PT  - JOURNAL ARTICLE
AU  - KHALID ALZAHRANI
AU  - RAJIV GANDHI
AU  - JUSTIN deBEER
AU  - DANIELLE PETRUCCELLI
AU  - NIZAR MAHOMED
TI  - Prevalence of Clinically Significant Improvement Following Total Knee Replacement
AID  - 10.3899/jrheum.100233
DP  - 2011 Apr 01
TA  - The Journal of Rheumatology
PG  - 753--759
VI  - 38
IP  - 4
4099  - http://www.jrheum.org/content/38/4/753.short
4100  - http://www.jrheum.org/content/38/4/753.full
SO  - J Rheumatol2011 Apr 01; 38
AB  - Objective. Although total knee replacement (TKR) has a high reported success rate, the pain relief and functional improvement after surgery vary. The purpose of our retrospective cohort study was to determine the prevalence of patients showing no clinically important improvement 1 year after TKR, and patient factors that may predict this outcome. Methods. We reviewed primary TKR registry data that were collected from 2 academic hospitals: the Toronto Western Hospital and the Hamilton Health Sciences Henderson Hospital in Ontario, Canada. Relevant covariates including demographic data, body mass index, and comorbidity were recorded. Knee joint pain and functional status were assessed at baseline and at 1-year followup with the Western Ontario McMaster University Osteoarthritis Index (WOMAC) and Oxford Knee Score (OKS) to measure the change using the minimal clinically important difference (MCID). Logistic regression modeling was used to identify the predictors of interest. Results. Overall, 11.7% (373/3177) of patients reported no clinically important improvement 1 year after surgery. Logistic regression modeling showed that a greater patient age independently predicted no clinically important improvement on the WOMAC scale 1 year after surgery (p = 0.0003), while being male independently predicted no clinically important improvement on the OKS 1 year after surgery (p = 0.008). Conclusion. Awareness of the prevalence of patients who may show no clinically important improvement and factors that predict this outcome will help patients and surgeons set realistic expectations of surgery.