In situ and ex vivo evaluation of an arthroscopic indentation instrument to estimate the health status of articular cartilage in the equine metacarpophalangeal joint.
Authors: Brommer Harold, Laasanen Mikko S, Brama Pieter A J, van Weeren P René, Helminen Heikki J, Jurvelin Jukka S
Journal: Veterinary surgery : VS
Summary
# Editorial Summary Researchers evaluated the Artscan 200, an arthroscopic indentation device, to determine whether it could reliably assess cartilage health in equine metacarpophalangeal joints by measuring stiffness changes and degenerative markers. Using proximal phalangeal cartilage specimens from 39 horses (aged 1.5–22 years), they tested the instrument's reproducibility, accuracy, and ability to correlate mechanical properties with surface integrity, measuring dynamic modulus values (range 0.9–8.1 MPa) and a cartilage degeneration index (CDI) at joint margin and joint centre sites. The device demonstrated acceptable reproducibility with a coefficient of variation of 9.0%, but importantly, it only detected significant changes in indenter force when cartilage stiffness had declined substantially (dynamic modulus <2.5 MPa) or when CDI values at the joint margin exceeded 50%—meaning early degenerative changes were missed. This finding significantly limits the clinical utility of arthroscopic indentation assessment during diagnostic surgery, as most early-stage osteoarthritis pathology would escape detection; however, the technique may have diagnostic value in advanced cartilage degeneration where mechanical properties are substantially compromised. For practitioners, this underscores the importance of complementary diagnostic approaches—such as visual assessment, probing, and imaging—during arthroscopy, as mechanical indentation alone cannot reliably identify the initial cartilage changes that represent critical windows for preventative intervention.
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Practical Takeaways
- •The Artscan 200 cannot reliably detect early cartilage damage during arthroscopy—early OA lesions may be missed with this technique alone
- •This tool may be most useful as a confirmatory test in horses with visibly advanced cartilage damage rather than for screening purposes
- •Surgeons should not rely solely on this indentation technique to assess cartilage health; visual inspection and other diagnostic methods remain essential during arthroscopic examination
Key Findings
- •Artscan 200 indentation instrument showed adequate reproducibility (CV 9.0%) for measuring cartilage properties in equine joints
- •Device could only reliably detect cartilage degeneration when dynamic modulus decreased below 2.5 MPa, indicating advanced cartilage damage
- •Cartilage degeneration index >50% at joint margin correlated with significant mechanical property changes
- •Instrument has limited utility for detecting early-stage osteoarthritic changes but may be useful in advanced OA assessment