Purpose: To study the functional outcome of Total Hip Replacement in primary and secondary osteoarthritis of hip. Materials and methods: The study consisted of 20 patients with diseased hips treated with total hip replacement operated in the Department of Orthopaedics, Vijayanagar Institute of Medical Sciences, Ballari from August 2020 to August 2022. Information of the patients was compiled from clinical details, case files and operation theatre records. This was a prospective study. The patient follow up was for a minimum of 6 months to maximum of 24 months (2 years). Modified Harris hip score was used for evaluation of functional outcome. Results: Functional outcome of the procedure was done by following Modified Harris hip