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J Knee Surg 2007; 20(1): 20-26
DOI: 10.1055/s-0030-1248015
Original Article

© 2007 Thieme Medical Publishers

Influence of Joint Area Design on Tibial Component Migration – Comparison Among a Fixed Symmetrical, Asymmetrical, and Moveable Bearing

Johan Uvehammer1, 2 , J. Kärrholm1 , L. Carlsson1
  • 1The Department of Orthopedics, Göteborg University, Sahlgrenska University Hospital, Göteborg, Sweden
  • 2The Department of Orthopedics, Lidköping Hospital, Lidköping, Sweden
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Publication History

Publication Date:
20 January 2010 (online)

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ABSTRACT

Fifty-four knees (50 patients) were allocated to three different tibial polyethylene inserts (standard/rotating platform/FS1000) in the Freeman-Samuelson (Finsbury Orthopaedics Ltd, Surrey, United Kingdom) total knee arthroplasty. The FS1000 design has a spherical medial and a roller-in-trough configuration laterally. Radiostereometric examinations were done postoperatively and after 3, 12, and 24 months. The median migration of the metal-backing and the Hospital for Special Surgery scores did not differ between the three groups. At 2 years, the median external/internal displacements for the rotating platforms were 2.8° and 0.2°, respectively (rotating platforms versus standard inserts/rotating platforms versus FS1000: P < .0005). Longitudinal rotations above the detection limits for radiostereometry were observed in some of the fixed implants (standard and FS1000 designs), indicating conditions for backside wear.