OBJECTIVES Chronic lumbosacral radicular pain has significant morbidity and burden to the society. The objective of this study was to assess the functional disability and factors affecting it in patients with chronic lumbosacral radicular pain.  METHODS We performed an observational cross sectional study in a public tertiary care hospital in north India. Adult patients (18 and 75 years), with >12 weeks of low back pain, without any co-morbidities were included in this study. Data regarding socio-demographics, duration of low back pain, prescribing pattern and depression collected at baseline. Pain assessed using visual analogue scale (VAS), functional disability using modified oswesrty disability questionnaire (MODQ). Patients also asked for healthcare utilization at the end of study. Predictors of high disability were analysed using multivariate regression analysis. RESULTS A total of 246 patients (51% males and 49% females) with mean age of 44.9 (12.25) years were included for final analysis. Mean VAS and MODQ scores at baseline are 72.3+12.5 and 48.3+11.2 respectively. Based on disability scores, 62% of patients found to be crippled whereas 62% and 24% of patients fall in severe and moderate disability category respectively. VAS and MODQ scores were positively correlated (r=0.84, p<0.05). Multi factorial analysis reveals that severe pain (higher VAS scores), high duration of pain, older age, over-weight, patients from urban region and depression were significantly associated with high disability.  CONCLUSIONS Our study results suggest that chronic lumbosacral radicular pain patients suffer with sever disability. Severity of pain was significantly correlated with levels of disability.