Long-term histopathological developments in knee-joint components in a rat model of osteoarthritis induced by monosodium iodoacetate.
Ikufumi Takahashi, Taro Matsuzaki, Masahiro Hoso
PMID 28533591WHAT IT FOUND
In rats with chemically induced knee osteoarthritis, cartilage staining decreased at 1 week, the line separating cartilage from calcified cartilage disappeared by 2 weeks, and joint capsule spaces narrowed by 8 weeks.
No therapy was tested in people.
Key findings
01Cartilage matrix staining decreased at 1 week, and by 8 weeks the cartilage matrix had disappeared with eburnation and joint deformity.
02The tidemark disappeared in 10 rats at 2 weeks, with vessels entering the calcified layer.
03Joint capsule inflammatory cell infiltration decreased after 4 weeks, but narrowing between collagen fiber bundles increased at 6 and 8 weeks.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study used rats with chemically induced knee osteoarthritis, and the authors note this model is artificial and can differ from naturally occurring osteoarthritis. The tissue changes were not quantified with a cartilage degeneration scale or measured capsule collagen spacing. A single blinded pathologist made the histological assessments.
Declared interests
The authors report no conflicts of interest. The work was supported by university and departmental funding sources.
The easy way to misread this
Do not read these rat knee tissue changes as evidence that a therapy can reverse osteoarthritis in people. No human patients or treatment were tested.