title: Radiostereometric measurement of polyethylene deformation pattern in meniscal bearing TKR at 5 years follow-up.
abstract: To determine polyethylene deformation in well-functioning meniscal bearing PCL-retaining total knee prosthesis a quantitative stereophotogrammetric analysis was carried out over 5 years' follow-up. Polyethylene plastic deformation was obtained by tracking the intermarker distance variations of five tantalum beads inserted into the polyethylene prior to surgery in a known position. Plastic deformation occurred in the posteromedial part of the meniscal bearing. Radiostereometric analysis was a useful tool to monitor the load distribution in vivo on the polyethylene of this meniscal bearing prosthesis. This analysis revealed a very similar pattern of plastic deformation in the polyethylene insert of this prosthesis design to the wear pattern revealed with different methodologies in PCL-retaining fixed-bearing prosthesis.
authors.affiliation: Biomechanics Laboratory, Istituti Ortopedici Rizzoli, Via di Barbiano 1/10, 40136, Bologna, Italy. a.russo@biomec.ior.it
authors.forename: Alessandro
authors.initials: A
authors.lastname: Russo
authors.forename: Laura
authors.initials: L
authors.lastname: Bragonzoni
authors.forename: Claudia
authors.initials: C
authors.lastname: Trozzi
authors.forename: Francesco
authors.initials: F
authors.lastname: Iacono
authors.forename: Andrea
authors.initials: A
authors.lastname: Visani
authors.forename: Maurilio
authors.initials: M
authors.lastname: Marcacci
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects*; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008422:Materials Testing; D010780:Photogrammetry; D020959:Polyethylene; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013635:Tantalum
chemical_list: D013635:Tantalum; D020959:Polyethylene