Inclusive Medical Science Research Institute, Morinomiya University of Medical Sciences, 1-26-16 Nankokita, Suminoe-ku, Osaka city, Osaka, 559-8611, Japan.
Department of Clinical Anatomy, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
Sci Rep. 2022 Apr 22;12(1):6656. doi: 10.1038/s41598-022-10718-7.
Although the flexion abduction external rotation (FABER) test is a useful hip provocation test, hip soft tissue characteristics in the FABER position remain unclear. This study investigated the in-vivo joint capsule characteristics, including its articular cavity area and relation to the fat pad surrounded by the joint capsule and pericapsular muscles, in the FABER position using magnetic resonance imaging. Thirteen hips from 13 healthy volunteers were analyzed. The images were obtained, with the participant hips at 15°-extension, 45°-flexion, and in the FABER position, to analyze the articular cavity size and fat pad and calculate these ratios to size of the femoral neck. The articular cavity area and its ratio to the femoral neck were significantly greatest in the FABER position, followed by those in the hip flexion and extension. Additionally, the area of the fat pad in the inter-pericapsular muscle space and its ratio to the femoral neck in the FABER position were significantly larger than those in the hip flexion and, as a tendency, larger than those in hip extension. To the best of our knowledge, this is the first in-vivo study to show the interrelationship among the joint capsule, pericapsular muscles, and fat pad in the FABER position.
虽然屈曲外展外旋（FABER）试验是一种有用的髋关节激发试验，但 FABER 体位下髋关节软组织的特征仍不清楚。本研究使用磁共振成像（MRI）研究了 FABER 体位下关节囊的特征，包括关节腔的面积及其与关节囊和关节囊周围肌肉包围的脂肪垫的关系。分析了 13 名健康志愿者的 13 个髋关节。在 15°伸展、45°屈曲和 FABER 体位下获取图像，以分析关节腔大小和脂肪垫，并计算这些与股骨颈的比值。FABER 体位下关节腔面积及其与股骨颈的比值最大，其次是髋关节屈曲和伸展。此外，FABER 体位下关节囊间隙内的脂肪垫面积及其与股骨颈的比值明显大于髋关节屈曲时的比值，且呈倾向于大于髋关节伸展时的比值。据我们所知，这是第一项显示 FABER 体位下关节囊、关节囊周围肌肉和脂肪垫之间相互关系的体内研究。
