Document Detail


All-polyethylene vs. metal-backed tibial component in total knee arthroplasty-a randomized RSA study comparing early fixation of horizontally and completely cemented tibial components: part 2. Completely cemented components: MB not superior to AP components.
MedLine Citation:
PMID:  16470429     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Uncertainty exists as to whether metal backing (MB) of the tibial component is better than an all-polyethylene component (AP). This is valid for both horizontally and completely cemented components. We evaluated completely cemented MB vs. AP (Part 2). PATIENTS AND METHODS: In a randomized study, 39 patients (40 knees) with knee arthrosis were operated with cemented low-conforming total knee arthroplasty (AGC, Biomet) with a tibial component of uniform thickness (8 mm), cemented both beneath the tibial tray and around the stem. 20 patients had an all-polyethylene (AP) tibial component and 20 patients had an identical but metal-backed (MB) tibial component. We used clinical examination and radiostereometric analysis (RSA) to evaluate the hypothesis that MB improves component fixation. Fixation was evaluated using RSA up to 2 years after surgery. Clinical assessment was performed preoperatively and after 2 years using the Hospital for Special Surgeons (HSS) score. RESULTS: We found no differences in micromotion, and no differences in clinical scores could be detected between the groups at any time point. INTERPRETATION: Our findings indicate that there was equal initial fixation of the AP and MB stemmed monobloc components when they were cemented beneath the tibial plateau and around the stem.
Authors:
Hans Hyldahl; Lars Regnér; Lars Carlsson; Johan Kärrholm; Lars Weidenhielm
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Publication Detail:
Type:  Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Acta orthopaedica     Volume:  76     ISSN:  1745-3674     ISO Abbreviation:  Acta Orthop     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2006-02-10     Completed Date:  2006-02-21     Revised Date:  2009-12-11    
Medline Journal Info:
Nlm Unique ID:  101231512     Medline TA:  Acta Orthop     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  778-84     Citation Subset:  IM    
Affiliation:
Department of Orthopedics, St. Göran's Hospital, SE-112 81 Stockholm, Sweden. hans.hyldahl@stgoran.se
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MeSH Terms
Descriptor/Qualifier:
Aged
Arthroplasty, Replacement, Knee* / instrumentation,  methods
Bone Cements
Cementation / methods
Female
Humans
Knee Joint / radiography
Knee Prosthesis*
Male
Metals
Middle Aged
Osteoarthritis, Knee / surgery
Polyethylenes
Prosthesis Design
Tibia*
Treatment Outcome
Chemical
Reg. No./Substance:
0/Bone Cements; 0/Metals; 0/Polyethylenes

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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