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    
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.
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    
Department of Orthopedics, St. Göran's Hospital, SE-112 81 Stockholm, Sweden.
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MeSH Terms
Arthroplasty, Replacement, Knee* / instrumentation,  methods
Bone Cements
Cementation / methods
Knee Joint / radiography
Knee Prosthesis*
Middle Aged
Osteoarthritis, Knee / surgery
Prosthesis Design
Treatment Outcome
Reg. No./Substance:
0/Bone Cements; 0/Metals; 0/Polyethylenes

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