Follow-up Study On Total Knee Arthroplasty With Nexgen-LPS-Flex Prosthesis For Osteoarthritis

Objective:To analyse and summarize the clinical results of total knee arthroplasty (TKA) on knee osteoarthritis(OA) retrospectively.Methods:182 patients (258 knees) with OA accepted primary total knee arthroplasty (TKA) with Nexgen-LPS-FLEX prosthesis between January 2005 and December 2007 from the First Affiliated Hospital of Nanjing Medical University were followed-up. The scores of knee HSS, pain and function, range of motion (ROM), post-operative x-rays of the knees, patients'satisfaction rate and the complications were evaluated. And the results of patellar retention or resurfacing were compared. The data were analyzed with SPSS 17.0 software.Results:Out of 182 patients (258 knees), 170cases (237 knees) had been followed up for an average of 52.12 months(ranged, 36~60 months) with a visted rate of 93.41%. The scores of HSS, function and pain increased respectively from 40.28 points(ranged, 16～78 points), 8.6 points(ranged, 0-19 points) and 13.6 points(ranged, 5～23 points) preoperatively to 85.3 points(ranged, 69-98 points), 17.6 points(ranged, 14-22 points) and 25.3 points(ranged, 18-30 points) (P<0.05) at the final followed-up. The excellent and good rate of knee HSS scores was 88.82%. Maximum degree of flexion increased from 98.2degrees(ranged, 10～112.5 degrees) to 130.8degrees(ranged, 105.5～138 degrees) (P<0.05), and the range of motion(ROM) were improved significantly. Patients' satisfactory rate was 81.18%. There was anterior knee pain remained in 28cases (35 knees)(16.43%) after the surgeries. Flexion deformity of greater than or equal to 5°was occurred in 10cases(13knees)(5.89%) and the deep vein thrombosis(DVT) occurred in 2 cases(2 knees)(1.18%), delayed infection in 2 cases(2 knees)(1.18%) and aseptic loosening of tibial components in 2 cases(2 knees)(1.18%). The asymptomatic, unprogressive periprosthetic lucent line was found in the X-ray film in one case. The position of the components and the alignment of the lower extremity were good.Conclusion:Total knee arthroplasty(TKA) used in the treatment of patients with knee OA has a good effect as a whole, which can significantly improve the life quality and the function of knee joint, ease the pain effectively. TKA is a good chioce for the patients' with OA knees.