MR imaging of Pellegrini-Stieda disease.
OBJECTIVE
To describe the MR imaging of Pellegrini-Stieda disease, a post-traumatic ossification of the medial collateral ligament with typical radiographic findings.


METHODS
Coronal and/or axial T2*-weighted field echo and T1-weighted conventional spin echo MR images were obtained with 1.5-Tesla or 0.5-Tesla units. Four patients with radiographic and clinical diagnoses of Pellegrini-Stieda disease were examined. Surgery was performed on one patient, and histopathologic correlation was obtained.


CONCLUSIONS
Delineating it as a signal void, T2*-weighted MR imaging indicated the precise extent of the osseous fragment in relation to the medial collateral ligament. T1-weighted imaging showed the presence of fatty marrow as a high signal region within the fragment, indicating maturity of the fragment. These findings may help to determine preoperative planning for resection of massive fragments around the ligament. Pellegrini-Stieda disease cannot be considered rare, since it is often encountered in daily MRI examinations.
Niitsu
M
M
Department of Radiology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan.
Ikeda
K
K
Iijima
T
T
Ochiai
N
N
Noguchi
M
M
Itai
Y
Y
D000328:Adult; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000150:complications*; D007719:Knee Joint / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008297:Male; D017888:Medial Collateral Ligament, Knee / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D009999:Ossification, Heterotopic / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery; D011859:Radiography