Objective—To evaluate effects of sex, fracture
configuration, affected limb, and screw placement
on outcome of Thoroughbreds with condylar fractures
involving the third metacarpal or metatarsal
Procedure—Age, sex, affected limb, fracture configuration,
fracture length, fracture fragment width, and
distance of the most distal screw from the articular
surface were analyzed in logistic regression models.
Results—Females were more likely to have displaced
fractures and race in fewer races after surgery than
males. Sex and fracture configuration were associated
with number of postoperative races. Among horses
that returned to racing, those with thicker fracture
fragments were 11 times as likely as horses with thinner
fracture fragments to win a race after surgery.
Horses with longer fractures and older horses had
fewer postoperative races. Horses in which the most
distal screw had been placed further from the joint
surface had more races.
Conclusion and Clinical Relevance—Results suggest
that female horses with displaced condylar fractures
and male horses with nondisplaced condylar
fractures are more likely to be referred for treatment.
The effect of sex on outcome for these horses cannot
be clearly separated from the effect of fracture configuration.
When adjusted for fracture configuration,
males were 6 times as likely as females to race after
surgery. When adjusted for sex, horses with nondisplaced
fractures were 17 times as likely as horses
with displaced fractures to race after surgery. Results
suggest that the most distal screw should be placed
above the epicondylar fossa. (J Am Vet Med Assoc
Objective—To compare racing performance before
and after prosthetic laryngoplasty for treatment of
laryngeal neuropathy in inexperienced and experienced
Animals—52 Thoroughbred racehorses treated with
prosthetic laryngoplasty for laryngeal neuropathy.
Procedure—Lifetime race records were analyzed by
use of a verified regression model. Individual race
records and hospital records were also reviewed.
Results—Experienced horses had a decline in performance,
as measured by performance index, earnings
percentage, and mean prediction error, during the 6-month period before prosthetic laryngoplasty.
Performance improved after surgery, relative to performance
in 1 to 4 races immediately before surgery,
but did not attain previous baseline values for performance
index and earnings percentage, although racing
speed was restored to baseline values. Factors
associated with failure to attain baseline levels of performance
included other racing-related injuries and
disorders, major complications of surgery, and age.
Individually, however, many horses had long and successful
careers after surgery. Performance of inexperienced
horses after surgery was at least equal to that
of experienced horses.
Conclusions and Clinical Relevance—In addition to
warning clients of the complications associated with
prosthetic laryngoplasty, it may be prudent to provide
a guarded prognosis for full restoration of racing performance
in older horses, unless they are especially
talented and are free of other racing-related problems.
(J Am Vet Med Assoc 2000;217:1689–1696)