OSSEOUS LESIONS ASSOCIATED WITH ANTERIOR CRUCIATE LIGAMENT INJURIES -ASSESSMENT BY MAGNETIC-RESONANCE-IMAGING AT VARIOUS PERIODS AFTER INJURIES

Citation
K. Nawata et al., OSSEOUS LESIONS ASSOCIATED WITH ANTERIOR CRUCIATE LIGAMENT INJURIES -ASSESSMENT BY MAGNETIC-RESONANCE-IMAGING AT VARIOUS PERIODS AFTER INJURIES, Archives of orthopaedic and trauma surgery, 113(1), 1993, pp. 1-4
Citations number
6
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Orthopedics,Surgery
ISSN journal
0936-8051
Volume
113
Issue
1
Year of publication
1993
Pages
1 - 4
Database
ISI
SICI code
0936-8051(1993)113:1<1:OLAWAC>2.0.ZU;2-X
Abstract
In 56 patients with anterior cruciate ligament (ACL) rupture, we retro spectively examined osseous lesions secondary to the rupture using mag netic resonance imaging (MRI). Depending on the time from their ligame ntous injury to the performance of MRI, the patients were divided into three groups: the acute group (less than 1 month, n = 20), the subacu te group (between 1 and 12 months, n = 16), and the chronic group (12 months or more, n = 20). Occult osseous lesions which were not detecte d by roentgenography were revealed by MRI in 14 patients in the acute group (70.0%), 5 in the subacute group (31.3%), and 1 in the chronic g roup (5%). The detection rate of osseous lesions by MRI was significan tly higher in the acute group than in the other groups (P < 0.001). Os seous lesions were always detected in the same locations of the latera l compartment of the knee joint. When examined by arthroscopy, these l esions were often found to be accompanied by articular cartilage injur ies. In the acute group, osseous lesions were visible in the high sign al intensity area of T2-weighted images and in the low signal intensit y area of proton density images. They were interpreted as representing hemorrhage and edema within the bane marrow. In the subacute and chro nic groups, the osseous lesions were smaller, and their signal intensi ty on T2-weighted images was lower than that in the acute group, proba bly reflecting the ongoing resorption of the hemorrhage and healing of the lesions. These results suggest that osseous lesions develop follo wing injury to the ACL. components of the knee joint such as the artic ular carti lage and the meniscus. On the other hand, osseous lesions s econdary to rupture of the ACL are difficult to assess with convention al imaging modalities. For this reason, there are many questions about these lesions, including whether or not they actually exist. Using ma gnetic resonance imaging (MRI), we examined the incidence of osseous l esions associated with injury to the ACL and analyzed their location a nd qualitative aspects. Based on these analyses, we discuss the pathop hysiology and the onset mechanism of these lesions.