INTRODUCTION: Neck pain is a significant cause of disability worldwide, caused by various conditions like underlying diseases, mechanical and neuropathic abnormalities. Longwave Diathermy (LWD) is a therapeutic heating modality used to treat many musculoskeletal conditions. OBJECTIVE: To evaluate the efficacy of LWD on pain, disability, and range of motion (ROM) in neck pain. METHODS AND MATERIALS: The study was conducted after ethical approval from the university and registration in clinical trial registry (PTY/2022/155 & CTRI/2022/06/043033). Thirty patients with neck pain of 20-60 years were randomly allocated into two groups. The control group (n=15) performed simple home-based exercises, while in the experimental group (n=15) longwave diathermy was also given along with home exercises, 3 times/week for 2 weeks. The outcome measures like the Visual analogue scale (VAS), neck disability index (NDI), and Neck range of motion were assessed at baseline, at the end of 2 weeks (post-treatment), and after a follow-up of 2 weeks. RESULTS AND CONCLUSION: There was a significant improvement in pain, disability, and ROM post-intervention in the control group and experimental group. Additionally, there was a significant difference in pain after follow-up in both groups. The between-group comparison suggested that there was a significant difference for VAS, NDI, and neck extension ROM (p<0.05) but not for ROM in other directions. Therefore, it can be concluded that LWD is an effective therapeutic intervention for improving pain, neck disability, and neck range of motion along with neck exercises in patients with neck pain.

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