Document Detail

Magnetic resonance histologic correlation in rotator cuff tendons.
MedLine Citation:
PMID:  20578021     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To relate histologic changes in rotator cuff tendons to the appearance on T1-weighted as well as fat-suppressed T2-weighted and proton density-weighted magnetic resonance imaging (MRI) sequences. MATERIALS AND METHODS: T1-weighted, fat-suppressed T2-weighted and fat-suppressed proton density-weighted sequences of 18 cadaveric shoulders were acquired. The supraspinatus, infraspinatus, and subscapularis tendons were evaluated histologically. Twenty-six abnormalities were found in 23 of 37 tendons. In addition, histologically normal tendon parts (n = 32), including three segments with normal histology but abnormal MR signal, considered to represent magic angle effects, were defined. All regions of interest (ROIs) were evaluated by two musculoskeletal radiologists independently and blinded to histology. RESULTS: In the 26 areas with anatomically intact tendons but abnormal histological findings mucoid degeneration (n = 13), chondroid metaplasia (n = 11), fatty infiltration (n = 1), and foreign-body granuloma (n = 1) after tendon suture were found. Compared to normal tendon, mucoid degeneration was hyperintense on T2-weighted fat-suppressed (P = 0.007) and on proton density-weighted fat-suppressed images (P = 0.006). Chondroid metaplasia was hyperintense compared to normal tendon in all sequences (P < 0.05). Mucoid degeneration was hypointense compared to chondroid metaplasia on T2-weighted fat-suppressed images (P = 0.038) and hypointense compared to magic angle artifacts on T1-weighted images (P = 0.046). CONCLUSION: Chondroid metaplasia of rotator cuff tendons appears to be more common than expected. Both mucoid degeneration and chondroid metaplasia may explain increased tendon signal on MR images of the rotator cuff.
Florian M Buck; Holger Grehn; Monika Hilbe; Christian W A Pfirrmann; Silvana Manzanell; Juerg Hodler
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of magnetic resonance imaging : JMRI     Volume:  32     ISSN:  1522-2586     ISO Abbreviation:  J Magn Reson Imaging     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-06-29     Completed Date:  2010-10-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9105850     Medline TA:  J Magn Reson Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  165-72     Citation Subset:  IM    
Copyright Information:
(c) 2010 Wiley-Liss, Inc.
Department of Radiology, Orthopedic University Hospital Balgrist, Zurich, Switzerland.
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MeSH Terms
Granuloma, Foreign-Body / diagnosis
Magnetic Resonance Imaging / methods*
Observer Variation
Rotator Cuff / injuries,  pathology*
Tendon Injuries / diagnosis*
Tendons / pathology*

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