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Cemented all polyethylene tibial insert unicompartimental knee arthroplasty: a long term follow-up study
S Lustig1, J-L Paillot, E Servien
1Knee Surgery Department, centre Livet, Albert Trillat Center, North Hospitals Group, 8, rue de Margnolles, 69300 Caluire, France.
Orthopaedics & Traumatology, Surgery & Research : OTSR
|March 3, 2009
Summary
This study on all-polyethylene unicompartmental knee arthroplasties (UKAs) found excellent patient satisfaction and high survival rates. Factors like patient selection and implant design contribute to successful outcomes, comparable to total knee replacements.
Area of Science:
- Orthopedic surgery
- Biomaterials science
Background:
- Unicompartmental knee arthroplasty (UKA) outcomes can vary, influenced by implant parameters.
- Comparing UKA to total knee arthroplasty (TKA) requires understanding these influencing factors.
Purpose of the Study:
- To report outcomes of 172 all-polyethylene UKAs.
- To identify factors contributing to success and failure in UKA.
Main Methods:
- 172 cemented, all-polyethylene tibial UKAs (HLS-type) were implanted between 1988-2004.
- Mean patient age was 72.2 years; 83.7% follow-up rate with mean 62.3 months.
- Clinical data analyzed using IKS criteria; radiological evaluation pre- and post-surgery.
Main Results:
- 97.2% patient satisfaction; 81% reported no or slight pain.
- Mean flexion 133 degrees; knee score improved from 63.6 to 91.5.
- Kaplan-Meier survival rate was 95.6%; no UKAs revised for wear, with 87.2% contralateral compartment remaining normal.
Conclusions:
- All-polyethylene tibial implants with minimal bone cuts (femoral resurfacing) can achieve excellent long-term results.
- Careful patient selection and implant design are key to successful UKA outcomes.