Page 553 - Adams and Stashak's Lameness in Horses, 7th Edition

Lameness of the Distal Limb 519

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Figure 4.95. Sagittal (left) and dorsal (right) FLASH MRI images of the same horse in Figure 4.12. There is a subchondral cyst‐like lesion of
the distal aspect of P1 in the left hindlimb. Radiographically apparent lysis was not noted until after discovery of the cyst‐like lesion on MRI.

Figure 4.96. Preoperative (left) and postoperative radiographs (right) from a 4‐year‐old Warmblood mare treated with a transcortical
screw for a subchondral cyst‐like lesion in distal P1. This is the same horse shown in Figure 4.95.

of the collateral ligaments from external trauma and Subluxations of the PIP joint occur most commonly in
may be open or closed. Palmar/plantar luxation is usu- a dorsal direction. The terms dorsal and palmar/plantar
ally seen following a severe, traumatic soft tissue injury, refer to the subluxation of the proximal phalanx relative
such as complete tearing of the straight DSL, branches to the position of the middle phalanx. Dorsal subluxa-
of the SDFT, or a combination of these injuries, and usu- tions of the PIP joint are most common in young horses
ally only results in subluxation (Figure 4.97). Luxation and may be secondary to flexural deformities and other
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in the medial/lateral and palmar/plantar direction nearly developmental orthopedic diseases (Figure 4.98) as well
always involves a single limb. as secondary to severe suspensory ligament injury and