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    Sham Control

    Placebo-equivalent for device trials - a non-therapeutic procedure that mimics the investigational intervention.

    Reviewed by Christian Espinosa, Founder, Blue Goat CyberLast reviewed May 5, 2026

    Definition

    Sham controls are used when blinding is feasible (e.g., neurostimulator off-state, sham endoscopic procedures) and ethical, providing the strongest control against placebo effects. A sham procedure imitates the experience of treatment without the active element, for example an inactive stimulation or a procedure without the therapeutic step. Because shams can carry procedural risk, ethics committees weigh their justification closely. Renal denervation trials are a well known example where sham-controlled designs changed conclusions reached in earlier open-label studies.
    What the regulation says
    Regulatory bodies like the FDA recognize sham controls as a robust method for evaluating medical devices, especially when blinding is achievable and ethically sound. The FDA guidance "Considerations for the Design and Conduct of Externally Controlled Trials of Medical Devices" discusses the appropriate use of controls, including sham controls, to minimize bias and demonstrate device effectiveness. Similarly, ISO 14155, Clinical investigation of medical devices for human subjects - Good clinical practice, outlines principles for clinical investigations, including control group selection, to ensure scientific validity and protect subjects.

    What this means in practice

    Sham-controlled device trials raise ethics, IRB, and patient acceptance challenges; FDA has issued specific guidance on appropriate use.

    Examples

    • A trial for a novel pain relief device might use a sham control device that looks identical but delivers no therapeutic energy.
    • In a study of a surgical implant, the sham control group might undergo a similar surgical procedure without the actual active implant.
    • A clinical investigation for an ophthalmic device may involve a sham procedure where patients receive an inactive intervention that mimics the active treatment.
    Common pitfalls
    • •Sham controls must be ethically justifiable, ensuring that withholding the active treatment does not pose undue risk to participants.
    • •Designing an effective sham control requires careful consideration to ensure it truly mimics the active intervention without providing therapeutic benefit.
    • •Patient recruitment can be challenging in trials utilizing sham controls due to the potential for participants to receive a non-therapeutic intervention.
    • •Failing to adequately blind participants or investigators to the sham control can introduce bias and compromise the study results.

    Frequently asked questions

    The primary purpose is to control for the placebo effect and other non-specific effects, providing a clearer understanding of the device's true therapeutic benefit.

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    Sources

    3 sources

    Sources support the definition or relevant regulatory context, not necessarily every claim on this page. Each is graded against our source-tier hierarchy so you can see what rests on binding law versus commentary.

    Tier 1Binding law and standards· 1Tier 2Regulator guidance and consensus· 2
    Link health: 3 verified· last checked 2026-06-20
    FDA·1ICH·1ISO·1
    1. 1
      FDA Sham Control Guidance
      Tier 2 Verified
      FDAfda.gov
    2. 2
      ICH Guidelines
      Tier 2 Verified
      ICHich.org
    3. 3
      ISO 14155 Standard Page
      Tier 1 Verified
      ISOiso.org

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