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The reliability and validity of the composite orthopaedic rating scale as a measurement of clinical severity in the investigation of mechanical low back pain

The aim of this investigation was to develop inter-examiner reliability as well as construct and concurrent validity of the Composite Orthopedic Ratin g Scale (CO RS) so that it may be used as an applicable measurement instrument for use in clinical trials relating to mechanical low back pain. This prospective, single - blinded construct and concurrent validity and inter-examiner reliability study consisted of 122 participants, all suffering from mechanical low back pain, specifically lumbar facet or sacro-iliac syndrome. The participants were only required for 1 visit where they were assessed and diagnosed using standardized diagnostic criteria. Thereafter, both the researcher and a blinded, independent examiner applied the tests contained in the Composite orthopedic Rating ScaLe (CO RS) to the participants. Subjective data was obtained using the Roland-Morris Disability Questionnaire and the Numerical Pain Rating Scale- 101. Objective data was obtained from the results of the appIication of the provocative Orthopedic test in the CORS