Abstract：
OBJECTIVE: To report the prevalence of MRI features commonly associated with posterior ankle impingement syndrome in elite ballet dancers and athletes and to compare findings between groups.
METHODS: Thirty-eight professional ballet dancers (47.4% women) were age- and sex-matched to 38 elite soccer or cricket fast bowler athletes. All participants were training, playing, and performing at full workload and underwent 3.0-T standardised magnetic resonance imaging of one ankle. De-identified images were assessed by one senior musculoskeletal radiologist for findings associated with posterior ankle impingement syndrome (os trigonum, Stieda process, posterior talocrural and subtalar joint effusion-synovitis, flexor hallucis longus tendon pathology and tenosynovitis, and posterior ankle bone marrow oedema). Imaging scoring reliability testing was performed.
RESULTS: Posterior talocrural effusion-synovitis (90.8%) and subtalar joint effusion-synovitis (93.4%) were common in both groups, as well as the presence of either an os trigonum or Stieda process (61.8%). Athletes had a higher prevalence of either os trigonum or Stieda process than dancers (74%, 50% respectively, P = 0.03). Male athletes had a higher prevalence of either os trigonum or Stieda process than male dancers (90%, 50% respectively, P = 0.01), or female athletes (56%, P = 0.02). Posterior subtalar joint effusion-synovitis size was larger in dancers than athletes (P = 0.02). Male and female dancers had similar imaging findings. There was at least moderate interobserver and intraobserver agreement for most MRI findings.
CONCLUSIONS: Imaging features associated with posterior impingement were prevalent in all groups. The high prevalence of os trigonum or Stieda process in male athletes suggests that this is a typical finding in this population.
METHODS: Thirty-eight professional ballet dancers (47.4% women) were age- and sex-matched to 38 elite soccer or cricket fast bowler athletes. All participants were training, playing, and performing at full workload and underwent 3.0-T standardised magnetic resonance imaging of one ankle. De-identified images were assessed by one senior musculoskeletal radiologist for findings associated with posterior ankle impingement syndrome (os trigonum, Stieda process, posterior talocrural and subtalar joint effusion-synovitis, flexor hallucis longus tendon pathology and tenosynovitis, and posterior ankle bone marrow oedema). Imaging scoring reliability testing was performed.
RESULTS: Posterior talocrural effusion-synovitis (90.8%) and subtalar joint effusion-synovitis (93.4%) were common in both groups, as well as the presence of either an os trigonum or Stieda process (61.8%). Athletes had a higher prevalence of either os trigonum or Stieda process than dancers (74%, 50% respectively, P = 0.03). Male athletes had a higher prevalence of either os trigonum or Stieda process than male dancers (90%, 50% respectively, P = 0.01), or female athletes (56%, P = 0.02). Posterior subtalar joint effusion-synovitis size was larger in dancers than athletes (P = 0.02). Male and female dancers had similar imaging findings. There was at least moderate interobserver and intraobserver agreement for most MRI findings.
CONCLUSIONS: Imaging features associated with posterior impingement were prevalent in all groups. The high prevalence of os trigonum or Stieda process in male athletes suggests that this is a typical finding in this population.
摘要：
目的：报告精英芭蕾舞演员和运动员中通常与后踝关节撞击综合征相关的MRI特征的患病率，并比较组间的发现。
方法：38名专业芭蕾舞演员（47.4％的女性）与38名精英足球或板球快速投球运动员的年龄和性别相匹配。所有参与者都在训练，玩耍,并在全工作量下进行，并对一个踝关节进行了3.0T标准化磁共振成像。一位高级肌肉骨骼放射科医生评估了与后踝关节撞击综合征相关的未识别图像（三角，Stieda工艺,后距骨膜和距下关节积液-滑膜炎，长屈肌腱病理学和腱鞘炎，和后踝骨髓水肿）。进行影像学评分可靠性测试。
结果：两组均常见后滑膜炎（90.8%）和距下关节滑膜炎（93.4%），以及存在奥氏三角或Stieda过程(61.8%)。运动员的三角或Stieda过程的患病率高于舞者（74％，分别为50%,P=0.03)。男性运动员的三角或Stieda过程的患病率高于男性舞者（90％，分别为50%,P=0.01),或女运动员(56%，P=0.02)。舞者的距下后关节积液-滑膜炎大小大于运动员（P=0.02）。男性和女性舞者的影像学发现相似。对于大多数MRI发现，至少有适度的观察者之间和观察者之间的一致性。
结论：与后撞击相关的影像学特征在所有组中都很普遍。男性运动员中三角或Stieda过程的患病率很高，这表明这是该人群中的典型发现。
方法：38名专业芭蕾舞演员（47.4％的女性）与38名精英足球或板球快速投球运动员的年龄和性别相匹配。所有参与者都在训练，玩耍,并在全工作量下进行，并对一个踝关节进行了3.0T标准化磁共振成像。一位高级肌肉骨骼放射科医生评估了与后踝关节撞击综合征相关的未识别图像（三角，Stieda工艺,后距骨膜和距下关节积液-滑膜炎，长屈肌腱病理学和腱鞘炎，和后踝骨髓水肿）。进行影像学评分可靠性测试。
结果：两组均常见后滑膜炎（90.8%）和距下关节滑膜炎（93.4%），以及存在奥氏三角或Stieda过程(61.8%)。运动员的三角或Stieda过程的患病率高于舞者（74％，分别为50%,P=0.03)。男性运动员的三角或Stieda过程的患病率高于男性舞者（90％，分别为50%,P=0.01),或女运动员(56%，P=0.02)。舞者的距下后关节积液-滑膜炎大小大于运动员（P=0.02）。男性和女性舞者的影像学发现相似。对于大多数MRI发现，至少有适度的观察者之间和观察者之间的一致性。
结论：与后撞击相关的影像学特征在所有组中都很普遍。男性运动员中三角或Stieda过程的患病率很高，这表明这是该人群中的典型发现。
