Abstract
Study Design : Repeated measures reliability/validity study.Objectives : To determine the concurrent validity, test-retest, inter-rater and intra-rater reliability of lumbar flexion and extension measurements using the Tracker M.E. computerized dual inclinometer (CDI) in comparison to the modified-modified Schober (MMS)Summary of Background : Numerous studies have evaluated the reliability and validity of the various methods of measuring spinal motion, but the results are inconsistent. Differences in equipment and techniques make it difficult to correlate results.Methods : Twenty subjects with back pain and twenty without back pain were selected through convenience sampling. Two examiners measured sagittal plane lumbar range of motion for each subject. Two separate tests with the CDI and one test with the MMS were conducted. Each test consisted of three trials. Instrument and examiner order was randomly assigned. Intra-class correlations (ICCs 2, 2 and 2, 2) and Pearson correlation coefficients (r) were used to calculate reliability and concurrent validity respectively.Results : Intra-trial reliability was high to very high for both the CDI (ICCs 0.85 - 0.96) and MMS (ICCs 0.84 - 0.98). However, the reliability was poor to moderate, when the CDI unit had to be repositioned either by the same rate (ICCs 0.16 - 0.59) or a different rater (ICCs 0.45 - 0.52). Inter-rater reliability for the MMS was moderate to high (ICCs 0.75 - 0.82) which bettered the moderate correlation obtained for the CDI (ICCs 0.45 - 0.52). Correlations between the CDI and MMS were poor for flexion (0.32; p<0.05) and poor to moderate (-0.42 - -0.51; p<0.05) for extension measurements.Conclusion : When using the CDI, an average of subsequent tests is required to obtain moderate reliability. The MMS was highly reliable than the CDI. The MMS and the CDI measure lumbar movement on a different metric that are not highly related to each other.
Highlights
Physical impairment evaluation is a routine and an important aspect of management in low back pain [LBP) as it helps clinicians and researchers alike to determine the progress that has resulted from an intervention
Inter-rater reliability for the modifiedmodified Schober (MMS) was moderate to high (ICCs 0.75 0.82) which bettered the moderate correlation obtained for the computerized dual inclinometer (CDI) (ICCs 0.45 - 0.52)
The MMS was highly reliable than the CDI
Summary
Physical impairment evaluation is a routine and an important aspect of management in low back pain [LBP) as it helps clinicians and researchers alike to determine the progress that has resulted from an intervention. Lumbar range of motion (ROM) measurements is an important indicator of the level of impairment in an individual with LBP [1]. Littlewood and May [6] conducted a systematic review on the validity of instruments used to measure lumbar ROM; out of the 4 studies that were included on the review 3 were on dual inclinometry and 1 was on modified-modified Schober test. They found that there was little evidence to support the current methods of measuring lumbar ROM
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