MRI differentiates femoral condylar ossification evolution from osteochondritis dissecans. A new sign
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Lennart B. O. Jans & Jacob L. Jaremko & Michael Ditchfield &Wouter C. Huysse Koenraad L. Verstraete
- چاپ و سال / کشور: 2011
Description
Objective To determine ifMRI (magnetic resonance imaging) of the femoral condyles in children can differentiate variations in ossification from osteochondritis dissecans (OCD). Methods MRI studies of the knee of 315 patients demonstrated ossification defects of the femoral condyles involving the subchondral boneplate.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. Results (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. Conclusion MRI may help differentiate variations in ossification of the femoral condyles from OCD.
Eur Radiol (2011) 21:1170–1179 DOI 10.1007/s00330-011-2058-x Received: 10 September 2010 / Accepted: 27 November 2010 / Published online: 26 January 2011
