SF-36 scores in degenerative lumbar spine disorders: analysis of prospective data from 451 patients

BACKGROUND When using Health-Related Quality of Life (HRQoL) in assessing outcomes of treatment, normative data for different diagnoses are needed to allow cross-comparisons of existing and future studies. We determined the SF-36 scores in patients with surgical lumbar spine problems. METHODS This is a prospective observational study of consecutive surgical patients in one institution. In addition to SF-36 questionnaire responses, local pain, radiating pain, analgesic intake and walking ability were recorded, together with several other demographic variables. 451 patients (50% women) with median age 52 (13-88) years, operated from 1998 through 2002, were included in the study. RESULTS Preoperative SF-36 scores were significantly lower than those derived from previously published material (the general population, nonspecific low back pain (LBP) patients, other samples of non-LBP patients), also with the use of norm-based scoring. Sick-leave and worker's compensation seemed to affect perceived Health-Related Quality of Life (HRQoL), but smoking habits did not. Some SF-36 domains showed a possible discriminating pattern between diagnoses. INTERPRETATION HRQoL reported by patients scheduled for lumbar spine surgery was much worse than for the normal population and for LBP patients. The normative SF-36 values provided may be used as a benchmark in future studies