Diesel Cristiano Valter, Ribeiro Tiango Aguiar, Scheidt Rodrigo Benedet, Macedo Carlos Alberto de Souza, Galia Carlos Roberto
2 Department of Orthopaedics, Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, Rio Grande do Sul - Brazil.
Hip Int. 2015 May-Jun;25(3):258-63. doi: 10.5301/hipint.5000250. Epub 2015 Apr 30.
There is a lack of uniformity in the diagnostic criteria for femoroacetabular impingement (FAI), and few studies discuss the prevalence of radiographic changes in asymptomatic individuals. These factors make it difficult to establish a natural history of this disease. The aim of this study was to assess the prevalence of radiographic signs of CAM and Pincer FAI in an asymptomatic population.
A cross-sectional study was performed from July 2013 to December 2013. A total of 185 subjects were analysed.
no history of hip pain or orthopedic disease; and being 20-60 years old.
athletically active; or patients who would not allow acquisition of appropriate radiographs for analysis. Radiographs were obtained in anteroposterior and Dünn 45° view to access: alpha angle (AA), triangular index (TI), crossover sign (CS), lateral-centre edge (LCE) angle and acetabular index (AI).
Median age was 34 years (27-49.5) and FAI was present in 53% of all subjects. 32.44% (60) was the overall CAM-type prevalence and 42.7% (79) the overall Pincer-type prevalence. Only 2 subjects presented the 3 overcoverage signs (AI, LCE and CS). An association was noted between the presence of AI <0° and the LCE >40° (p = 0.05).
Our study established a higher prevalence of radiographic markers of FAI in an asymptomatic population.
股骨髋臼撞击症（FAI）的诊断标准缺乏一致性，很少有研究探讨无症状个体中影像学改变的患病率。这些因素使得难以确定该疾病的自然病程。本研究的目的是评估无症状人群中凸轮型和钳夹型FAI影像学征象的患病率。
于2013年7月至2013年12月进行了一项横断面研究。共分析了185名受试者。
无髋部疼痛或骨科疾病史；年龄在20 - 60岁之间。
运动活跃；或不允许获取用于分析的合适X线片的患者。获取前后位和Dünn 45°位的X线片以测量：α角（AA）、三角指数（TI）、交叉征（CS）、外侧中心边缘（LCE）角和髋臼指数（AI）。
中位年龄为34岁（27 - 49.5岁），所有受试者中53%存在FAI。凸轮型总体患病率为32.44%（60例），钳夹型总体患病率为42.7%（79例）。仅2名受试者出现了3种覆盖过度征象（AI、LCE和CS）。发现AI < 0°与LCE > 40°之间存在关联（p = 0.05）。
我们的研究证实无症状人群中FAI影像学标志物的患病率较高。
