High density infill in cracks and protrusions from the articular calcified cartilage in osteoarthritis in standardbred horse carpal bones.
Abstract: We studied changes in articular calcified cartilage (ACC) and subchondral bone (SCB) in the third carpal bones (C3) of Standardbred racehorses with naturally-occurring repetitive loading-induced osteoarthritis (OA). Two osteochondral cores were harvested from dorsal sites from each of 15 post-mortem C3 and classified as control or as showing early or advanced OA changes from visual inspection. We re-examined X-ray micro-computed tomography (µCT) image sets for the presence of high-density mineral infill (HDMI) in ACC cracks and possible high-density mineralized protrusions (HDMP) from the ACC mineralizing (tidemark) front (MF) into hyaline articular cartilage (HAC). We hypothesized and we show that 20-µm µCT resolution in 10-mm diameter samples is sufficient to detect HDMI and HDMP: these are lost upon tissue decalcification for routine paraffin wax histology owing to their predominant mineral content. The findings show that µCT is sufficient to discover HDMI and HDMP, which were seen in 2/10 controls, 6/9 early OA and 8/10 advanced OA cases. This is the first report of HDMI and HDMP in the equine carpus and in the Standardbred breed and the first to rely solely on µCT. HDMP are a candidate cause for mechanical tissue destruction in OA.
Publication Date: 2015-04-28 PubMed ID: 25927581PubMed Central: PMC4463607DOI: 10.3390/ijms16059600Google Scholar: Lookup
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- Journal Article
- Research Support
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Summary
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The study investigates the changes in articular calcified cartilage (ACC) and subchondral bone (SCB) in the third carpal bones (C3) of Standardbred racehorses suffering from osteoarthritis (OA). Using X-ray micro-computed tomography (µCT), researchers found that high-density mineral infill (HDMI) in ACC cracks and high-density mineralized protrusions (HDMP) were present in affected bones, potentially contributing to mechanical tissue destruction associated with OA.
Study Purpose and Methodology
- The research aimed to understand the changes in ACC and SCB in Standardbred racehorses suffering from naturally occurring, repetitive loading-induced OA. This was achieved by studying these horses’ C3 post-mortem.
- The team harvested two osteochondral cores from dorsal sites of each C3 from 15 horses. These cores were then classified into three groups: controls (healthy), early OA, or advanced OA based on visual inspection.
- Through the use of X-ray µCT imaging, the researchers studied the cores for HDMI in ACC cracks and possible HDMP from the ACC mineralizing front (MF) into hyaline articular cartilage (HAC).
Findings from X-Ray Micro-Computed Tomography (µCT)
- The researchers postulated that a resolution of 20-µm in 10-mm diameter samples could detect HDMI and HDMP. These specific features are typically lost in tissue decalcification for regular paraffin wax histology due to their high mineral content.
- Through µCT, the scientists were able to discover HDMI and HDMP in the studied samples.
- HDMI and HDMP were observed in certain controls (2 out of 10), early OA (6 out of 9), and advanced OA cases (8 out of 10).
- This is the first study of its kind, reporting these findings in Standardbred horses’ equine carpus and relying solely on µCT.
Significance of High-Density Mineralized Protrusions (HDMP)
- HDMP have been identified as potentially responsible for mechanical tissue damage in OA, an important finding as it could lead to future understanding and improvement in OA treatments, possibly even in other species.
Cite This Article
APA
Laverty S, Lacourt M, Gao C, Henderson JE, Boyde A.
(2015).
High density infill in cracks and protrusions from the articular calcified cartilage in osteoarthritis in standardbred horse carpal bones.
Int J Mol Sci, 16(5), 9600-9611.
https://doi.org/10.3390/ijms16059600 Publication
Researcher Affiliations
- Comparative Orthopaedic Research Laboratory, Département de Sciences Cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, C.P. 5000, Saint-Hyacinthe, QC J2S-7C6, Canada. sheila.laverty@umontreal.ca.
- Comparative Orthopaedic Research Laboratory, Département de Sciences Cliniques, Faculté de Médecine Vétérinaire, Université de Montréal, C.P. 5000, Saint-Hyacinthe, QC J2S-7C6, Canada. matlacourt@gmail.com.
- Division of Experimental Medicine, McGill University, Montreal, QC H3G-1A4, Canada. chan.gao@mail.mcgill.ca.
- Bone Engineering Labs, Research Institute-McGill University Health Centre, Montreal General Hospital C9-133, 1650 Cedar Ave, Montreal, QC H3G-1A4, Canada. Janet.henderson@mcgill.ca.
- Dental Physical Sciences, Oral Growth and Development, Dental Institute, Barts' and The London School of Medicine and Dentistry, Queen Mary University of London (QMUL), London E1 4NS, UK. a.boyde@qmul.ac.uk.
MeSH Terms
- Animals
- Calcinosis / complications
- Calcinosis / diagnostic imaging
- Calcinosis / pathology
- Carpal Bones / diagnostic imaging
- Carpal Bones / pathology
- Cartilage, Articular / diagnostic imaging
- Cartilage, Articular / pathology
- Horses
- Osteoarthritis / complications
- Osteoarthritis / diagnostic imaging
- Osteoarthritis / pathology
- Radiographic Image Interpretation, Computer-Assisted
- Stress, Mechanical
- X-Ray Microtomography
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Citations
This article has been cited 8 times.- Kurz B, Lange T, Voelker M, Hart ML, Rolauffs B. Articular Cartilage-From Basic Science Structural Imaging to Non-Invasive Clinical Quantitative Molecular Functional Information for AI Classification and Prediction.. Int J Mol Sci 2023 Oct 7;24(19).
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