Summary
Objectives: To describe the radiographic appearance of the dorsoproximal aspect of the sagittal
ridge of the third metacarpal/metatarsal bone in Warmblood horses.
Methods: The lateromedial radiographic projections of the metacarpo-/metatarsophalangeal joints
performed on horses as a part of stallion selection were used. The dorsal aspect of
the distal third metacarpal/metatarsal bone was divided in two areas. The appearance
of the bone surface in area I was classified as normal, irregular, notch, indentation
and lucency. For area II, the categories were normal, irregular, depression or lucency
and flattening of the sagittal ridge. Other abnormalities at the dorsal aspect were
also noted.
Results: In area I, 51.5% of the ridges appeared normal, 19.3% were irregular, 8.9% had a
notch, 8.1% had a lucency, and 12.2% had an indentation. In 1.2% of the horses a fragment
was present, and in 1.7% a fragment was suspected.
In area II, 90.6% of the metacarpo-/metatarsophalangeal joints were normal, 6.2% were
irregular, 2.9% showed a depression or lucency, and the sagittal ridge in 0.2% was
flattened. A fragment was present in 0.3%, and suspected in 0.4%.
Clinical significance: Morphological variation is present at the dorsal aspect of the metacarpo-/metatarsophalangeal
joint in young Warmblood stallions. These various aspects should be recognised and
described in horses presented for prepurchase examination. However, their clinical
relevance in the individual horse is unclear and needs further investigation.
Funding: Stijn Hauspie is a research fellow of the “Special Research Fund”, Ghent
University (Belgium).
Keywords
Equine - metacarpophalangeal joint - meta-tarsophalangeal joint - radiography - Warm-blood
stallion