Abstract
Objective To compare the clinical outcomes of Medial-pivot and Posterior-stablized total knee arthroplasty during 8 years follow-up. Methods 109 patients with osteoarthritis who underwent primary total knee arthroplasty were conducted and divided into two groups according to the choice of prosthesis,49 in the Medial-pivot(MP) group and 60 in the Postirior-stabilized(PS) group.There were no statistical differences in age,gender,BMI,operative side and operation time between the two groups (P>0.05).The same protocol of perioperative treatment was adopted in both groups. Comparison of clinical outcome and survival rates were acquired through minimum 8 years follow-up. Results The prosthesis survival rate andthe excellent and good rate of MP group were 93.9% and 88.9% during average 8.3 years follow-up period,versus the prosthesis survival rate and the excellent or good rate of PS group were 93.3% and 86.7% during average 8.4 years follow-up period.There were no statistical diferences in survival rate,excellent and good rate and radiolucency of weight-bearing areas between the two groups ( P >0.05). There were no statistical differences in range of motion,KSS score and WOMAC index between the two groups preoperatively (P>0.05).The range of motion at all follow-up time points and KSS score at 6 months postoperatively of PS group were superior than those of MP group ( P <0.05),while the WOMAC index at 8 years postoperatively and Kujala scores at 1year and 8 years postoperatively of PS group were better than those of MP group( P <0.05). Conclusion Either medial-pivot or post-stabilized total knee arthroplasty could obtain excellent or good mid-term clinical result. Although with less range of motion, the patients using MP prosthesis could obtain better results in bone loss, performance of the patellofemoral joint and mid-term satisfaction. However, the use of MP prosthesis required more professional and precise technology and it should be cautious when using for knees with severe valgus deformation.
Total knee arthroplasty with the Medial-Pivot knee system: Clinical and radiological outcomes at 9.5 years’ mean follow-up
