title: The stability of the cemented tibial component of total knee arthroplasty: posterior cruciate-retaining versus posterior-stabilized design.
abstract: Micromotion of the tibial component in 40 knee arthroplasties for gonarthrosis was studied using Roentgen stereophotogrammetric analysis. The stability of this component was assessed for 2 years' postoperatively. In all arthroplasties, an attempt was made to reconstruct the preoperative posterior slope. Posterior cruciate-retaining (CR) and posterior-stabilized (PS) components showed at 2 years a maximum total point motion of 0.6 +/- 0.4 mm and 0.7 +/- 0.5 mm, respectively. Whereas 92.5% of the implants were determined to be stable, 1 of the CR group and 2 of the PS group displayed migration between the first and the second year of at least 0.2 mm. A negative correlation between subsidence of the tibial component at 2 years of follow-up and the difference between preoperative and postoperative tibial slope was found. Consequently, we suggest that restoring the original posterior slope of the tibial plateau must be a goal of tibial component implantation.
authors.affiliation: Istituti Ortopedici, Rizzoli, Bologna, Italy.
authors.forename: Fabio
authors.initials: F
authors.lastname: Catani
authors.forename: Alberto
authors.initials: A
authors.lastname: Leardini
authors.forename: Andrea
authors.initials: A
authors.lastname: Ensini
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Cucca
authors.forename: Laura
authors.initials: L
authors.lastname: Bragonzoni
authors.forename: Soren
authors.initials: S
authors.lastname: Toksvig-Larsen
authors.forename: Sandro
authors.initials: S
authors.lastname: Giannini
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D002484:Cementation; D005260:Female; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D010780:Photogrammetry; D011474:Prosthesis Design; D011475:Prosthesis Failure; D016059:Range of Motion, Articular; D018709:Statistics, Nonparametric; D013977:Tibia / Q000601:surgery*; D016896:Treatment Outcome