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Abstract Number: 98

Prevalence Of Femoroacetabular Impingement Among Chinese Living In Vancouver, Canada: A Population-Based Study

Linda C. Li1, Jacek A. Kopec2, Hubert Wong3, Jolanda Cibere4, Charlie Zhang5, Eric C. Sayre2, Joanna Ye2, Morgan Barber2, Helen Prlic6 and John Esdaile7, 1Physical Therapy, Arthritis Centre of Canada, Richmond, BC, Canada, 2Arthritis Research Centre of Canada, Richmond, BC, Canada, 3School of Population and Public Health, University of British Columbia, St Paul's Hospital, University of British Columbia, Vancouver, V6Z 1Y6, Canada, Vancouver, BC, Canada, 4Division of Rheumatology, Arthritis Research Centre of Canada, Richmond, BC, Canada, 5Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada, 6Arthritis Research Centre of Canada, Vancouver, BC, Canada, 7Rheumatology, Arthritis Research Centre of Canada, University of British Columbia, Richmond, BC, Canada

Meeting: 2013 ACR/ARHP Annual Meeting

Keywords: Hip, hip disorders, osteoarthritis and pain

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Session Information

Title: Epidemiology and Health Services I

Session Type: Abstract Submissions (ACR)

Background/Purpose: Femoroacetabular Impingement (FAI) is one source of hip pain in young adults and has been suggested as a major cause of hip osteoarthritis (OA). Studies have shown that the prevalence of FAI was over 50% in populations with established OA1-3 and 45% in a primarily Caucasian population in Denmark4. Radiographic hip OA is extremely rare in Chinese; however, the prevalence of radiographic FAI in the Chinese population is unknown. The current study aims to estimate the prevalence of hip pain and FAI among Chinese living in Metro Vancouver, Canada (population=2.3 million, 2011 Census), where 19% of the population are ethnic Chinese. Over 25% of new immigrants to Vancouver in the past 5 years were from mainland China.

Methods: This study was conducted within IMPAKT-HiP*, a large multi-faceted study on the role of FAI and physical activity in cartilage damage and hip pain. Chinese participants were recruited in a cross-sectional telephone survey of a random sample of residents in Metro Vancouver. Individuals were eligible if they were between the age of 20 and 49, reported both parents were Chinese descent, and were available for an onsite assessment and x-ray session. Pregnant women were excluded. All calls were initiated in English. Non-English-speaking Chinese respondents received a second call by an interviewer fluent in Mandarin and Cantonese to assess eligibility. Participants were asked if they had any pain, stiffness or discomfort in the groin or the front of the upper thigh (i.e., hip pain) in the past 12 months. All hip x-rays were read by a trained reader using a standardized protocol. Pincer-type FAI was defined by: 1) presence of focal acetabular retroversion or 2) a lateral center edge angle >40⁰. Cam-type FAI was defined by an alpha angle >55⁰. Prevalence of hip pain and FAI were defined by participant, with a case represented by involvement of one or both hips.

Results: 201 eligible individuals (89 English-speaking, 112 Mandarin/Cantonese-speaking) were recruited between April 2012 and January 2013. The majority were women (n=134, 66.7%) with a mean age of 38.7 years (SD=9.0). 8 participants (4.0%) had been told they had hip OA by a health professional. Hip pain in the past 12 months was reported by 59 participants (29.4%; women=41, men=18). FAI was found in 76 individuals (37.8%; bilateral=55, 27.4%; unilateral=21, 10.4%). FAI was present in 44/134 women and 32/67 men. 58 participants (28.9%) had pincer FAI, 13 (6.5%) had cam FAI and 5 (2.5%) had mixed FAI.  

Conclusion:   Our findings contribute new information on the prevalence of FAI among Chinese living in North America.  Further research to examine prevalence of FAI, using standardized methodologies, in populations with high (e.g., Aboriginal populations) vs. low hip OA prevalence may provide further insight into the cause of hip OA. 

*IMPAKT-HiP=Investigations of Mobility, Physical Activity, and Knowledge Translation in Hip Pain


Disclosure:

L. C. Li,
None;

J. A. Kopec,
None;

H. Wong,
None;

J. Cibere,

IBEX Pharmaceuticals, Inc.,

9;

C. Zhang,
None;

E. C. Sayre,
None;

J. Ye,
None;

M. Barber,
None;

H. Prlic,
None;

J. Esdaile,
None.

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