Background: Total hip arthroplasty is one of the most commonly done reconstructive procedures in orthopaedics providing pain relief and improved function to patients with end-stage degenerative joint disease.This study aims to find the effect of acetabular reaming on the medialisation and appropriate reconstruction of the hip centre of rotation and compare it with the functional outcome in 40 cases studied prospectively. Materials & Methods: A prospective study was done on 40 patients admitted under Orthopaedics for THR. Functional outcome of the patients was assessed using HHS preoperatively and at follow up visits during 6,12,18, 24 weeks. Results: Among 31 (77.5%) participants who were found to have a medial centre of rotation, 4 (12.9%) participants had good functional outcome at 24 weeks and 27(87.1%) participants had excellent functional out come. Only 9(22.5%)participants had a lateral position of the centre of rotation and all of them were found to have excellent functional outcome. Results of Chi square test showed that there was no statistically significant association between COR and functional outcome. (χ2=1.290, pvalue=0.256). Conclusion: Medial COR was foundin77.5%ofpatientsandlateral in22.5%.Excellent functional outcome was found in 87.1% patients with medial COR. There is not enough evidence to suggest an association between COR and functional outcomeat24 weeks from the present study.