Background: Osteonecrosis, also known as avascular necrosis of bone, is a condition in which osteocytes and marrow components die as a result of the bone's vascularity being damaged.The present study was conducted to compare MRI and CT scan in patients with osteonecrosis of the femoral head. Materials & Methods: 70 cases of osteonecrosis of the femoral head of both genders underwent CT and MRI scans. Results: Out of 70 cases, 40 were males and 30 were females. The mean lesion volume measured from gross specimen was 20.4 cm3, CT was 22.3 cm3, and MRI was 22.5 cm3. Lesion volume measured from CT by radiologist 1 was 22.6 cm3 and from radiologist 2 was 22.9 cm3. Lesion volume measured form MRI from radiologist 1 was 22.3 cm3and from radiologist 2 was 23.4 cm.3 Conclusion: For individuals with ONFH in Association Research Circulation Osseous stage III or higher, CT and MRI can accurately depict the lesion features.