Epidemiology and Risk Factors of Patellofemoral Osteoarthritis in Adults: A Population-Based Study in Southern Thailand

Boonsin Tangtrakulwanich MD*, Poramet Suwanno MD*

Affiliation : * Department of Orthopaedic Surgery and Physical Medicine, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand

Objective : Study the epidemiology and factors associated with patellofemoral osteoarthritis. Material and Method: A population-based survey was undertaken in Songkhla, a province in the southern part of Thailand. Residents aged 40 years and older were sampled using primary care units as a primary sampling frame, stratified by age and sex. All participants were taken to a private clinic for an interview and radiographic examination, including anterior- posterior, lateral and skyline views of both knees. Types and severities of involvement in each compartment were graded by one musculoskeletal radiologist.
Results : Of the eligible 694 subjects, 576 (81.4%) agreed to participate in the present study. The prevalence of radiographic patellofemoral osteoarthritis was 37.9%, of which 96% was bilateral involvement. Isolated patellofemoral osteoarthritis was the most common pattern in males (18.0%), while the combined pattern (involvement of both tibiofemoral and patellofemoral compartments) was the most common pattern in females (31.2%). Elderly (OR = 8.8, 95% CI: 5.1-15.3) and obese (OR = 7.9, 95% CI: 3.3-15.3) were independent risk factors predicting patellofemoral osteoarthritis.
Conclusion : There was a high prevalence of patellofemoral osteoarthritis among Thais over 40 years of age, associated with age and obesity.

Keywords : Epidemiology, Risk factors, Patellofemoral osteoarthritis

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