Will my foal perform as intended? An analysis of long term prognosis for non-traumatic arthritis in foals
2020
Introduction: Interpretation of transverse hypoechoic
lines seen during ultrasonography of medial menisci is
challenging as their cause is not fully understood. The
aim of this study was to characterize the normal acoustic
anatomy of the medial equine meniscus.
Materials and Methods: Ten non-lame adult
warmblood horses without anamnestic, clinical, radiographic
and ultrasonographic signs of lameness associated
to the stifle were euthanized for reasons unrelated to
the current study. Prior to death medial femorotibial joints were examined with ultrasound in a coronal plane
where the medial collateral ligament adheres to the
meniscus. Post mortem photographs of corresponding
coronal meniscal sections were made. Hypoechoic areas
were labelled on digital ultrasound images and laid over
corresponding coronal images of menisci specimen. Correlation
of hypoechoic regions with structural elements
of the menisci was evaluated.
Results: On most ultrasound images 2-3 larger, wedge
or club-shaped hypoechoic regions were detected distally
in the meniscus, increasing in width from medial to lateral.
Their medial, narrow origin mostly correlated to
prominent T-shaped junctions between the fibrous
meniscal capsule and radially orientated tie-fibers formed
by loose connective tissue. More laterally anechoic areas
became wider than the tie-fibers and did not correlate to
their shape.
Discussion/Conclusion: Direct comparisons between
normal anatomic structures of equine menisci and
corresponding ultrasound images have not been made to
date. Anechoic linear areas in normal menisci interpreted
as artifacts are potentially caused by refraction of ultrasound
at the interface between meniscal capsule and
radially orientated tie-fibers. Histology is essential to further
characterize causative structures.
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