Page 321 - Equine Clinical Medicine, Surgery and Reproduction, 2nd Edition

296 CHAPTER 1

VetBooks.ir 1.557 1.558

Figs. 1.557–1.559 (1.557) Transverse
ultrasonographic image of the palmar metacarpus,
using a high-frequency transducer (18 MHz), showing
the appearance of the normal flexor tendons. The
1.559 larger bundles in the SDFT produce a coarser pattern
SC
than in the DDFT. f = deep fascia (the paratenon is
indistinguishable from the fascia); sc = subcutaneous
connective tissue; cs = carpal sheath (distal recess);
ICL = inferior check ligament. (1.558) Longitudinal
SDFT
(sagittal) ultrasonographic image of the palmar
metacarpus (13 MHz). Normal fibre bundles in the
SDFT form a hyperechogenic, longitudinally arranged
ct striation. Fibres in the the other tendons (DDFT,
ICL and SL) are also aligned but with a coarser
DDFT
5 pattern. (1.559) High-frequency (18 MHz) detail of
the flexor tendons. The deep palmar fascia (between
arrowheads) is visible and forms a focal thickening (palmar retinaculum) in the proximal metacarpus (dotted
line). The paratenon is indistinguishable from the fascia. ct = loose connective tissue separating the digital
flexor tendons.

either in sagittal/parasagittal or in frontal planes, Acute/subacute injuries
the longitudinally arranged fibre bundles produce Typical lesions appear as discrete, well-defined
parallel, linear echoes throughout the section. hypo- (dark grey) to anechogenic (black) areas.
They are more closely packed in the flexor tendons These are most often located near the centre of
than in the SL. the tendon (Fig. 1.560), but they may occur at the