Midterm Results Of Primary Total Knee Arthroplasty Using GenesisⅡ Posterior-stabilized Prosthesis

Objective: The purpose of the current retrospective follow-up study was to report themidterm clinical and X-ray results of primary total knee arthroplasty using GenesisⅡposterior-stabilized (PS) prosthesis. To analysis the possible affect factors of design features ofprosthesis and sex, and to provide the basis in prosthesis selecting.Methods: One hundred and twenty-six(135knees) consecutive patients performedtotal knee arthroplasty using Genesis Ⅱ PS prosthesis between December2001and October2008.7patients(8knees)died for other reasons,10patients(13knees) were lost tofollow-up.107consecutive patients(114knees) were followed by a mean of6.4years(range,3-9years) after surgery. In seven patients, bilateral total knee arthroplastywere performed.The mean BMI was26.0±1.0.Preoperative diagnoses includedosteoarthritis in97patients(103knees), rheumatoid arthritis in3patients (4knees),traumatic arthritis in7patients (7knees). Preoperative mean KSS was47.8±6.1points,mean function scores was49.1±10.8points, mean Feller patellar score was18.6±3.6points,the mean range of motion was86.8±14.9°. All components were cemented. No patella wasresurfaced, but1knee resurfaced for postoperative malunion of patella fracture fixation.Results: No infection, dislocation, or neurovascular injury occurred, but2kneesoccurred interoperative posteriorlateral femoral condyle fractures, and anterior knee painoccurred in10knees. No components were radiographically loose. No revision surgerieswere performed. At the half year past surgery, the KSS averaged85.5±9.6points, themean function scores was80.7±12.7points, the mean Feller patellar score was26.4±2.3points, the mean range of motion was104.7±9.6°, which were increased significantlycompared with those before surgery(P<0.05). At latest follow-up, the KSS averaged 91.6±4.9points, the mean function scores was89.0±8.1points, the mean Feller patellarscore was27.8±2.2points, the mean range of motion was114.2±7.5°, which wereincreased significantly compared with those before surgery and half year pastsurgery(P<0.05).90.2%of the knees were satisfied. The mean femoral angle was96±0.9°,the mean tibial angle was90±1.1°,the mean tibial posterior slope was85.5±0.7°, and themean femoral flexion angle was1.6±0.7°. Mean tibial coverage was95.5±2.4%in thecoronal plane and98.9±1.1%in the sagittal plane.Conclusion: Midterm results of primary total knee arthroplasty using Genesis ⅡPSprosthesis was excellent, but further observation is needed. Reasonable design makesGenesis Ⅱ PS prosthesis become an ideal choice.