title: Posterior stabilization in total knee arthroplasty with use of an ultracongruent polyethylene insert.
abstract: Fifty-three primary and 47 revision posterior cruciate ligament (PCL)-substituting total knee arthroplasties (TKAs) using a highly conforming (ultracongruent) polyethylene insert were retrospectively reviewed over a 48- to 106-month (mean, 60+/-11 months) follow-up period. These 100 knees were age and sex matched with another 100 TKAs performed using a PCL-sparing design. The ultracongruent design has an anterior buildup of 12.5 mm and a more conforming articular surface to match better the radius of the femoral component. In primary and revision TKAs, the average Hospital for Special Surgery knee score (P = .3) and range of motion (P = .43) were similar between the PCL-sparing and ultracongruent groups. In primary and revision TKAs, there were no revisions resulting from instability for patients receiving an ultracongruent insert versus 5 knees in the PCL-sparing control group secondary to subsequent postoperative anteroposterior instability and PCL insufficiency.
authors.affiliation: Department of Orthopaedics, University of Utah School of Medicine, Salt Lake City 84132, USA.
authors.forename: A A
authors.initials: AA
authors.lastname: Hofmann
authors.forename: T K
authors.initials: TK
authors.lastname: Tkach
authors.forename: C J
authors.initials: CJ
authors.lastname: Evanich
authors.forename: M P
authors.initials: MP
authors.lastname: Camargo
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D001696:Biomechanical Phenomena; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020959:Polyethylene; D016119:Posterior Cruciate Ligament / Q000601:surgery*; D011474:Prosthesis Design; D011859:Radiography; D012086:Reoperation; D012189:Retrospective Studies
chemical_list: D020959:Polyethylene