Epidemiology and risk factors of patellofemoral osteoarthritis in adults: a population-based study in southern Thailand.
OBJECTIVE
Study the epidemiology and factors associated with patellofemoral osteoarthritis.


METHODS
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.


CONCLUSIONS
There was a high prevalence of patellofemoral osteoarthritis among Thais over 40 years of age, associated with age and obesity.
Department of Orthopaedic Surgery and Physical Medicine, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand. boonsin.b@psu.ac.th
Boonsin
B
Tangtrakulwanich
Poramet
P
Suwanno
D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000453:epidemiology; D020370:Osteoarthritis, Knee / Q000453:epidemiology* / Q000503:physiopathology; D057071:Patellofemoral Joint / Q000503:physiopathology*; D012307:Risk Factors; D013785:Thailand / Q000453:epidemiology