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Research identifies shoulder motions that cause subacromial impingement
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Using ultrasound speckle tracking imaging, researchers found subacromial impingement was linked with higher vertical displacement and peak strain of the coracoacromial ligament during forward flexion, horizontal abduction and internal rotation with the arm at 90° abduction.
“It is recommended that patients with impingement syndrome or a repaired rotator cuff avoid these shoulder motions,” researchers wrote.
They enrolled eight healthy Korean men (16 shoulders) with an average age 28.6 years and analyzed their shoulder motion for in vivo vertical displacement and intraligamentous strain of the coracoacromial ligament. The researchers evaluated patients during the following action: forward flexion in the scapular plan; horizontal abduction in the axial plane; external rotation with the arm at 90°; internal rotation with the arm at 0° abduction; internal rotation at 90° abduction; and internal rotation at the back. In addition, investigators determined the interobserver and intraobserver reliabilities for all shoulders.
Results showed during shoulder flexion and horizontal abduction, mean vertical displacements were greater compared with the other shoulder motions. Forward flexion, horizontal abduction and internal rotation with arm at 90°, were not statistically different with regard to vertical displacement. Compared with other shoulder motions, forward flexion, horizontal abduction and internal rotation at 90° had higher mean peak strains.
According to researchers, the correlation coefficient for interobserver variability for vertical displacement and peak strain measurement was 0.86 and 0.77, respectively. The intraobserver reliability for vertical and peak strain measurement was 0.90 and 0.82, respectively. ‒ by Monica Jaramillo
Disclosures: The researchers report no relevant financial disclosures.
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