Linked Life Data

19026010

Source:http://linkedlifedata.com/resource/pubmed/id/19026010

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2009-5-12
pubmed:abstractText
Ischemia is the defined pathway leading to steroid-associated osteonecrosis (ON). Early detection of ischemic condition may help predict later ON occurrence. Bone marrow perfusion function evaluation by perfusion magnetic resonance imaging (MRI) may be a unique modality for this application. Twenty-five adult male New Zealand white rabbits were used in this study. Lipopolysaccharide (LPS) and methylprednisolone (MPS) were administrated for ON induction based on a published protocol. T1-weighted and fat suppression T2-weighted MR imaging (conventional MRI) were performed for ON lesion detection based on the abnormal signal in the proximal femora at week 0 as the baseline (before LPS injection), and week 1 and week 2 after MPS injection. At the same time, the blood perfusion function in the proximal femora was measured by perfusion MRI. Maximum enhancement (ME)--an index of MRI perfusion function was analyzed. After MRI scanning, the proximal femora were prepared histopathologically for ON lesion analysis. The rabbit with bilateral histopathological ON lesions was defined as an ON+ rabbit and included in the ON+ group evaluated at week 1 and week 2, respectively, and the rabbit without ON lesions in bilateral femora was classified into the ON- group. For the underlying mechanism of perfusion change, the extravascular marrow fat cells were measured and the intravascular endothelium inflammation injury indicator of tissue factor (TF) expression and thrombus formation were detected. In ON+ group, ME in perfusion MRI showed a significant decrease at week 1 and week 2 as compared with the baseline (p < 0.01). There was a more than 50% decrease in ME at week 1 in ON+ group; whereas there were no detectable ON lesions by conventional MRI at week 1, though 93% (14/15) rabbits could be detected at week 2 in ON+ group. In ON- group, ME showed a slight decrease at week 1 (less than 30%), and nearly recovered to normal at week 2 as compared with the baseline. Histological results showed a much larger average marrow fat area and more severe marrow blood sinusoids compression from surrounding crowded fat cells, and stronger positive TF expression in marrow endothelium and more thrombus formation in ON+ rabbits than ON- rabbits. This study demonstrated that functional perfusion MRI could predict development of steroid-associated ON. Our experimental data suggested that perfusion MRI might be a sensitive noninvasive modality for monitoring steroid-associated ON in patients.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1554-527X
pubmed:author
pubmed:copyrightInfo
Copyright 2008 Orthopaedic Research Society
pubmed:issnType
Electronic
pubmed:volume
27
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
742-7
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Functional perfusion MRI predicts later occurrence of steroid-associated osteonecrosis: an experimental study in rabbits.
pubmed:affiliation
Musculoskeletal Research Laboratory of the Department of Orthopaedics and Traumatology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't