Abstract

BackgroundObservational studies have previously shown that adverse events following manipulation to the neck and/or back are relatively common, although these reactions tend to be mild in intensity and self-limiting. However, no prospective study has examined the incidence of adverse reactions following spinal adjustments using upper cervical techniques, and the impact of this care on clinical outcomes.MethodsConsecutive new patients from the offices of 83 chiropractors were recruited for this practice-based study. Clinical outcome measures included 1) Neck pain disability index (100-point scale), 2) Oswestry back pain index (100-point scale), 3) 11-point numerical rating scale (NRS) for neck, headache, midback, and low back pain, 4) treatment satisfaction, and 5) Symptomatic Reactions (SR). Data were collected at baseline, and after approximately 2 weeks of care. A patient reaching sub-clinical status for pain and disability was defined as a follow-up score <3 NRS and <10%, respectively. A SR is defined as a new complaint not present at baseline or a worsening of the presenting complaint by >30% based on an 11-point numeric rating scale occurring <24 hours after any upper cervical procedure.ResultsA total of 1,090 patients completed the study having 4,920 (4.5 per patient) office visits requiring 2,653 (2.4 per patient) upper cervical adjustments over 17 days. Three hundred thirty- eight (31.0%) patients had SRs meeting the accepted definition. Intense SR (NRS ≥8) occurred in 56 patients (5.1%). Outcome assessments were significantly improved for neck pain and disability, headache, mid-back pain, as well as lower back pain and disability (p <0.001) following care with a high level (mean = 9.1/10) of patient satisfaction. The 83 chiropractors administered >5 million career upper cervical adjustments without a reported incidence of serious adverse event.ConclusionsUpper cervical chiropractic care may have a fairly common occurrence of mild intensity SRs short in duration (<24 hours), and rarely severe in intensity; however, outcome assessments were significantly improved with less than 3 weeks of care with a high level of patient satisfaction. Although our findings need to be confirmed in subsequent randomized studies for definitive risk-benefit assessment, the preliminary data shows that the benefits of upper cervical chiropractic care may outweigh the potential risks.

Highlights

  • Observational studies have previously shown that adverse events following manipulation to the neck and/or back are relatively common, these reactions tend to be mild in intensity and self-limiting

  • Previous observational studies have shown that adverse events (AE) following spinal manipulative therapy (SMT) applied to the neck and/or back are relatively common, these reactions tend to be mild in intensity and self-limiting [1,2,3,4,5,6]

  • The United States was represented by 70 chiropractors from 29 states, and Canada had 11 doctors representing three provinces

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Summary

Introduction

Observational studies have previously shown that adverse events following manipulation to the neck and/or back are relatively common, these reactions tend to be mild in intensity and self-limiting. No prospective study has examined the incidence of adverse reactions following spinal adjustments using upper cervical techniques, and the impact of this care on clinical outcomes. Previous observational studies have shown that adverse events (AE) following spinal manipulative therapy (SMT) applied to the neck and/or back (i.e., local discomfort in treatment area, radiating symptoms, headache) are relatively common, these reactions tend to be mild in intensity and self-limiting [1,2,3,4,5,6]. Some studies have looked at cervical SMT and the relationship of this care to AEs and clinical outcome measures. One study found that the use of cervical rotation with SMT, and a patient’s work status were moderately associated with an increased incidence of AEs [14]

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