Radiostereometric measurement of polyethylene deformation pattern in meniscal bearing TKR at 5 years follow-up.
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.
Russo
Alessandro
A
Biomechanics Laboratory, Istituti Ortopedici Rizzoli, Via di Barbiano 1/10, 40136, Bologna, Italy. a.russo@biomec.ior.it
Bragonzoni
Laura
L
Trozzi
Claudia
C
Iacono
Francesco
F
Visani
Andrea
A
Marcacci
Maurilio
M
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
D013635:Tantalum; D020959:Polyethylene