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P02.90. Equivalence of doctor interactions between Activator Methods and sham chiropractic protocols during an expertise-based randomized clinical trial


One objective of the expertise-based randomized controlled trial portion of a current developmental center grant is to determine which of three control groups would be most appropriate for a larger scale study concerning the effectiveness of Activator Methods chiropractic technique (AMCT) for temporomandibular disorders. A video evaluation instrument was developed to assess the equivalence of doctor interactions with participants in the active and sham AMCT groups.


One doctor of chiropractic (DC) delivered the chiropractic intervention to the active and sham AMCT groups while being video recorded. The evaluation instrument codified DC communications into 4 domains: therapeutic (information seeking, explanations), procedural (directions, cautions, logistics), effectiveness (optimistic, pessimistic, neutral), and affective (social, name use) interactions. Activator Adjusting Instrument (AAI) clicks, encounter duration, touch orientation, and evaluator assessment of treatment group were documented. A trained video evaluator, blinded to treatment group, coded 34 active and 30 sham treatment videos by placing a hash mark in the appropriate category for each interaction. Descriptive statistics included medians and interquartile ranges.


DC-initiated verbal communications were similar between active and sham AMCT in the procedural and affective domains. Notable differences were observed in the medians of the number of DC-initiated verbal communications between active and sham AMCT sessions in the therapeutic and effectiveness domains. More AAI clicks were recorded for active (42) vs sham (22) AMCT. Encounter duration also differed between active and sham AMCT (13 vs 11 minutes). The video evaluator correctly identified 66% of active AMCT, but only 31% of sham sessions.


Definitive conclusions about how differences in DC behaviors may have impacted study results cannot be drawn until we have completed data analysis for the primary endpoint. Investigators may want to consider adding this type of analysis in manual therapies when sham or other control groups are used.

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This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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DeVocht, J., Salsbury, S., Seidman, M. et al. P02.90. Equivalence of doctor interactions between Activator Methods and sham chiropractic protocols during an expertise-based randomized clinical trial. BMC Complement Altern Med 12 (Suppl 1), P146 (2012).

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  • Manual Therapy
  • Information Seek
  • Evaluation Instrument
  • Sham Treatment
  • Temporomandibular Disorder