Graduate School of Medicine, Pontifícia Universidade Católica do Rio, Grande do Sul, Avenida Ipiranga, 6690, Porto Alegre, RS, Brazil, CEP 90610-000.
AJR Am J Roentgenol. 2011 Jan;196(1):W61-5. doi: 10.2214/AJR.10.4928.
The knee is the joint that is most frequently injured in boys 12-15 years old who practice soccer, and MRI is an accurate method of diagnosing sports-related injuries. The objective of this cross-sectional case-control study was to evaluate the knees of asymptomatic adolescent soccer players using open MRI.
We evaluated 56 knees of 28 asymptomatic male adolescents 14-15 years old. Participants were divided into two groups and paired by age and weight: soccer players (28 knees) and control subjects (28 knees). All the examinations were performed using a 0.35-T open-field MRI unit and were evaluated by two experienced radiologists blinded to study groups. Bone marrow signal, articular cartilage, meniscus, and fat pad abnormalities and the amount of fluid were assessed.
In the group of soccer players, 18 knees (64.3%) had one or more MRI abnormalities, whereas in the control group nine knees (32.1%) had at least one MRI abnormality (p = 0.03). The prevalence of bone marrow edema was much greater in the group of soccer players (14 knees, 50%), whereas the same abnormality was found in only one knee (3.6%) in the control group (p = 0.0001). Other abnormalities that were not statistically significant with regard to study group were also found in the two groups: infrapatellar fat pad edema, popliteal cysts, and ganglion cysts.
Bone marrow edema is a prevalent abnormal finding on MRI scans of knees of asymptomatic adolescent soccer players. MRI findings should be interpreted cautiously and in close correlation with clinical findings.
在进行足球运动的 12-15 岁男孩中，膝关节是最常受伤的关节，MRI 是一种准确的诊断运动相关损伤的方法。本横断面病例对照研究的目的是使用开放式 MRI 评估无症状青少年足球运动员的膝关节。
我们评估了 28 名 14-15 岁无症状男性青少年的 56 个膝关节。参与者根据年龄和体重分为两组并进行配对：足球运动员（28 个膝关节）和对照组（28 个膝关节）。所有检查均使用 0.35-T 开放式 MRI 单元进行，并由两名经验丰富的放射科医生进行评估，他们对研究组不知情。评估了骨髓信号、关节软骨、半月板和脂肪垫异常以及液体量。
在足球运动员组中，18 个膝关节（64.3%）存在一种或多种 MRI 异常，而对照组中 9 个膝关节（32.1%）至少存在一种 MRI 异常（p = 0.03）。骨髓水肿在足球运动员组中更为常见（14 个膝关节，50%），而对照组中仅 1 个膝关节（3.6%）存在相同的异常（p = 0.0001）。两组还发现了其他无统计学意义的异常：髌下脂肪垫水肿、腘窝囊肿和腱鞘囊肿。
骨髓水肿是无症状青少年足球运动员膝关节 MRI 扫描中常见的异常发现。MRI 结果应谨慎解读，并与临床发现密切相关。
