Page 159 - Equine Clinical Medicine, Surgery and Reproduction, 2nd Edition

134 CHAPTER 1

VetBooks.ir 1.236 1.237

Figs. 1.236, 1.237
MR image (1.236) and
dorsopalmar radiograph
(1.237) of the fetlock
region revealing an
intersesamoidean ligament
avulsion and associated
axial proximal sesamoid
bone bony changes.

1.238 fracture following removal is good. Biaxial PSB
fractures leading to severe breakdown injury have a
poor prognosis.

SESAMOIDITIS

Definition/overview
Sesamoiditis is a common finding in young race-
horses and relates to inflammation of the soft tissues
around the palmar aspect of the fetlock and associ-
ated bony changes in the PSBs.

Aetiology/pathophysiology
Repeated stresses on the palmar aspect of the
fetlock and PSBs can lead to tearing of the soft-
tissue attachments. A cycle of incomplete healing
and further damage can result in an entheseopathy
and bony modelling of the sesamoid bones. This
condition has been associated with suspensory
ligament injury. Alternatively, an acute single
Fig. 1.238 A biaxial proximal sesamoid bone overload injury may result in acute inflammation
fracture and suspensory apparatus breakdown in a of this region.
Thoroughbred racehorse.