Background: Knee flexion contractures are common in cases with osteoarthritis, rheumatoid arthritis and post-traumatic knee arthritis, occurred in 60% of cases undergone total knee arthroplasty (TKA). The disability of the knee to extended actively or passively to 0⁰ defined as knee flexion, and classified into three grades; grade I>15, grade II 15-30° and grade III >30. Aims: to evaluate the results of total knee replacement with posterior stabilized knee prosthesis and posterior capsular release with or without modification of the basic bone cuts for the management of flexion contracture more than 10 degrees. Materials and methods: This prospective study was conducted on 45 patients with 60 knees who underwent primary total knee replacement due to arthritic knee with fixed flexion deformities with intolerable pain interfering with daily activities.36 female and 9 males with M: F ratio 1:4. Their mean age at the time of surgery was 58.6 years old range from 42 to 72 years. Results: The average post-operative knee society score (KSS) was 87.97compared with average preoperative KSS of 25.9, and the average postoperative range of motion was 116.1º compared to the pre-operative range of 69.5degrees. We can see marked improvement in the FD from 28.6 degree to 0.63 degree. The results revealed a high statistical significant improvement of FD post-operative. Conclusion: TKA was successful in correcting flexion deformity, although the amount of correction obtained depended on the degree of preoperative flexion deformity.