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Glenohumeral elevation studied in three dimensions.

A O Browne1, P Hoffmeyer, S Tanaka

  • 1Department of Orthopaedics, Mayo Clinic, Rochester, Minnesota 55905.

The Journal of Bone and Joint Surgery. British Volume
|September 1, 1990
PubMed
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Shoulder elevation involves specific humeral rotation. External rotation aids maximal arm elevation anterior to the scapula, while internal rotation is needed posterior to it, preventing impingement.

Area of Science:

  • Orthopedics
  • Biomechanics
  • Anatomy

Background:

  • Understanding glenohumeral joint motion is crucial for diagnosing and treating shoulder pathologies.
  • The relationship between arm elevation planes and humeral rotation requires further elucidation.

Purpose of the Study:

  • To investigate the three-dimensional position and rotational changes of the glenohumeral joint during arm elevation.
  • To determine the plane of maximal arm elevation relative to the scapula.
  • To quantify the humeral rotation associated with maximal elevation.

Main Methods:

  • Utilized a three-dimensional magnetic-field tracking system.
  • Studied nine fresh cadaveric shoulder specimens.
  • Measured position and rotational changes during simulated arm elevation.

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Main Results:

  • Maximal arm elevation occurred 23 degrees anterior to the plane of the scapula.
  • External humeral rotation (approx. 35 degrees) was necessary for maximal elevation anterior to the scapula.
  • Internal humeral rotation facilitated elevation posterior to the scapula.
  • Humeral rotation prevents the greater tuberosity from impinging on the acromion and relaxes inferior capsular constraints.

Conclusions:

  • Humeral rotation is integral to achieving maximal glenohumeral elevation.
  • The findings help explain limited elevation in conditions like adhesive capsulitis and post-surgical stiffness.
  • Quantifying obligatory humeral rotation provides insights into shoulder biomechanics and pathology.