Cervical Collar Use After Single-Level ACDF
You will not need to wear a cervical collar after your single-level ACDF at C5-C6, as the evidence demonstrates no benefit in fusion rates or clinical outcomes when a collar is used after instrumented anterior cervical fusion. 1, 2
Evidence Against Routine Collar Use
The strongest and most recent evidence comes from multiple prospective randomized controlled trials specifically examining single-level and two-level instrumented ACDF:
A 2018 prospective randomized trial of 44 patients undergoing 1- or 2-level ACDF found no statistically significant difference in 1-year Neck Disability Index scores (9.30 with collar vs 6.95 without collar, P=0.28), fusion rates (89% with collar vs 97% without collar, P=0.37), or subsidence rates (0.85mm with collar vs 0.79mm without collar, P=0.72). 2
A 2009 FDA-regulated multicenter trial of 257 patients undergoing single-level ACDF with plating found that cervical bracing did not improve fusion rates or clinical outcomes at any time point up to 24 months postoperatively. 1
A 2018 systematic review using PRISMA methodology found no strong evidence to support cervical collar use after 1- and 2-level ACDF procedures, with no statistically significant difference in mean improvement in Neck Disability Index scores between collar and no-collar groups (P=0.86). 3
Why Collars May Actually Be Harmful
Emerging evidence suggests that postoperative collar use may worsen outcomes:
A 2021 multicenter study of 234 patients found that cervical collar use negatively influenced both early and late Neck Disability Index scores (P<0.0001), with patients wearing collars having a higher risk of early nonfusion (P=0.001). 4
The same study demonstrated that collar use significantly correlated with worse functional outcomes after ACDF, independent of other variables such as age, BMI, or number of levels fused. 4
The Role of Anterior Plating
Your surgeon will use an anterior cervical plate, which provides sufficient stability to eliminate the need for external immobilization:
Anterior cervical plating reduces pseudarthrosis risk from 4.8% to 0.7% in single-level procedures and improves fusion rates from 90% to 96% (P<0.05), making external bracing redundant. 5
The plate limits motion between the graft and vertebra, providing the mechanical stability that collars were historically thought to provide. 1
Practical Implications
Avoiding collar use after your surgery offers several advantages:
No impact on your ability to drive or return to work, which collars would otherwise delay. 3
No additional cost burden from purchasing and maintaining a cervical orthosis. 3
Faster return to normal activities of daily living without the psychological dependence that collars can create. 6
The One Exception
One small 2013 pilot trial (n=33) suggested that collars might reduce early postoperative neck pain and disability at 6 weeks, but this study was underpowered and contradicted by larger, higher-quality trials. 6 The weight of evidence from larger randomized trials and systematic reviews clearly demonstrates no benefit, and the most recent multicenter data shows potential harm. 2, 3, 4
Bottom Line
For your single-level instrumented ACDF at C5-C6, a cervical collar is not medically necessary and may actually impair your recovery. 1, 2, 3, 4 The anterior plate provides all the stability needed for successful fusion, and collar use offers no additional benefit while potentially worsening functional outcomes and delaying your return to normal activities. 5, 4