Development, Piloting and Evaluation of an Evidence-based Informed Consent Form for Total Knee Arthroplasty

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

UNKNOWN

Total Enrollment

220 participants

Study Classification

OBSERVATIONAL

Study Start Date

2021-03-22

Study Completion Date

2023-03-31

Brief Summary

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Every medical intervention requires informed consent. Informed consent may include comprehensible information about the necessity and kind of the intervention, material risks and consequences or alternative treatments. Practitioners frequently use consent forms to support the physician-patient conversation and to document informed consent. Studies show, that informed consent forms used in practice, are heterogeneous.

This study aims at investigating the effects of evidence-based informed consent forms for Total Knee Replacement and related anaesthesia procedures.

Evidence-based informed consent forms include best and latest evidence in lay language. It is hypothesized that evidence-based informed consent forms - compared to standard consent forms - improve patients' risk perception, reduce anxiety of complications and reduce the nocebo effect (unspecific negative effects caused by the way of communicating risks).

To compare evidence-based and standard informed consent forms, an Interrupted Time Series pilot study will be conducted. It is planned to include 220 patients, who are scheduled for elective total knee replacement surgery.

The accompanying qualitative analyses ensure that the (German) legal requirements for informed consent are met.

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Detailed Description

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Conditions

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Consent Forms Osteoarthritis, Knee Arthroplasty, Replacement, Knee

Study Design

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Observational Model Type

OTHER

Study Time Perspective

PROSPECTIVE

Study Groups

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Intervention group (post-interruption)

Patients receive evidence-based informed consent forms for total knee arthroplasty and related anaesthesia procedures

evidence-based informed consent form

Intervention Type OTHER

Evidence-based informed consent forms for total knee arthroplasty and related anesthesia procedures will be developed. The design of the evidence-based informed consent forms will be guided by an existing guideline on how to present evidence-based health information (guideline evidence-based health information) and nocebo research. The information will be presented in plain language. Benefits and harms of the procedures will be presented in absolute risk formats and in comparison with other interventions or placebo. Verbal presentations of risks lead to overestimations of risks and therefore, will not be applied exclusively. Gain and loss framing will be combined. To visualize important aspects, pictograms will be used. Information on uncertainty, missing or low quality evidence will be provided.

Control group (pre-interruption)

Patients receive standard consent forms (of the study centre) for total knee arthroplasty and related anaesthesia procedures

No interventions assigned to this group

Interventions

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evidence-based informed consent form

Evidence-based informed consent forms for total knee arthroplasty and related anesthesia procedures will be developed. The design of the evidence-based informed consent forms will be guided by an existing guideline on how to present evidence-based health information (guideline evidence-based health information) and nocebo research. The information will be presented in plain language. Benefits and harms of the procedures will be presented in absolute risk formats and in comparison with other interventions or placebo. Verbal presentations of risks lead to overestimations of risks and therefore, will not be applied exclusively. Gain and loss framing will be combined. To visualize important aspects, pictograms will be used. Information on uncertainty, missing or low quality evidence will be provided.

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* Patients are scheduled for an elective total knee arthroplasty surgery
* Patients are at least 18 years old
* Patients are able to understand and speak German
* Patients are mentally competent to give consent and answer questions