PURPOSE: To determine the effectiveness of low-level laser therapy (LLLT) in patients with discogenic lumbar radiculopathy and correlation among pain intensity, functional disability, and lumbar range of motion (LROM). STUDY DESIGN/SETTING: A double-blind RCT was conducted at physical therapy departments of different hospitals of Islamabad, Pakistan. The study period was March 2020 to August 2021. PATIENT SAMPLE: The study comprised 110 patients with acute LBP and unilateral discogenic lumbar radiculopathy. OUTCOME MEASURES: The outcomes of the treatment were measured on the first day and then after 18 sessions from each patient's pain intensity, functional disability, L-ROM, and straight leg raise by using visual analogue scale, Oswestry Disability Index, dual inclinometer, and straight leg raise test. METHODS: A total of 110 participants with a mean age of 38 +/- 7.4 years were randomly assigned into two groups of 55 each. The experimental group of 55 patients was treated with LLLT and conventional physical therapy. The control group of 55 patients was treated with conventional physical therapy alone. Both groups had received 18 treatment sessions. The data were analyzed through SPSS-21.0. RESULTS: The results of the Wilcoxon signed-rank test score as well as Mann-Whitney U test indicated a statistically significant difference in values (p < 0.05 in all instances) within the groups and between the groups, respectively. CONCLUSIONS: The LLLT is proved as an efficient adjunct therapy to conventional physical therapy for discogenic lumbar radiculopathy.

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