Beyond Euler/Cardan analysis: True glenohumeral axial rotation during arm elevation and rotation.

ABSTRACT:

Background

Based on Euler/Cardan analysis, prior investigations have reported up to 80° of glenohumeral (GH) external rotation during arm elevation, dependent on the plane of elevation (PoE). However, the subtraction of Euler/Cardan angles does not compute the rotation around the humerus' longitudinal axis (i.e. axial rotation). Clinicians want to understand the true rotation around the humerus' longitudinal axis and rely on laboratories to inform their understanding of underlying shoulder biomechanics, especially for the GH joint since its motion cannot be visually ascertained. True GH axial rotation has not been previously measured in vivo, and its difference from Euler/Cardan (apparent) axial rotation is unknown.

Research question

What is the true GH axial rotation during

SUBMITTER: Aliaj K 

PROVIDER: S-EPMC8316370 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature