Objective
To analyze electromyographic (EMG) activities of shoulder muscles in patients with a unilateral, partial-thickness tear of supraspinatus.
Methods
We evaluated a total of nine patients with a unilateral, partial-thickness supraspinatus tear. We analyzed the correlation between EMG activities of shoulder muscles, such as the upper trapezius, lower trapezius, lateral deltoid and posterior deltoid muscles, during shoulder range of motions exercise, such as flexion, abduction, scaption, shrugging, flexion with resistance, abduction with resistance, scaption with resistance and shrugging with resistance and the Shoulder Pain and Disability Index (SPADI) scores. To do this, we classified total SPADI scores into two categories based on a cut-off value of 50 points; the patients were subdivided into two subgroups: the higher SPADI score group (SPADI >50 points) and the lower SPADI score group (SPADI <50 points).
Results
The EMG amplitude of the upper trapezius was significantly higher after the abduction, scaption, abduction with resistance and scaption with resistance on the affected side as compared with the non-affected one (p<0.05). In addition, the higher SPADI score group (SPADI >50 points) had a significantly longer amplitude after shrugging, flexion with resistance, abduction with resistance, scaption with resistance and shrugging with resistance on the affected side as compared with the non-affected one (p<0.05).
Conclusion
In conclusion, our results indicate that the Korean version 49 of the SPADI is a valid, reliable
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