Abstract: Background: Minimally invasive approaches are a more recent development, which aims at reducing damage to soft tissues. The subvastus or Southern approach to the knee had been described as early as 1929. This approach for primary total knee arthroplasty (TKA) preserves the integrity of the extensor mechanism and maintains the vascular supply to the patella. It provides excellent exposure of the knee joint with preservation of all peri-articular soft tissues. The benefits of the subvastus approach make it a valuable technique for primary TKA. This combination of advantages ensures rapid recovery, better knee range of motion and finally excellent patient satisfaction. Aim of the study: The goal of this study is to compare the subvastus method to the usual medial parapatellar technique for total knee replacement in patients with osteoarthritis based on quadriceps function recovery in days after surgery. Methods: We retrospectively reviewed case notes of 36 patients with osteoarthritis who had total knee replacements in satkhira medical college hospital and private clinics over the course of a period from August 2019 to August 2024.we evaluated all the cases regarding early postsurgical clinical outcomes (range of motion [ROM], pain on a visual analog scale, and Knee Society Score [KSS]). Preoperative quadriceps strength, BMI, and baseline demographics were all recorded from their initial pre-operative workup case notes. Starting on the first postoperative day, patients recorded first unassisted straight leg raise (SLR) was kept as the main determinant for muscle function. The data were evaluated to determine the quadriceps muscle function post TKR. Result: When compared to the medial parapatellar approach, the quadriceps muscle function returns sooner with the subvastus technique. Patients in their sixties showed the highest improvement. Preoperative quadriceps strength has a major impact on muscle recovery after surgery. Conclusion: The subvastus method to total knee replacement is linked to a faster recovery of quadriceps muscle strength, resulting in a shorter hospital stay and postoperative therapy.