Aim: The purpose of this study was to reveal mid-term outcomes by retrospectively investigating patients who underwent total knee arthroplasty with a posterior stabilized design. Material and methods: The study included a total of 68 knees of 52 patients with completed follow-up data who underwent PCL substituting (PS) total knee arthroplasty due to a diagnosis of primary or secondary osteoarthritis. The 52 patients comprised 45 (86.5%) females and 7 (13.5%) males with a mean age of 65.2±9.32 years (range, 30-82 years). The American Knee Society criteria were adopted for assessment of patient knee scores and functional knee scores. The Total Knee Prosthesis Radiological Evaluation criteria were applied for radiological evaluation of the patients. Results: The mean follow-up period of the patients was 32.1 ± 9.85 months (range: 18-60 months) and the Knee Society Scores (KSS) were 41.5 (range: 26 - 58) preoperatively, and 84.3 (range: 51 - 97) postoperatively. The mean preoperative and postoperative range of motion was 88.2º (range: 60º - 100º), and 106.7º (range: 90º - 120º), respectively. Two-stage revision surgery was applied to one patient due to deep infection. No cases of aseptic loosening were observed. Implant survivorship, and excellent and good results according to the functional knee score were reported as 98.8%, 41.1%, and 32.3%, respectively. Conclusion: Positive patient outcomes were obtained with the use of PS total knee arthroplasty in patients with severe osteoarthritis and there was no evidence of loss in mid-term follow-up.