title: Sagittal laxity after posterior cruciate ligament-retaining mobile-bearing total knee arthroplasty.
abstract: Posterior cruciate ligament stretching after posterior cruciate ligament-retaining (CR) total knee arthroplasty (TKA) can lead to an increase in sagittal laxity, knee dysfunction, or accelerated damage to the tibial bearing surface. We conducted a prospective study on 74 consecutive mobile-bearing CR TKA to determine if knee laxity changed with time or if knees with large initial laxity experienced greater increases in laxity. Patients were studied with radiographic posterior and anterior drawer examinations at 3 and 23 months. Model-based shape-matching techniques were used to measure TKA kinematics. We found a 1-mm increase in posterior drawer. Knees with large postoperative drawers did not exhibit increased laxity at last follow-up. The use of a mobile-bearing CR TKA did not significantly modify the midterm knee sagittal laxity.
authors.affiliation: Université Lyon 1, F-69003, Institut National de Recherche sur les Transports et leur, Sécurité, Bron, F-69675, Laboratoire de Biomécanique et Mécanique des Chocs-UMR_T 9406, Faculté de médecine Lyon Sud, Oullins, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Chouteau
authors.forename: Jean Luc
authors.initials: JL
authors.lastname: Lerat
authors.forename: Rodolph
authors.initials: R
authors.lastname: Testa
authors.forename: Bernard
authors.initials: B
authors.lastname: Moyen
authors.forename: Scott A
authors.initials: SA
authors.lastname: Banks
authors.forename: Banks A
authors.initials: BA
authors.lastname: Scott
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee; D001696:Biomechanical Phenomena; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology* / Q000601:surgery*; D007719:Knee Joint / Q000503:physiopathology / Q000601:surgery*; D007720:Knee Prosthesis; D008875:Middle Aged; D016119:Posterior Cruciate Ligament / Q000503:physiopathology* / Q000601:surgery; D016059:Range of Motion, Articular