Page 218 - Canine Lameness

190 13 Carpal Region

and ulna growth plate may be irregular or appear to be doubled (i.e. “double physis” sign as a result
of impaired ossification of the metaphyseal region) and periosteal bone formation may be visible
depending on the disease stages (Demko and Mclaughlin 2005).

13.7.4 Shearing Injuries
Shearing injuries routinely affect the carpal region (Benson and Boudrieau 2002) and often include
a loss of tendon and collateral ligaments. The orthopedic examination of carpal region with

CARPAL REGION (A) (C) (E) (G) (I)

(B) (D) (F) (H)

Figure 13.13 Other miscellaneous conditions of the carpal region. Images (A–D) depict distal radius
osteosarcoma: (A) swelling associated with distal radius osteosarcoma; (B) craniocaudal radiograph of a dog
showing predominantly osteolytic changes consistent with osteosarcoma; (C, D) radiographs of a dog
showing typical osteolytic-osteoproliferative changes consistent with osteosarcoma. Images (E, F) depict
radiographs of a dog with retained cartilaginous core of the ulna. Images (G–I) depict incomplete
ossification of the radial carpal bone: (G) the lateral radiograph shows a very faint line (white arrow), note
that the (black arrow) frequently identified line at the joint surface is normal and results from
superimposition of the ulnar carpal bone over the radial carpal bone; (H) the craniocaudal view shows a
lucent line that is suggestive of incomplete ossification; and (I) the craniocaudal view confirms the
diagnosis (white arrow indicates the fissure line across the radial carpal bone).