Objective — To assess the relationship of hip and knee osteoarthritis (OA) to walking difficulty.
Methods — A population cohort aged ≥55 years recruited from 1996-98 (n=28,451) completed a standardized questionnaire assessing demographics, health conditions, joint complaints and functional limitations, including difficulty walking in the past 3 months. Survey data were linked to health administrative databases; self-report and administrative data were used to identify health conditions. Hip/knee OA was defined as self-reported swelling, pain, or stiffness in a hip or knee lasting ≥6 weeks in the past 3 months without an inflammatory arthritis diagnosis. Using multivariable logistic regression, we examined the determinants of walking difficulty and constructed a clinical nomogram.
Results — 18,490 cohort participants were eligible (mean age 68 years, 60% female). 25% reported difficulty walking. Difficulty walking was significantly and independently associated with older age, female sex, body mass index, and several health conditions; of the conditions examined, the likelihood of walking difficulty was greatest with hip and knee OA and increased with number of hips/knees joints affected. The predicted probability of difficulty walking for a 60-year-old middle-income, normal-weight woman was 5-10% with no health conditions, 10-20% with diabetes and CV disease, 40% with OA in two hips/knees, 60-70% with diabetes, CV disease and OA in two hips/knees, and 80% with diabetes, CV disease and OA in all hips/knees.
Conclusion — In a population cohort, symptomatic hip/knee OA was the strongest contributor to walking difficulty. Given the importance of walking to engagement in physical activity for chronic disease management, greater attention to OA is warranted.
View full text