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The Lumbar Spine Instability Questionnaire (LSIQ) is a patient-reported outcome measure (PROM) suggested to measure clinical instability of the spine. The aim was to translate and cross-culturally adapt the LSIQ into Swedish and to test its measurement properties. We included people with low back pain (LBP) seeking primary care (n = 101). The LSIQ was translated using international recommendations. Construct validity was investigated via the Roland Morris Disability Questionnaire (RM) and the Numeric Pain Rating Scale (NPRS). Reliability was tested via test-retest (Intra Class Correlation, ICC 2.1 ) (n = 50) and by analyzing internal consistency (Cronbach Alpha). A suggested cutoff score was used to study discriminative ability. The LSIQ was successfully translated into Swedish. For construct validity, a moderate correlation was shown with the RM (rho 0.58) and the NPRS (rho 0.47). Test-retest demonstrated high reliability for the total score (ICC 2.1  0.94, 95% CI 0.86–0.96). Internal consistency reached a Cronbach Alpha of 0.64. Participants scoring higher on the LSIQ (≥9) showed significantly higher pain and lower disability levels, were of higher age and less physically active. The Swedish LSIQ shows acceptable measurement properties regarding test-retest reliability and validity. To further study the usefulness of the LSIQ and the suggested cutoff score, the dimensionality needs to be investigated.

The Swedish version of the Lumbar Spine Instability Questionnaire: A clinimetric study of validity and reliability