Influence of Changes in Patella Indices on Total Knee Replacement Surgery Outcomes.

Summary: Total knee replacement is increasingly widely prescribed, not only for degenerative joint disease but also for other problems such as articular cartilage disease, misalignment due to causes other than degeneration, bone and joint cancer, and diseases that cause joint destruction. However, changes in knee joint biomechanics as well as complications of the patellofemoral joint after surgery lead to instability, joint pain, patellar rupture, and patellar tendon rupture. These are issues that challenge surgeons as well as make patients hesitant when considering knee replacement surgery. Understanding the changes in patella index that can occur after total knee replacement surgery will help surgeons carefully evaluate patients before surgery and calculate intraoperative techniques to minimize complications. Methods: Fifty-eight patients with 62 knees were diagnosed with osteoarthritis and underwent total knee replacement surgery. All patients had clinical and radiographic evaluation of the knee joint before and after surgery. Results: Patellar indexes did not change significantly after surgery compared to before surgery. Before surgery, 2 patients (3.23%) had true patella baja. After surgery, 7 patients (11.29%) had true patella baja and 3 patients (4.84%) had pseudo-patella baja. The average knee flexion amplitude after surgery was 103.11±15.440, with only 2 patients losing extension >50º. The average KS score after surgery was 83.69±9.98, significantly improved compared to before surgery 33.44±11.38. Similarly, KFS score after surgery was 81.01±8.84 compared to before surgery 37.05±8.08. Conclusion: Changes in index of the patella before and after surgery affect the surgical results, the normal patella group has better results than the group with patella baja.

A cadaveric study on the anatomy of anterior cruciate ligament in Vietnamese adults.

OBJECTIVES: To report the anatomical characteristics of the ACL in Vietnamese individuals. SUBJECTS AND METHODS: Ten fresh knees were dissected to investigate the anatomical characteristics of ACL. The insertion position, length and diameter of ACL were measured. RESULTS: The average lengths of AM and PL bundle of the ACL were 30.6 mm and 25.6 mm, respectively. The average sizes of the femoral and tibial ACL attachment sites were 13.8 × 10.6 mm and 13.4 × 10.2 mm, respectively. CONCLUSION: The anatomical characterisitcs of the ACL in Vietnamese individuals were reported.