Epidemiology of Generalized Ligamentous Laxity in Iran: A National Study Including Different Iranian Ethnic Groups and its Relationship with Musculoskeletal Disorders

Background: Ligamentous laxity is a condition that leads to joints’ hypermobility beyond their average and normal range of motion. It can cause musculoskeletal and joint injuries. This national multi-centered study investigated the epidemiology of generalized ligamentous laxity and its relationship with musculoskeletal disorders among Iranian adults with different ethnic backgrounds.Methods: A total of ۱,۴۸۸ people (age range: ۱۷-۴۰ years) were selected from eight cities and six different ethnicities of Iran and included in this cross-sectional study. The presence of ligamentous laxity with clinical examinations was searched according to Beighton score criteria. They were also examined for any kind of musculoskeletal disorders that might accompany ligamentous laxity. The Chi-square test was used to compare the frequency of ligamentous laxity based on gender and ethnicity; moreover, the t-test was utilized to compare the frequency of ligamentous laxity based on age.Results: In total, ۲۸۰ (۱۸.۸%) participants had generalized ligamentous laxity, and it was more prevalent in women (۲۲.۷%), compared to men (۱۴.۴%). Regarding ethnicity, the highest and lowest prevalence rates were in Gilak (۳۷.۹%) and Persian-Arab (۶%) ethnicities, respectively (P<۰.۰۰۱). Ligamentous laxity showed a significant relationship with sports injury, joint complaint, joint dislocation, ligament sprain, sciatica and back pain, Baker’s cyst, and varicose veins (P<۰.۰۰۱). Most participants with generalized ligamentous laxity (۹۳.۶%) had no knowledge of their problem and its importance in choosing an appropriate sports activity. Conclusion: The prevalence of generalized ligamentous laxity seems to be relatively high among the ۱۷-۴۰-year-old population of Iran, especially in women. It seems to be significantly related to ethnicity. It is strongly recommended that examinations, screening, and information be provided at an early age in schools or at least in areas with a high prevalence as national programs. Level of evidence: I

Keywords:

Ethnicity , hypermobility , Iran , joint laxity , Ligamentous laxity