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Related Experiment Video

Updated: Jun 22, 2026

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
06:09

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

Published on: March 12, 2021

Shoulder activity level varies by diagnosis.

Robert H Brophy1, Bruce Levy, Samuel Chu

  • 1Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, MO, USA. brophyr@wudosis.wustl.edu

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|June 2, 2009
PubMed
Summary

Shoulder activity levels differ significantly based on diagnosis, with instability patients being most active. This finding highlights the importance of assessing patient activity for predicting outcomes in shoulder disorders.

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Area of Science:

  • Orthopedics
  • Rehabilitation Science
  • Patient-Reported Outcomes

Background:

  • Patient activity level is a potential prognostic factor for outcomes in shoulder disorders.
  • Understanding differences in activity levels across diagnoses is crucial for tailored treatment and prognosis.

Purpose of the Study:

  • To test if a shoulder activity scale can differentiate activity levels based on patient diagnosis and age.
  • To investigate the relationship between shoulder disorders, patient age, and reported activity levels.

Main Methods:

  • Cross-sectional study involving 157 patients with rotator cuff disease, glenohumeral instability, or osteoarthritis.
  • Patients completed a validated shoulder activity scale and the ASES shoulder questionnaire.
  • Data on diagnosis, age, and gender were collected and analyzed using linear regression.

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Last Updated: Jun 22, 2026

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Main Results:

  • Shoulder activity levels were significantly higher in patients with glenohumeral instability compared to rotator cuff disease or osteoarthritis.
  • Patients with rotator cuff disease reported higher activity levels than those with osteoarthritis.
  • Both diagnosis and age were significant independent predictors of shoulder activity level.

Conclusions:

  • This study is the first to demonstrate diagnosis-specific differences in shoulder activity levels.
  • Shoulder activity level should be considered a prognostic variable for predicting outcomes in shoulder disorders.
  • Assessing shoulder activity can aid in guiding treatment decisions for patients with various shoulder conditions.