure. Multilevel ACDR may be an effective and safe alternative to ACDF in terms of clinical and biomechanical performance. However, further multicenter and prospective studies should be conducted to obtain a stronger and more reliable conclusion.
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