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Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
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Related Experiment Video

Updated: Aug 16, 2025

Author Spotlight: Improving Percutaneous Vertebroplasty Surgical Accuracy and Efficiency Through Advanced Puncture Techniques
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Author Spotlight: Improving Percutaneous Vertebroplasty Surgical Accuracy and Efficiency Through Advanced Puncture Techniques

Published on: August 9, 2024

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Understanding explanatory and pragmatic trials: Examples from randomized controlled trials on vertebroplasty.

J Eneling1, T E Darsaut2, M Patel2

  • 1Department of radiology, service of neuroradiology, centre hospitalier de l'université de Montréal (CHUM), Montreal, Quebec, Canada.

Neuro-Chirurgie
|December 25, 2022
PubMed
Summary

Understanding the explanatory-pragmatic distinction is crucial for interpreting randomized controlled trials (RCTs). Inconsistent design choices can lead to ambiguous results, particularly in percutaneous vertebroplasty studies.

Keywords:
Explanatory trialOsteoporotic vertebral compression fracturesPRECIS toolPragmascopePragmatic trialTrial methodologyVertebroplasty

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Area of Science:

  • Clinical Trials Methodology
  • Evidence-Based Medicine
  • Health Research Design

Background:

  • The explanatory-pragmatic distinction guides the design and interpretation of randomized controlled trials (RCTs).
  • Percutaneous vertebroplasty for osteoporotic vertebral compression fractures is a key area for evaluating trial design.
  • Ambiguity in RCT results can arise from inconsistent application of design principles.

Approach:

  • Reviewed the literature on the explanatory-pragmatic distinction in clinical trial design.
  • Utilized the PRECIS-2 tool to assess the design of selected RCTs on percutaneous vertebroplasty.
  • Analyzed challenges in criterion selection and PRECIS diagram construction.
  • Examined how design inconsistencies impact result interpretation.

Key Points:

  • PRECIS-2 tool application revealed subjective criterion selection and debatable scoring.
  • Heterogeneous pragmascope patterns were observed across vertebroplasty trials.
  • Many trials exhibited both pragmatic and explanatory elements, complicating interpretation.
  • Placebo-controlled trials with explanatory goals but pragmatic designs yielded ambiguous negative results.

Conclusions:

  • Interpreting RCT results necessitates a thorough understanding of design choices along the explanatory-pragmatic spectrum.
  • The PRECIS-2 tool aids in evaluating trial design but requires careful application.
  • Clearer reporting of design choices is essential for robust clinical trial interpretation.