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Uncemented rotating-platform total knee replacement: a five to twelve-year follow-up study
R Barry Sorrells1, Paul E Voorhorst, Jeffrey A Murphy
1The Joint Replacement Clinic, 8907 Kanis Road, Suite 300, Little Rock, AR 72205, USA.
The Journal of Bone and Joint Surgery. American Volume
|October 7, 2004
Summary
This study shows that the first-generation uncemented mobile-bearing total knee replacement offers good implant survival and clinical effectiveness over 5-12 years, making it a viable alternative for patients.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Materials Science
Background:
- Mobile-bearing total knee arthroplasty (TKA) designs offer an alternative to fixed-bearing TKA.
- This study evaluates a specific bicruciate ligament-sacrificing, porous-coated, mobile-bearing TKA design.
Purpose of the Study:
- To assess the intermediate-term clinical outcomes and implant survival of a mobile-bearing TKA.
- To evaluate radiographic findings associated with this TKA design.
Main Methods:
- Prospective study of 528 uncemented primary TKAs in 421 patients (1984-1994).
- All patellae were resurfaced; patients were followed for 5-12 years.
- Clinical outcomes assessed using the New Jersey Orthopaedic Hospital knee-scoring system; radiographic analysis performed annually.
Main Results:
- Implant survival rate at 12 years was 89.5% (Kaplan-Meier estimate).
- Significant improvement in clinical scores observed in the first 12 months postoperatively, followed by plateau.
- Radiographic analysis revealed radiolucent lines in 93 knees, mostly <1 mm and non-progressive; no revisions due to radiolucencies >2 mm.
Conclusions:
- The first-generation uncemented mobile-bearing TKA demonstrated good survival and clinical efficacy.
- This design is a viable option for patients requiring total knee replacement over a 5-12 year follow-up period.