title: The effect of a stem on the tibial component of knee arthroplasty. A roentgen stereophotogrammetric study of uncemented tibial components in the Freeman-Samuelson knee arthroplasty.
abstract: We studied the effect of a metal tray with an intramedullary stem on the micromotion of the tibial component in total knee arthroplasty. Of 32 uncemented Freeman-Samuelson knee arthroplasties performed in London and Gothenburg, nine had a metal backing and stem added to the tibial component. Micromotion of the tibial components, expressed as migration and inducible displacement, was analysed using roentgen stereophotogrammetric analysis up to two years follow-up. The addition of a metal back and a 110 mm stem to the standard polyethylene component significantly reduced both migration over two years and inducible displacement.
authors.affiliation: Department of Orthopedics, Ostra Hospital, Gothenburg, Sweden.
authors.forename: B E
authors.initials: BE
authors.lastname: Albrektsson
authors.forename: L
authors.initials: L
authors.lastname: Ryd
authors.forename: L V
authors.initials: LV
authors.lastname: Carlsson
authors.forename: M A
authors.initials: MA
authors.lastname: Freeman
authors.forename: P
authors.initials: P
authors.lastname: Herberts
authors.forename: L
authors.initials: L
authors.lastname: Regnér
authors.forename: G
authors.initials: G
authors.lastname: Selvik
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D001696:Biomechanical Phenomena; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D009068:Movement; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery; D010780:Photogrammetry; D011446:Prospective Studies; D011475:Prosthesis Failure; D011859:Radiography; D013977:Tibia / Q000000981:diagnostic imaging / Q000503:physiopathology