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- Title
Bone marrow changes related to disuse.
- Authors
Nardo, Lorenzo; Sandman, David N; Virayavanich, Warapat; Zhang, Linlin; Souza, Richard B; Steinbach, Lynne; Guindani, Michele; Link, Thomas M
- Abstract
<bold>Objectives: </bold>To evaluate bone marrow changes on knee magnetic resonance imaging (MRI) in patients with 3- to 6-week-long period of unloading.<bold>Methods: </bold>MRI knee examinations were performed in 30 patients (14 men, 16 women; aged 20-53 years) at baseline and 5-10 weeks after immobilisation of the ipsilateral lower extremity; subsets of patients were examined at additional time-points. Ten volunteers (4 men, 6 women; aged 20-50 years) were studied as control cohort at two time-points. Bone marrow signal abnormalities were analysed according to: (1) severity, (2) signal alteration relative to hyaline cartilage, (3) morphology, (4) increased vascularity in the knee joint and (5) T1-signal alteration. Spearman's rank correlation test (SRC) and Kendall's tau (KT) were used to compare individual scores.<bold>Results: </bold>All 30 patients presented abnormal bone marrow findings after unloading, which reached a peak at 10-25 weeks (P <0.001). These findings decreased within 1 year (P < 0.001). High scores of severity were associated with confluent and patchy patterns of bone marrow (SCR = 0.923, P < 0.001 and KT = 0.877, P <0.001).<bold>Conclusions: </bold>Signal abnormalities of the bone marrow related to unloading are consistent findings and most prominent 10-25 weeks following immobilisation when both confluent and patchy hyperintense patterns are present.
- Publication
European Radiology, 2013, Vol 23, Issue 12, p3422
- ISSN
0938-7994
- Publication type
journal article
- DOI
10.1007/s00330-013-2943-6