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Visualization of Intraarticular Structures of the Acromioclavicular Joint in an Ex Vivo Model Using a Dedicated MRI Protocol

¹ Department of Traumatology, Medical University of Vienna and Vienna General Hospital, Waehringer Guertel 18–20, Vienna A-1090, Austria.
² Department of Radiology, Medical University of Vienna, Vienna, Austria.
³ Department of Orthopedics, Medical University of Vienna, Vienna, Austria.
⁴ Department of Anatomy, Medical University of Vienna, Vienna, Austria.

View larger version (92K): [in a new window]   Fig. 1A —MR images using different protocols. Images from cadaveric specimens 3 (A) and 5 (B). Presence of intraarticular fibrocartilaginous disk is confirmed by corresponding toluidine blue–stained sections. Arrows mark border between intraarticular disk and articular cartilage on acromial side. Images were acquired using dual T2- and proton density–weighted (upper left), dual T2-weighted turbo spin-echo (upper right), T2-weighted fast-field echo (lower left), and 3D water-selective (lower right) sequences. Center images show correlating histology sections.

View larger version (92K): [in a new window]   Fig. 1B —MR images using different protocols. Images from cadaveric specimens 3 (A) and 5 (B). Presence of intraarticular fibrocartilaginous disk is confirmed by corresponding toluidine blue–stained sections. Arrows mark border between intraarticular disk and articular cartilage on acromial side. Images were acquired using dual T2- and proton density–weighted (upper left), dual T2-weighted turbo spin-echo (upper right), T2-weighted fast-field echo (lower left), and 3D water-selective (lower right) sequences. Center images show correlating histology sections.

View larger version (151K): [in a new window]   Fig. 2A —Representative toluidine blue–stained histologic images of intraarticular structures in acromioclavicular joint from cadaveric specimens. Arrows indicate intraarticular fibrocartilaginous disk.

View larger version (146K): [in a new window]   Fig. 2B —Representative toluidine blue–stained histologic images of intraarticular structures in acromioclavicular joint from cadaveric specimens. and C, Representative immunohistochemistry of type II collagen-stained specimens indicates appearance of different cartilaginous structures. (Magnification, x1 [B] and x4 [C])

View larger version (161K): [in a new window]   Fig. 2C —Representative toluidine blue–stained histologic images of intraarticular structures in acromioclavicular joint from cadaveric specimens. Representative immunohistochemistry of type II collagen-stained specimens indicates appearance of different cartilaginous structures. (Magnification, x1 [B] and x4 [C])

View larger version (151K): [in a new window]   Fig. 3 —24-year-old asymptomatic male volunteer. Protocol was used in a manner identical to that used in ex vivo study. Superficial coil was fixed directly anterior to acromioclavicular joint. No evidence of major displacement due to respiration was observed. Arrows mark border between intraarticular disk and articular cartilage on lateral end of clavicle and acromion, respectively.

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