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ORIGINAL ARTICLE
Year : 2010  |  Volume : 5  |  Issue : 4  |  Page : 180-184

Varus and valgus deformities in knee osteoarthritis among different ethnic groups (Indian, Portuguese and Canadians) within an urban Canadian rheumatology practice


1 Department of Medicine, Division of Rheumatology, Brampton, ON, Canada
2 Department of Diagnostic Imaging, William Osler Health System, Brampton, ON, Canada
3 Department of Life Sciences, McMaster University, Hamilton, ON, Canada
4 Department of Statistics, McMaster University, Hamilton, ON, Canada
5 Department of Medicine, University of Western Ontario, London, ON, Canada

Correspondence Address:
Janet Pope
Department of Medicine, University of Western Ontario, London, ON, Canada

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Source of Support: None, Conflict of Interest: None


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Objective: To prospectively evaluate consecutive patients with knee osteoarthritis who presented to a Canadian community rheumatology clinic and determine the prevalence of varus deformities of the knees and the incidence of forefoot overpronation in three ethnically different populations-a Canadian-born population, Indian-born population and Portuguese-born population. Use of different therapies for knee osteoarthritis in the clinic was also evaluated. Methods: Data were collected on patient age, sex, body mass index (BMI), visual analog scale (VAS) pain, ethnic background, valgus/varus deformity at the knee and overpronation of the forefoot. Kellgren-Lawrence scores were assigned to plain radiographs. Charts were subsequently reviewed to evaluate rates of intra-articular steroid injec- tion, hyaluronic injection, surgical referral and surgical referral in the first year after being seen in the clinic. Results: Eight patients who were Portuguese-born, 26 who were Indian-born and 33 who were Canadian-born were identified. Age was not significantly different. Women had more valgus changes than men (P = 0.04), and VAS pain was not significantly different between men and women. Significantly more varus deformity was noted in the Indian-born group than the Canadian-born group (P = 0.002), and more valgus deformity was noted in the Portuguese-born than Canadian-born group (P = 0.009). There was a trend to lower BMI in the Punjabi-born group and lower VAS pain in the Canadian-born group. There was no significant correlation between BMI and VAS pain, nor age and VAS pain (r = −0.192 and −0.050 respectively). There was no significant association with either BMI or age and forefoot overpronation. No ethnicity differences in treatment such as use of intra-articular steroid/hyualuronic acid use, surgical referral or surgery were observed. Conclusions: Patient populations differed significantly in terms of varus and valgus deformities at the knee.


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