Abstract：
BACKGROUND:Long-term results of the 'classic' low contact stress (LCS) total knee replacement (TKR) have been satisfactory; nonetheless, design changes have been made which resulted in the 'complete' LCS TKR. The aim of this study is to compare the 5-year incidence of revision and midterm clinical performance before and after introduction of the 'complete'. METHODS:A retrospective cohort analysis was conducted on 100 primary uncemented TKRs of both designs. At 5-year follow-up, revision and reoperation rates were determined for these 200 TKRs. Knee Society score (KSS), the Oxford Knee score (OKS) and range of motion were determined for 143 TKRs. RESULTS:In the 'classic' cohort, 3% of the TKRs were revised compared with 5% in the 'complete' cohort (p = 0.72).The mean KSS was 134.1 (SD 38.3) in the 'classic' cohort compared to 135.0 (SD 42.8) in the 'complete' cohort (p = 0.89). Of the 'complete' TKRs, 35.2% scored within the lowest quartile of the KSS knee compared to 16.7% of the 'classic' TKRs (p = 0.01). The OKS was 23.3 (SD 9.3) in the 'classic' cohort compared to 22.5 (SD 10.1) in the 'complete' cohort (p = 0.45). More than 5° flexion contracture was only found in four patients in the 'complete' cohort (p = 0.04). CONCLUSIONS:No statistical difference in revision rate and average scores for midterm clinical performance was observed between the 'classic' and the 'complete'. However, the 'complete' cohort had a higher percentage of KSS Knee in the lowest quartile, which suggests a clinical relevant difference compared with the 'classic'. Further investigation in future studies with new designs is needed.
journal_name
J Orthop Surg Resjournal_title
Journal of orthopaedic surgery and researchauthors
Piepers MJ,van Hove RP,van den Bekerom MP,Nolte PAdoi
10.1186/1749-799X-9-7subject
Has Abstractpub_date
2014-02-06 00:00:00pages
7issn
1749-799Xpii
1749-799X-9-7journal_volume
9pub_type
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