Primary total knee arthroplasty in patients receiving workers' compensation benefits
- PMID: 15887788
- PMCID: PMC3211603
Primary total knee arthroplasty in patients receiving workers' compensation benefits
Abstract
Objective: To determine the influence of Ontario Workplace Safety and Insurance Board (WSIB) benefits on short-term clinical outcomes of primary unilateral total knee arthroplasty (TKA).
Methods: In a retrospective matched-cohort study at a single tertiary-care arthroplasty centre in Ontario, we compared a study cohort of 38 successive primary TKA patients receiving WSIB benefits from 1998 to 2002 to 38 controls, a matched cohort of non-WSIB patients, comparing Oxford Knee Score and Knee Society Score (both clinical and functional components) as well as flexion and pain variables, preoperatively and at postoperative intervals of 6 weeks, 6 months and 1 year. At least 1 year after their surgery, all patients were asked to complete a non-validated patient satisfaction survey. The number of clinic visits related to the operation was also compared, by means of Ontario Hospital Insurance Plan billing codes for each individual.
Results: Preoperative measurements showed the 2 groups to be similar. At follow-up, WSIB patients had significantly higher pain scores, poorer self-perceived functional outcomes and a lower range of knee flexion than the control group. WSIB patients also required more postoperative clinic visits and were more reluctant to answer questions about functional outcome.
Conclusions: Short-term outcomes of primary TKA in patients receiving WSIB benefits are inferior to those of non-WSIB patients. WSIB patients are seen more frequently for postoperative follow-up, which we would attribute to the persistence of subjective complaints after TKA.
Objectif: Déterminer l'effet des prestations de la Commission de la sécurité professionnelle et de l'assurance contre les accidents du travail (CSPAAT) de l'Ontario sur les résultats cliniques à court terme d'une arthroplastie totale unilatérale primaire du genou (ATG).
Méthodes: Dans le contexte d'une étude rétrospective de cohorte jumelée effectuée à un seul centre d'arthroplastie de soins tertiaires de l'Ontario, nous avons comparé une cohorte de 38 patients ayant subi une ATG primaire et touchant des prestations de la CSPAAT, de 1998 à 2002, à 38 témoins, cohorte jumelée de non-patients de la CSPAAT, et comparé le score Oxford à celui que propose la Knee Society (éléments cliniques et fonctionnels), ainsi que les variables reliées à la flexion et à la douleur, avant l'intervention et à des intervalles de six semaines, six mois et un an après celle-ci. Au moins un an après avoir subi leur intervention chirurgicale, on a demandé à tous les patients de répondre à un questionnaire non validé sur la satisfaction du patient. On a aussi comparé le nombre de visites à la clinique reliées à l'intervention en utilisant les codes de facturation du régime d'assurance hospitalisation de l'Ontario pour chaque patient.
Résultats: Des mesures préopératoires ont montré que les deux groupes étaient semblables. Au suivi, les patients de la CSPAAT présentaient des scores de douleur beaucoup plus élevés, des résultats fonctionnels autoperçus moins bons et une amplitude de flexion du genou moindre que les sujets du groupe témoin. Les patients de la CSPAAT avaient aussi besoin de plus de visites postopératoires à la clinique et hésitaient davantage à répondre aux questions sur leur évolution fonctionnelle.
Conclusions: Les résultats à court terme de l'ATG primaire pratiquée chez des patients touchant des prestations de la CSPAAT sont inférieurs à ceux des autres patients. Les patients de la CSPAAT sont vus plus souvent pour le suivi postopératoire, ce que nous attribuerions à la persistance des plaintes subjectives après l'ATG.
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