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Mobile-bearing total knee arthroplasty: a meta-analysis
Joshua T Carothers1, Raymond H Kim, Douglas A Dennis
1New Mexico Orthopaedic Associates, Albuquerque, New Mexico, USA.
The Journal of Arthroplasty
|July 17, 2010
Summary
Mobile-bearing total knee arthroplasty (TKA) shows excellent long-term outcomes. Rotating platform designs offer superior 15-year survivorship compared to meniscal bearing implants, with low complication rates overall.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Clinical Outcomes Research
Background:
- Mobile-bearing total knee arthroplasty (TKA) is a surgical option for knee joint replacement.
- Variations in mobile-bearing designs exist, necessitating comparative outcome analysis.
Purpose of the Study:
- To conduct a meta-analysis evaluating the outcomes of mobile-bearing TKA.
- To compare the performance of different mobile-bearing TKA designs.
Main Methods:
- A comprehensive database search identified 19 manuscripts for meta-analysis.
- Included studies comprised 3506 TKAs with an average follow-up of 8.6 years.
- Data were analyzed across rotating platform, meniscal bearing, and anterior-posterior glide-rotation subgroups.
Main Results:
- Fifteen-year survivorship was higher for rotating platform designs (96.4%) versus meniscal bearing implants (86.5%).
- Component loosening (0.33%) and bearing instability (<1%) were infrequent across all subgroups.
- Implants before 1995 had higher bearing complication rates (1.6%) compared to later implants (0.1%).
Conclusions:
- Mobile-bearing TKA demonstrates excellent results over two decades with low rates of loosening and instability.
- Improved surgical techniques post-1995 likely contributed to reduced bearing complications.
