Abstract
A total of 1,401 primary total knee arthroplasties (TKA) were reviewed; 44 (3.2%) had at least the patellar component revised. Nine of these knees (eight patients) had insufficient bone stock to allow reimplantation of another patellar component. Clinical data on the nine knees were obtained with recent follow-up evaluation, review of their medical records and radiographs. Evaluation included Hospital for Special Surgery (HSS) scores. Average follow-up was 4 years and 7 months, 2-year range (2 months to 8 years and 4 months). Common factors found in these nine knees included: thin patella after primary TKR status, osteoarthritis, good range of motion and patella alta. Results were good to excellent in seven knees and fair in two. The untoward associations with patellectomy such as quadriceps lag, extension weakness and anterior knee pain were not experienced. Resection of the patellar component, without reimplantation, is an acceptable alternative in revision TKA lacking adequate remaining bone stock.
Résumé
Objectif: Analyser les reprises des prothèses totales de genou avec ablation de l’insert rotulien. 1401 prothèses totales du genou ont été revues. 44 genoux (3,2%) ont eu une révision du composant rotulien. 9 de ces genoux (8 patients) n’avaient pas un stock osseux suffisant pour permettre une réimplantation d’une prothèse rotulienne. Méthodes: les données cliniques de ces 9 patients ont été analysées ainsi que leur suivi clinique et radiographique et une évaluation selon le score HSS. Résultats: le suivi moyen a été de 4 ans et 7 mois (de 2 mois à 8 ans, 4 mois). Ces malades présentaient en commun une épaisseur patellaire très mince après la prothèse primaire avec une bonne mobilité et une rotule haute. Les résultats ont été excellents et bons dans 7 cas et médiocres dans 2 cas. Nous n’avons pas évalué la force du quadriceps et les douleurs antérieures. En conclusion: l’ablation du composant patellaire sans réimplantation est une alternative acceptable dans les révisions de prothèses totales du genoux qui n’ont pas un stock osseux suffisant.
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We would like to acknowledge the financial support of Mercy Hospital and Arthritis Surgery and Research Foundation.
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Lavernia, C.J., Alcerro, J.C., Drakeford, M.K. et al. Resection arthroplasty for failed patellar components. International Orthopaedics (SICOT) 33, 1591–1596 (2009). https://doi.org/10.1007/s00264-008-0674-0
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DOI: https://doi.org/10.1007/s00264-008-0674-0