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Randomized Experiments

Randomized Experiments

The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...

Blinding

Blinding

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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Randomised trial support for orthopaedic surgical procedures.

Hyeung C Lim¹, Sam Adie², Justine M Naylor³

¹Whitlam Orthopaedic Research Centre, Ingham Institute for Applied Medical Research, Liverpool, Australia.

|June 14, 2014

Summary

This summary is machine-generated.

Evidence supporting surgical interventions in orthopaedics is limited. Few randomised controlled trials (RCTs) demonstrate surgery

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Area of Science:

Orthopaedic Surgery
Evidence-Based Medicine
Clinical Trials

Background:

Orthopaedic procedures are frequently performed.
The evidence base supporting surgical interventions requires evaluation.

Purpose of the Study:

To determine the proportion of orthopaedic procedures supported by high-quality evidence from randomised controlled trials (RCTs).
To assess the level of evidence comparing operative versus non-operative treatments in orthopaedics.

Main Methods:

Analysis of orthopaedic procedure volumes from 2009-2011 at three teaching hospitals.
Searches of Cochrane databases (CENTRAL, CDSR, DARE) for RCTs on common orthopaedic procedures.
Categorization of RCTs as supportive or non-supportive of operative intervention.
Risk of bias assessment using the Cochrane Collaboration's tool.

Main Results:

Of 8,886 common orthopaedic procedures analyzed, only 22.9% of identified RCTs supported operative intervention.
36.9% of procedures had at least one RCT showing surgery superiority.
Only 19.6% of procedures were supported by low risk of bias RCTs favoring surgery.

Conclusions:

The evidence base supporting common orthopaedic procedures, particularly from high-quality RCTs, is limited.
The level of RCT support in orthopaedics is lower compared to other medical fields.
Further high-quality research is needed to guide orthopaedic surgical decision-making.