Finally , with use of a variety of vali date d measures , there was no difference between the two groups in terms of functional status at two , eight , and ten years , regardless of the measure used .
A less expensive all-polyethylene component as part of a total knee arthroplasty has results equivalent to those obtained with a cemented metal-backed tibial component .
BACKGROUND The cost of the implant as part of a total knee arthroplasty accounts for a substantial portion of the costs for the overall procedure : all-polyethylene tibial components cost considerably less than cemented metal-backed tibial components .
We performed a systematic review of the literature to determine whether the clinical results of lower-cost all-polyethylene tibial components were comparable with the results of a more expensive metal-backed tibial component .
Rotating Platform Knees Did Not Improve Patellar Tracking: A Prospective, Randomized Study of 240 Primary Total Knee Arthroplasties
Renewed interest in mobile-bearing total knee replacement design s has been generated by the concept of self alignment and the suggestion that those design s can accommo date small mismatches in the rotational position of the tibial and femoral components . Self alignment might improve patellar tracking , decrease the prevalence of lateral retinacular release and postoperative patellar tilt or subluxation , improve knee flexion , and improve patellofemoral function during daily activities such as stair climbing . This prospect i ve r and omized study of 240 patients used a single posterior-stabilized femoral component  and included three groups of 80 patients : an  all-polyethylene group , a modular metal-backed group , and a rotating platform tibia group . The prevalence of lateral retinacular release was 3.8 % in each group . The prevalence of patellar tilt was 5 % ( all-polyethylene group ) , 7 % ( modular metal-backed group ) , and 11 % ( rotating platform group ) . Preoperative motion was not significantly different and both the 3-month flexion ( 112 ° , 110 ° , and 108 ° ) and 1-year flexion ( 116 ° , 117 ° , and 115 ° ) were not significantly different among the all-polyethylene , modular metal-backed , and rotating platform groups , respectively . Preoperative stair climbing scores were not significantly different and both the 3-month ( 38 , 41 , and 35 points ) and 1-year ( 44 , 46 , and 42 points ) scores were not significantly different . In this prospect i ve r and omized study , the rotating platform knee design did not decrease the prevalence of lateral retinacular release or patellar tilt or subluxation and did not increase knee flexion or improve stair climbing ability at 3 months or at 1 year postoperatively when compared with a posterior-stabilized , fixed-bearing knee
Finally , with use of a variety of vali date d measures , there was no difference between the two groups in terms of functional status at two , eight , and ten years , regardless of the measure used .
A less expensive all-polyethylene component as part of a total knee arthroplasty has results equivalent to those obtained with a cemented metal-backed tibial component .
BACKGROUND The cost of the implant as part of a total knee arthroplasty accounts for a substantial portion of the costs for the overall procedure : all-polyethylene tibial components cost considerably less than cemented metal-backed tibial components .
We performed a systematic review of the literature to determine whether the clinical results of lower-cost all-polyethylene tibial components were comparable with the results of a more expensive metal-backed tibial component .