High resolution MRI imaging at 9.4 Tesla of the osteochondral unit in a translational model of articular cartilage repair

BMC Musculoskeletal Disorders

Henning Madry²  Arno Bücker¹  Andreas Müller¹  Lars Goebel² 

[1] Department of Diagnostic and Interventional Radiology, Saarland University Medical Center, Kirrberger Straße, Building 57, Homburg/Saar D-66421, Germany;Cartilage Net of the Greater Region, University of the Greater Region, Homburg/Saar D-66421, Germany

关键词: SGE 3D;    Marrow stimulation;    Cartilage defect;    Sheep;    High-field MRI;   

Others  :  1174845
DOI  :  10.1186/s12891-015-0543-0

 received in 2014-10-29, accepted in 2015-03-27,  发布年份 2015

【 摘 要 】

Background

Non-destructive structural evaluation of the osteochondral unit is challenging. Here, the capability of high-field magnetic resonance imaging (μMRI) at 9.4 Tesla (T) was explored to examine osteochondral repair ex vivo in a preclinical large animal model. A specific aim of this study was to detect recently described alterations of the subchondral bone associated with cartilage repair.

Methods

Osteochondral samples of medial femoral condyles from adult ewes containing full-thickness articular cartilage defects treated with marrow stimulation were obtained after 6 month in vivo and scanned in a 9.4 T μMRI. Ex vivo imaging of small osteochondral samples (typical volume: 1–2 cm³) at μMRI was optimised by variation of repetition time (TR), time echo (TE), flip angle (FA), spatial resolution and number of excitations (NEX) from standard MultiSliceMultiEcho (MSME) and three-dimensional (3D) spoiled GradientEcho (SGE) sequences.

Results

A 3D SGE sequence with the parameters: TR = 10 ms, TE = 3 ms, FA = 10 °, voxel size = 120 × 120 × 120 μm³ and NEX = 10 resulted in the best fitting for sample size, image quality, scanning time and artifacts. An isovolumetric voxel shape allowed for multiplanar reconstructions. Within the osteochondral unit articular cartilage, cartilaginous repair tissue and bone marrow could clearly be distinguished from the subchondral bone plate and subarticular spongiosa. Specific alterations of the osteochondral unit associated with cartilage repair such as persistent drill holes, subchondral bone cysts, sclerosis of the subchondral bone plate and of the subarticular spongiosa and intralesional osteophytes were precisely detected.

Conclusions

High resolution, non-destructive ex vivo analysis of the entire osteochondral unit in a preclinical large animal model that is sufficient for further analyses is possible using μMRI at 9.4 T. In particular, 9.4 T is capable of accurately depicting alterations of the subchondral bone that are associated with osteochondral repair.

【 授权许可】

   
2015 Goebel et al.; licensee BioMed Central.

【 图 表 】

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