Title: The risk of bearing dislocation in lateral unicompartmental knee arthroplasty using a mobile biconcave design
Authors: Schelfaut, Sebastiaan ×
Beckers, Lucas
Verdonk, Peter
Bellemans, Johan
Victor, Jan #
Issue Date: Nov-2013
Publisher: Springer International
Series Title: Knee Surgery, Sports Traumatology, Arthroscopy vol:21 issue:11 pages:2487-94
Abstract: PURPOSE: A safety study was conducted on a cohort of 25 patients who underwent lateral unicompartmental arthroplasty with a biconcave mobile-bearing insert. METHODS: The first 25 lateral mobile-bearing unicompartmental knee replacements, performed in a general hospital by one surgeon, were prospectively reviewed, with a minimum follow-up of 1 year. RESULTS: One bearing dislocation occurred 4 months postsurgery. The Oxford knee score improved in all patients from a preoperative mean of 23.3 (range 8-40, SD 8.4) to a postoperative mean of 42.1 (range 23-48, SD 6.7). General patient satisfaction at a mean follow-up of 20 months was excellent in 84 %, good in 12 % and fair in 4 %. The mechanical axis as a measure on full-leg standing radiographs improved from 5.7° valgus (range 1°-16°, SD 4.1°) to 1.7° valgus (7° to -3°, SD 2.1°). Mechanical alignment correction averaged 4.0° (range -1° to 15°, SD 3.9°). CONCLUSION: The mobile biconcave insert design in the lateral unicompartmental knee replacement seems appropriate as a innovative, anatomy imitating solution, resulting in a good clinical outcome. Still, bearing dislocation remains a concern, especially in extended indication. LEVEL OF EVIDENCE: Case series, Level IV.
ISSN: 0942-2056
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Clinical Residents Medicine
Medicine Teaching Programs
Biomechanics, -implants and Tissue Engineering (-)
× corresponding author
# (joint) last author

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