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Magic angle effect in MR imaging of ankle tendons: influence of foot positioning on prevalence and site in asymptomatic subjects and cadaveric tendons


Mengiardi, Bernard; Pfirrmann, Christian W A; Schöttle, Philip B; Bode, Beata; Hodler, Juerg; Vienne, Patrick; Zanetti, Marco (2006). Magic angle effect in MR imaging of ankle tendons: influence of foot positioning on prevalence and site in asymptomatic subjects and cadaveric tendons. European Radiology, 16(10):2197-2206.

Abstract

The influence of foot positioning on prevalence of the magic angle effect (MAE) in ankle tendons was investigated. In 30 asymptomatic volunteers and five cadaveric feet, MR imaging of the ankle was performed in the supine (neutral position of the foot) and prone (plantar-flexed foot) position. MAE was considered if increased T1-weighted signal at a certain site was seen in one position only. Histological correlation was obtained at 25 sites of the cadaveric posterior tibialis tendons (PTT). MAE occurred in 6/30 vs 1/30 (supine vs prone) anterior tibialis tendons (ATT), 30/30 vs 0/30 extensor hallucis longus and 27/30 vs 0/30 extensor digitorum longus tendons, 29/30 vs 0/30 PTTs, 30/30 vs 0/30 flexor digitorum and flexor hallucis longus tendons, 30/30 vs 1/30 peroneus brevis and 23/30 vs 1/30 peroneus longus tendons. At 12/25 cadaveric PTT sites where MAE was exclusively responsible for the increased signal, histology revealed normal tissue (11/12) or minimal degeneration (1/12). In conclusion, the supine body position with neutral position of the foot, a high prevalence (77-100%) of MAE in ankle tendons except for the ATT (20%) is seen. MAE is almost absent in the prone body position with plantar flexion of the foot

Abstract

The influence of foot positioning on prevalence of the magic angle effect (MAE) in ankle tendons was investigated. In 30 asymptomatic volunteers and five cadaveric feet, MR imaging of the ankle was performed in the supine (neutral position of the foot) and prone (plantar-flexed foot) position. MAE was considered if increased T1-weighted signal at a certain site was seen in one position only. Histological correlation was obtained at 25 sites of the cadaveric posterior tibialis tendons (PTT). MAE occurred in 6/30 vs 1/30 (supine vs prone) anterior tibialis tendons (ATT), 30/30 vs 0/30 extensor hallucis longus and 27/30 vs 0/30 extensor digitorum longus tendons, 29/30 vs 0/30 PTTs, 30/30 vs 0/30 flexor digitorum and flexor hallucis longus tendons, 30/30 vs 1/30 peroneus brevis and 23/30 vs 1/30 peroneus longus tendons. At 12/25 cadaveric PTT sites where MAE was exclusively responsible for the increased signal, histology revealed normal tissue (11/12) or minimal degeneration (1/12). In conclusion, the supine body position with neutral position of the foot, a high prevalence (77-100%) of MAE in ankle tendons except for the ATT (20%) is seen. MAE is almost absent in the prone body position with plantar flexion of the foot

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Item Type:Journal Article, refereed, original work
Communities & Collections:National licences > 142-005
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:1 October 2006
Deposited On:19 Dec 2018 16:06
Last Modified:24 Sep 2019 23:46
Publisher:Springer
ISSN:0938-7994
OA Status:Green
Publisher DOI:https://doi.org/10.1007/s00330-006-0164-y
Related URLs:https://www.swissbib.ch/Search/Results?lookfor=nationallicencespringer101007s003300060164y (Library Catalogue)
PubMed ID:16568266

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