No difference in range of motion between ultracongruent and posterior stabilized design in total knee arthroplasty: a randomized controlled trial

Abstract

I.

Similar outcomes between ultracongruent and posterior-stabilized insert in total knee arthroplasty: A propensity score-matched analysis

“…Many studies have compared between TKAs with an UC insert and other design inserts. 9,11 –14,31,32 In terms of clinical outcomes, most of studies demonstrated similar results of UC design TKA with PS or CR, it is consistent with our study results. Multiple factors include geometry, implant size, type of insert, PCL integrity, and gap balancing are associated with AP instability in TKAs.…”

“…Interest in TKA with UC insert is increasing, some studies underwent biomechanical study about UC design, demonstrated as inferior AP stability in 90 knee flexion state than PS design due to lack of post-cam mechanism. 11,14 Otherwise, one intraoperative study that compared AP stability between UC and PS in respect of 0 , 30 , 60 , and 90 flexion state demonstrated that UC showed greater AP translation in 60 and 90 but similar in 0 and 30 ; this study suggested that implant design if UC or PS had minimal effect on mid-flexion instability. 12 This finding supports our study results that postoperative mid-flexion stability was similar between TKA with UC and PS insert.…”

“…UC design has an increased anterior buildup and a more conforming articular surface to prevent anterior displacement during knee flexion and provides an easy option to substitute the PCL without additional bone resection. 6 Many studies have compared the results between UC and the other implant types-some studies compared mobile-bearing UC and PS design, 7,8 some other studies compared fixed-bearing UC implant and cruciate-retaining design, 9,10 and other previous studies compared between fixed-bearing UC and PS design in respect of intraoperative condition [11][12][13] -the results have been controversial. Few studies compared between fixed-bearing UC and PS design in terms of range of motion (ROM), stability, and clinical outcomes; moreover, these studies are too short-term follow-up study or small volume study.…”

Sagittal radius of curvature, trochlea design and ultracongruent insert in total knee arthroplasty

“…Despite the kinematic differences, studies have found equivalent clinical outcomes between PS TKA and UC inserts. 47,49,50,55,56 Some studies have also shown that UC inserts have comparable clinical outcomes to cruciate retaining TKA. 54,57–59…”

Cruciate-Retaining vs Posterior-Stabilized Antibiotic Cement Articulating Spacers for Two-Stage Revision of Prosthetic Knee Infection: A Retrospective Cohort Study

“…Furthermore, the joint perception and isokinetic performance were similar between UC TKA and PS TKA [52,53]. However, with the use of a navigation system intraoperatively, UC TKA was found to have more sagittal laxity with less femoral rollback and knee flexion than PS TKA [53][54][55]. Unfortunately, the abovementioned studies used native osteoarthritic knees, not knees with PJI after resection.…”