Department of Radiology and Medical Imaging, Ghent University Hospital, De Pintelaan 185, 9000, Ghent, Belgium.
Eur Radiol. 2011 Jun;21(6):1170-9. doi: 10.1007/s00330-011-2058-x. Epub 2011 Jan 26.
To determine if MRI (magnetic resonance imaging) of the femoral condyles in children can differentiate variations in ossification from osteochondritis dissecans (OCD).
MRI studies of the knee of 315 patients demonstrated ossification defects of the femoral condyles involving the subchondral bone plate. MRI features categorized the defects as ossification variability (N = 150) or OCD (N = 165). Both groups were compared for age, residual physeal cartilage, site, configuration, 'lesion angle' and associated findings.
(a) Ossification variability did not occur in girls >10 year. and boys >13 year., OCD did not occur in children younger than 8 year. (b) Ossification variability was not seen in patients with 10% or less residual physeal cartilage, OCD was rare in patients with 30% or greater residual physeal cartilage. (c) Ossification variability was located in the posterior third of the femoral condyle, OCD occurred most commonly in the middle third. (d) Intracondylar extension was seen in OCD and not in ossification variability. (e) Perilesional oedema was very common with OCD and absent with ossification variability. (f) Lesion angle <105° was a feature of ossification variability.
MRI may help differentiate variations in ossification of the femoral condyles from OCD.
确定儿童股骨髁的 MRI（磁共振成像）是否能区分骨化变异与骺软骨骨软骨病（OCD）。
对 315 例膝关节 MRI 研究显示股骨髁存在涉及软骨下骨板的骨化缺陷。MRI 特征将这些缺陷分为骨化变异（N=150）或 OCD（N=165）。比较两组的年龄、残余骺软骨、部位、形态、“病变角度”和相关发现。
（a）骨化变异在女孩>10 岁和男孩>13 岁时不会发生，OCD 在 8 岁以下的儿童中不会发生。（b）骨化变异在残余骺软骨<10%的患者中未见到，OCD 在残余骺软骨>30%的患者中很少见。（c）骨化变异位于股骨髁的后三分之一，OCD 最常见于中三分之一。（d）髁内延伸见于 OCD，而不见于骨化变异。（e）病变周围水肿在 OCD 中很常见，而在骨化变异中不存在。（f）病变角度<105°是骨化变异的特征。
MRI 可能有助于区分股骨髁的骨化变异与 OCD。
