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Related Concept Videos

Wilcoxon Signed-Ranks Test for Matched Pairs01:09

Wilcoxon Signed-Ranks Test for Matched Pairs

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The Wilcoxon signed-rank test for matched pairs evaluates the null hypothesis by combining the ranks of differences with their signs. It essentially tests whether the median of the differences in a population of matched pairs is zero. Since the test incorporates more information than the sign test, it generally yields more trustable conclusions. This test also does not require the data to follow a normal distribution, but two conditions must be met for it to be applicable: (1) the data must...
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Odds Ratio01:09

Odds Ratio

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The odds ratio (OR) is a statistical measure used extensively in epidemiology and research to quantify the strength of association between exposure and outcome across different groups. Unlike relative risk, which compares the probabilities of an event occurring, the odds ratio compares the odds of an event occurring in the exposed group to the odds of it occurring in the unexposed group. The odds, in this context, are calculated as the probability of the event happening divided by the...
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Sign Test for Matched Pairs01:17

Sign Test for Matched Pairs

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The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values.
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Machines: Problem Solving I01:22

Machines: Problem Solving I

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A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
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Related Experiment Video

Updated: Oct 19, 2025

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact
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Triple-Endobutton and clavicular hook: A propensity score matching analysis.

Sujie Zhang1, Haojie Zhang2, Jiabo Wang2

  • 1Department of Orthopedics, Dongzhimen Hospital Beijing University of Chinese Medicine, No. 116, Cuiping West Road, Tongzhou District, Beijing 101100, China.

Open Medicine (Warsaw, Poland)
|September 23, 2021
PubMed
Summary

The Triple-Endobutton plate technique for acute acromioclavicular dislocation offers better clinical efficacy than the clavicular hook plate. This method provides superior pain relief and shoulder function, leading to improved patient outcomes.

Keywords:
Triple-Endobutton platesacute acromioclavicular joint dislocationclavicular hook plateminimally invasive double-incisionpropensity score matching

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Area of Science:

  • Orthopedic Surgery
  • Sports Medicine
  • Trauma Surgery

Background:

  • Acute acromioclavicular (AC) dislocation is a common shoulder injury.
  • Surgical interventions aim to restore stability and function.
  • Various fixation methods exist, including clavicular hook plates and Endobutton techniques.

Purpose of the Study:

  • To compare the clinical efficacy of the clavicular hook plate versus the Triple-Endobutton plate with a double-incision technique for acute AC dislocation.
  • To evaluate patient outcomes based on pain, shoulder function, and hospitalization duration.

Main Methods:

  • Retrospective analysis of 635 patients with acute AC dislocation undergoing surgery.
  • Propensity score matching (1:1) to compare 292 patients (146 per group).
  • Group A: Clavicular hook plate; Group B: Triple-Endobutton plates via double-incision.

Main Results:

  • Group B (Triple-Endobutton) showed significantly shorter incision length and hospitalization.
  • Group B demonstrated lower Visual Analog Scale (VAS) pain scores and higher University of California, Los Angeles (UCLA) shoulder scores.
  • Group B achieved superior Constant-Murley Score (CMS) outcomes both pre- and post-removal.

Conclusions:

  • The double-incision Triple-Endobutton plate technique is more effective than the clavicular hook plate for acute AC dislocation.
  • This technique achieves anatomical reduction and superior functional recovery.
  • Triple-Endobutton fixation offers advantages in reduced invasiveness and improved patient-reported outcomes.