Comparison of single versus double door posterior cervical laminoplasty for patients with cervical spondylotic myelopathy: A systematic review and meta-analysis.

Objective: We undertook a meta-analysis to compare the efficacy and safety of single versus double door posterior cervical laminoplasty for cervical spondylotic myelopathy.
Methods: PubMed, Embase, and Cochrane Central Register of controlled trials were searched for randomized controlled trials investigating single and double door posterior cervical laminoplasty for cervical spondylotic myelopathy. The Mantel-Haenszel method with the fixed-effects or random-effects model was used to calculate relative risks and 95% confidence intervals (CIs).
Results: Seven studies with 224 patients met the eligibility criteria and were included. There was a significant difference in Japanese Orthopedic Association score (MD = 0.79, 95%CI [0.09, 1.49], P = .03; P for heterogeneity = .09, I = 45%), and adverse events (OR = 0.32, 95%CI [0.11, 0.95], P = .04; P for heterogeneity = 1.00, I = 0%) between the double door posterior cervical laminoplasty group and the single door posterior cervical laminoplasty group. There was no significance in operative time (MD = 0.56, 95%CI [-11.86, 12.98], P = .93; P for heterogeneity = 0.001, I = 73%) and length of hospital stay (OR = -0.75, 95%CI [-1.78, 0.27], P = .15; P for heterogeneity = 1.00, I = 0%) between the 2 groups.
Conclusion: Double door posterior cervical laminoplasty is more effective and safer than single door laminoplasty in the treatment of cervical spondylotic myelopathy.