Johansson Fredrik R, Skillgate Eva, Adolfsson Anders, Jenner Göran, DeBri Edin, Swärdh Leif, Cools Ann M
Department of Rehabilitation Sciences and Physiotherapy, Ghent University, Belgium;
Institute of Environmental Medicine, Stockholm, Sweden;
J Athl Train. 2015 Dec;50(12):1299-305. doi: 10.4085/1062-6050-51.1.07. Epub 2015 Dec 10.
Tennis is an asymmetric overhead sport with specific muscle-activation patterns, especially eccentrically in the rotator cuff. Magnetic resonance imaging (MRI) findings in asymptomatic adolescent elite tennis players have not previously been reported.
The first aim of the study was to describe MRI findings regarding adaptations or abnormalities, as well as muscle cross-sectional area (CSA), of the rotator cuff. The second aim of the study was to investigate the rotator cuff based on the interpretation of the MRI scans as normal versus abnormal, with the subdivision based on the grade of tendinosis, and its association with eccentric rotator cuff strength in the dominant arm (DA) of the asymptomatic elite adolescent tennis player.
Testing environment at the radiology department of Medicinsk Röntgen AB.
Thirty-five asymptomatic elite tennis players (age = 17.4 ± 2.7 years) were selected based on ranking and exposure time.
INTERVENTION(S): We assessed MRI scans and measured the CSA of the rotator cuff muscle. The non-DA (NDA) was used as a control. In addition, eccentric testing of the external rotators of the DA was performed with a handheld dynamometer.
The DA and NDA displayed different frequencies of infraspinatus tendinosis (grade 1 changes) (P < .05). Rotator cuff measurements revealed larger infraspinatus and teres minor CSA (P < .05) in the DA than in the NDA. Mean eccentric external-rotation strength in the DA stratified by normal tendon and tendinosis was not different between groups (P = .723).
Asymptomatic adolescent elite tennis players demonstrated infraspinatus tendinosis more frequently in the DA than in the NDA. Clinicians must recognize these tendon changes in order to modify conditioning and performance programs appropriately.
网球是一项不对称的过顶运动，具有特定的肌肉激活模式，尤其是在肩袖肌群中存在离心激活模式。此前尚未报道过无症状青少年精英网球运动员的磁共振成像（MRI）检查结果。
本研究的首要目的是描述肩袖肌群的适应性改变或异常情况以及肌肉横截面积（CSA）的MRI检查结果。其次要目的是根据MRI扫描结果将肩袖肌群判定为正常或异常，并依据肌腱病分级进行细分，研究其与无症状青少年精英网球运动员优势手臂（DA）的肩袖肌群离心力量之间的关联。
Medicinsk Röntgen AB放射科的测试环境。
根据排名和参赛时长，选取了35名无症状的精英网球运动员（年龄 = 17.4 ± 2.7岁）。
我们评估了MRI扫描结果，并测量了肩袖肌群的CSA。将非优势手臂（NDA）作为对照。此外，使用手持测力计对DA的外旋肌进行了离心测试。
DA和NDA显示出不同频率的冈下肌腱病（1级改变）（P < .05）。肩袖肌群测量结果显示，DA的冈下肌和小圆肌CSA大于NDA（P < .05）。根据正常肌腱和肌腱病分层的DA平均离心外旋力量在各组之间无差异（P = .723）。
无症状青少年精英网球运动员中，DA的冈下肌腱病发生率高于NDA。临床医生必须认识到这些肌腱变化，以便适当地调整训练和表现计划。
