Interrater reliability of assessment of scapular dyskinesis during non-weighted and weighted arm elevationin persons with chronic idiopathicneck pain
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Abstract
Background: Altered scapular motion has been demonstrated in individuals with chronic idiopathic neck pain. However, reliability of scapular motion assessment has not been studied in this population.
Objective: To investigate interrater reliability of scapular dyskinesis by observation during non-weighted and weighted arm elevation in persons with chronic idiopathic neck pain.
Methods: Fifty participants with chronic idiopathic neck pain were recruited into the study. Scapular dyskinesis was tested by two independent assessors on the ipsilateral side of the most painful neck pain during arm elevation with and without weight. Two criteria “Yes/No” and “abnormal movement patterns” were used to categorize scapular dyskinesis. Percent agreement, Cohen’s kappa (k), prevalence adjusted bias adjusted kappa (PABAK), Prevalence Index (PI) and Bias Index (BI) were used to analyze interrater reliability.
Results: Using “Yes/No” criterion, the interrater reliability was substantial when testing without weight (percent agreement = 88%, k = 0.69, PABAK = 0.76), and almost perfect when testing with weight (percent agreement = 96%, k = 0.86, PABAK = 0.92). Using “abnormal movement patterns” criterion, the interrater reliability was moderate to substantial when testing without weight (percent agreement = 72%, k = 0.54, PABAK = 0.62) and substantial when testing with weight (percent agreement = 88%, k = 0.68, PABAK = 0.73). There were some effects of prevalence on k values (PI ranged from 0.48-0.64). No effect of bias was found (BI ranged from 0.00-0.08).
Conclusion: The visual-based scapular dyskinesis test is a reliable method to assess scapular dyskinesis in chronic idiopathic neck pain patients.
Keywords: Neck pain, Scapular dyskinesis, assessment, Interrater reliability
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