Spinal manipulation, medication, or home exercise with advice for acute and subacute neck pain: a randomized trial.

Background: Mechanical neck pain is a common condition that affects an estimated 70% of persons at some point in their lives. Little research exists to guide the choice of therapy for acute and subacute neck pain. Objective: To determine the relative efficacy of spinal manipulation therapy (SMT), medication, and home exercise with advice (HEA) for acute and subacute neck pain in both the short and long term. Design: Randomized, controlled trial. (ClinicalTrials.gov registration number: NCT00029770) Setting: 1 university research center and 1 pain management clinic in Minnesota. Participants: 272 persons aged 18 to 65 years who had nonspecific neck pain for 2 to 12 weeks. Intervention: 12 weeks of SMT, medication, or HEA. Measurements: The primary outcome was participant-rated pain, measured at 2, 4, 8, 12, 26, and 52 weeks after randomization. Secondary measures were self-reported disability, global improvement, medication use, satisfaction, general health status (Short Form-36 Health Survey physical and mental health scales), and adverse events. Blinded evaluation of neck motion was performed at 4 and 12 weeks. Results: For pain, SMT had a statistically significant advantage over medication after 8, 12, 26, and 52 weeks (P <= 0.010), and HEA was superior to medication at 26 weeks (P = 0.02). No important differences in pain were found between SMT and HEA at any time point. Results for most of the secondary outcomes were similar to those of the primary outcome. Limitations: Participants and providers could not be blinded. No specific criteria for defining clinically important group differences were prespecified or available from the literature. Conclusion: For participants with acute and subacute neck pain, SMT was more effective than medication in both the short and long term. However, a few instructional sessions of HEA resulted in similar outcomes at most time points.