Page 354 - Equine Clinical Medicine, Surgery and Reproduction, 2nd Edition

Musculoskeletal system: 1.8 Soft-tissue injuries 329

VetBooks.ir the fetlock may drop. There is often pain on fetlock PSB is uncommon but can be encountered. A small
mineralised fragment is usually displaced proximally
flexion and reduced amplitude of fetlock motion.
Radiography for 0.5 to 2 cm.
Radiography may be useful to detect distal enthe- Ultrasonography
seopathy at the insertion of the SL branches on the The lesions have a similar appearance to those in the
PSB (‘sesamoiditis’) or distal splint bone fractures. SDFT, with increased branch size (Fig. 1.638) and
Avulsion of the distal insertion of the branch on the well-defined (Fig. 1.639) or diffuse (Fig. 1.640, 1.641)

1.638 1.639

Fig. 1.638 Increased cross-sectional area of the Fig. 1.639 Well-defined, hypoechogenic lesion
medial SL branch as compared with the lateral (red arrows) within the medial branch of the SL due
branch. This is an acute on chronic injury (note the to an acute tear. Note the presence of a more diffusely
heterogeneous lateral branch). hypoechogenic area, suggesting an ongoing, chronic
injury (yellow arrow).

1.640 1.641

Fig. 1.640, 1.641 Severe, acute desmopathy of the medial branch of the SL. The lesion is very diffuse with
a coarsely heterogeneous appearance on the transverse view (1.640, obtained from a medial approach) and
amorphous loss of fibre organisation throughout the thickness of the branch on the longitudinal (frontal) view
(1.641). The ligament is severely enlarged (yellow arrows). Note the marked thickening of the paratenon and
periligamentous tissues (red arrows).