Abstract
Introduction: Success in knee joint replacement surgery depends on various factors, one of which is the correct technique and avoidance of technical errors. This, in turn, requires the use of precise orthopedic instruments and tools. Over time, orthopedic tools may experience wear and corrosion, negatively impacting the clinical outcomes of joint replacement. In this study, we compare the clinical results of two groups of patients operated on with new and used sets, and we examine the effect of wear in this group of patients.
Materials & Methods: Two groups of patients who underwent knee arthroplasty using new and used sets from the same company were compared in terms of range of motion and Oxford scoring. The new and used instrument sets were also compared visually to identify differences in the shape of the instruments.
Results & Discussion: The average extension in the worn group was 7 degrees, while in the new set group, it was 2 degrees. The flexion in the worn set group was 115 degrees, and in the new set group, it was 120 degrees. Statistical calculations showed a significant difference between the two groups in both parameters, with a p-value > 0.05. Regarding the VAS pain scoring, patients in the new set group reported a pain score of 2.5, while the worn set group reported a score of 3. In the examination of the instrument, the diameter of the jig cutting guides for the distal femur was 4 millimeters and for the tibia was 3 millimeters. This measurement in the new set was 2 millimeters.
Conclusion: Bone cutting jigs can undergo mechanical wear and lose their initial accuracy. This loss of accuracy negatively impacts clinical outcomes.