Edward B. Singleton Department of Radiology, Texas Children's Hospital, 6701 Fannin St., Suite 470, Houston, TX, 77030, USA.
Department of Orthopedic Surgery, Texas Children's Hospital, Houston, TX, USA.
Pediatr Radiol. 2021 Jun;51(7):1237-1242. doi: 10.1007/s00247-020-04942-4. Epub 2021 Feb 17.
Bassett's ligament is an accessory fascicle of the anterior inferior tibiofibular ligament. The prevalence, normal thickness and clinical implications of a thickened ligament have not been described in the pediatric radiology literature.
The purpose of this study was to determine the prevalence and thickness of Bassett's ligament in pediatric patients with magnetic resonance imaging (MRI) findings of lateral talar osteochondral lesions, medial talar osteochondral lesions and posterior ankle impingement, to compare these measurements with normal MRIs, and to compare the reproducibility of these measurements.
This is a retrospective study of pediatric ankle MRIs with four cohorts containing 21 patients each. All MRIs were retrospectively reviewed by a pediatric musculoskeletal radiologist and a pediatric radiology fellow. The prevalence of Bassett's ligament and its axial thickness were obtained for each cohort with repeat measurements for intra-observer and interobserver variability. Average thickness and standard deviation of Bassett's ligament were calculated.
The prevalence of Bassett's ligament and its thickness in each cohort were (mean±standard deviation): lateral osteochondral lesions, 71% (15/21), 1.9±0.5 mm; medial osteochondral lesions, 52% (11/21), 1.4±0.2 mm; posterior impingement, 52% (11/21), 1.3±0.2 mm; and normal ankle examinations, 71% (15/21), 1.5±0.4 mm. The thickness of Bassett's ligament was increased in the lateral talar osteochondral lesion group when compared to normal (P=0.02), while thickness in the medial osteochondral lesion and posterior impingement groups was not significant when compared to normal. The repeat measurements showed no significant difference in intra-observer and interobserver variability.
Bassett's ligament is a normal structure in children. Thickening of Bassett's ligament is seen with lateral osteochondral lesions and may be an indirect sign of anterolateral tibiotalar capsule injury.
Bassett 韧带是前下胫腓韧带的一个附属束。在儿科放射学文献中，尚未描述增厚的 Bassett 韧带的流行程度、正常厚度和临床意义。
本研究的目的是确定患有外侧距骨骨软骨病变、内侧距骨骨软骨病变和后踝撞击症的儿童患者的 Bassett 韧带的流行程度和厚度，与正常 MRI 进行比较，并比较这些测量值的可重复性。
这是一项对儿科踝关节 MRI 的回顾性研究，共分为四个队列，每个队列包含 21 例患者。所有 MRI 均由一名儿科肌肉骨骼放射科医生和一名儿科放射科医师进行回顾性审查。为每个队列获得 Bassett 韧带的存在和其轴位厚度，并进行重复测量以评估观察者内和观察者间的变异性。计算 Bassett 韧带的平均厚度和标准差。
各队列中 Bassett 韧带的存在率及其厚度分别为（平均值±标准差）：外侧骨软骨病变组，71%（15/21），1.9±0.5 毫米；内侧骨软骨病变组，52%（11/21），1.4±0.2 毫米；后踝撞击症组，52%（11/21），1.3±0.2 毫米；正常踝关节检查组，71%（15/21），1.5±0.4 毫米。与正常组相比，外侧距骨骨软骨病变组的 Bassett 韧带厚度增加（P=0.02），而内侧骨软骨病变组和后踝撞击症组的厚度与正常组相比则无显著差异。重复测量结果显示观察者内和观察者间的变异性无显著差异。
Bassett 韧带是儿童的正常结构。外侧距骨骨软骨病变时可见 Bassett 韧带增厚，可能是前外侧胫距关节囊损伤的间接征象。
