Department of Orthopaedic Surgery, Hospital Clínico Universidad de Chile, Santiago, Chile.
Department of Imaging, Musculoskeletal Radiology Unit, Hospital Clínico Universidad de Chile, Santiago, Chile.
Orthop J Sports Med. 2014 Oct 7;2(10):2325967114552800. doi: 10.1177/2325967114552800. eCollection 2014 Oct.
Femoroacetabular impingement (FAI) is the result of a mechanical conflict in the hip joint, and its diagnosis is based on clinical and radiological parameters. To our knowledge, there are no published studies describing the radiologic characteristics of FAI in Latin American populations.
To describe the radiological features associated with FAI in an asymptomatic Chilean population.
Cross-sectional study; Level of evidence, 3.
We prospectively recruited asymptomatic patients with no history or symptoms of hip pathology who underwent abdomen-pelvis computed tomography (CT) for a nonorthopaedic indication. The acetabular and femoral parameters related to FAI were measured.
We studied 101 subjects (202 hips) with a mean age of 36.8 ± 14.4 years. The mean center-edge angle was 39.4° ± 7.2°. The crossover sign was present in 34 cases (33.7%). The mean alpha angle was 49.7° ± 8.3°. Depending on the cut points chosen for FAI-related parameters, between 39.6% and 69.3% of an asymptomatic Chilean population were found to have morphological features related to FAI.
Our findings suggest that the proposed pathological threshold values in the literature cannot be extrapolated to a Chilean population, and this must be taken into consideration when evaluating Latin American patients with hip pain.
股骨髋臼撞击症（FAI）是髋关节机械性冲突的结果，其诊断基于临床和影像学参数。据我们所知，目前尚无研究描述拉丁美洲人群中 FAI 的放射学特征。
描述无症状智利人群中与 FAI 相关的放射学特征。
横断面研究；证据水平，3 级。
我们前瞻性招募了无髋关节病史或症状的无症状患者，这些患者因非骨科原因接受腹部-骨盆 CT 检查。测量与 FAI 相关的髋臼和股骨参数。
我们研究了 101 名受试者（202 髋），平均年龄为 36.8±14.4 岁。平均中心边缘角为 39.4°±7.2°。34 例存在交叉征（33.7%）。平均α角为 49.7°±8.3°。根据选择的 FAI 相关参数的截断值，39.6%至 69.3%的无症状智利人群存在与 FAI 相关的形态学特征。
我们的研究结果表明，文献中提出的病理性阈值值不能外推到智利人群，在评估有髋关节疼痛的拉丁美洲患者时必须考虑这一点。
