Background: Lateral scapular slide test (LSST) quantitatively measures the distance between thoracic spine (T7) and inferior angle of scapula.
Objective: To measure intra rater reliability, inter rater reliability and diagnostic accuracy of LSST by using the caliper.
Methods: Three measurements of each test position were obtained bilaterally. ICC (2,1), 95% confidence interval and 2SEMs were calculated for intra-rater and inter-rater reliability of the absolute scapular distance. Sensitivity, specificity, positive and negative likelihood ratios were determined.
Results: Twenty-seven people with and thirty people without shoulder pain participated. The mean age and standard deviation (SD) for the participant was 47.7 years (SD= 11.6) and 33.5 years (SD= 11.7) respectively. The ICCs for intra-rater reliability were high. A range of poor to good ICCs found for inter-rater reliability. The 2SEMs ranged from 4.6 to 7.9 mm for intra-rater reliability and from 6.8 to 13.4 mm for inter-rater reliability for people with shoulder pain. Positive and negative likelihood ratios from 0.94 to 1.22 and 0.21 to 2.5 respectively were demonstrated.
Conclusion: LSST did not show a consistent high reliability. The diagnostic accuracy of the LSST was low, which questions the clinical importance of the tests outcomes.
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