BACKGROUND: We modified the Charnley Classification for hips to facilitate its use with knee arthroplasty patients and investigated what affect the different classes of co-morbidity had on the results of a spectrum of outcome questionnaires. PATIENTS AND METHODS: 3600 patients from the Swedish Knee Arthroplasty Registry were surveyed by post with a variety of questionnaires ranging from multiple-item general health, to a single-item knee arthroplasty specific questionnaire. All patients also completed a co-morbidity questionnaire, from which a modified Charnley Classification was generated for each patient. We then investigated the correlation and relationship between the results of the questionnaires and the different classes of co-morbidity. RESULTS: The results of the questionnaires tested varied significantly by Charnley Class, regardless of the specificity of the questionnaire used. INTERPRETATION: We suggest that co-morbidity should be taken into account in outcome studies utilizing general health or disease/site specific questionnaires.
BACKGROUND: We modified the Charnley Classification for hips to facilitate its use with knee arthroplasty patients and investigated what affect the different classes of co-morbidity had on the results of a spectrum of outcome questionnaires. PATIENTS AND METHODS: 3600 patients from the Swedish Knee Arthroplasty Registry were surveyed by post with a variety of questionnaires ranging from multiple-item general health, to a single-item knee arthroplasty specific questionnaire. All patients also completed a co-morbidity questionnaire, from which a modified Charnley Classification was generated for each patient. We then investigated the correlation and relationship between the results of the questionnaires and the different classes of co-morbidity. RESULTS: The results of the questionnaires tested varied significantly by Charnley Class, regardless of the specificity of the questionnaire used. INTERPRETATION: We suggest that co-morbidity should be taken into account in outcome studies utilizing general health or disease/site specific questionnaires.
Authors: Paul E Stang; Nancy A Brandenburg; Michael C Lane; Kathleen R Merikangas; Michael R Von Korff; Ronald C Kessler Journal: Psychosom Med Date: 2006 Jan-Feb Impact factor: 4.312
Authors: Vivek Singh; Stephen Zak; Joseph X Robin; David N Kugelman; Matthew S Hepinstall; William J Long; Ran Schwarzkopf Journal: Eur J Orthop Surg Traumatol Date: 2021-05-26
Authors: J Christiaan Keurentjes; David Blane; Melanie Bartley; Johan J B Keurentjes; Marta Fiocco; Rob G Nelissen Journal: PLoS One Date: 2013-03-08 Impact factor: 3.240
Authors: J Christiaan Keurentjes; Marta Fiocco; Cynthia So-Osman; Ron Onstenk; Ankie W M M Koopman-Van Gemert; Ruud G Pöll; Herman M Kroon; Thea P M Vliet Vlieland; Rob G Nelissen Journal: PLoS One Date: 2013-04-03 Impact factor: 3.240