Racing prognosis after cumulative stress-induced injury of the distal portion of the third metacarpal and third metatarsal bones in Thoroughbred racehorses: 55 cases (2000–2009)

Travis M. Tull Rood and Riddle Equine Hospital, 2150 Georgetown Rd, Lexington, KY 40580.

Search for other papers by Travis M. Tull in
Current site
Google Scholar
PubMed
Close
 DVM, DACVS
and
Lawrence R. Bramlage Rood and Riddle Equine Hospital, 2150 Georgetown Rd, Lexington, KY 40580.

Search for other papers by Lawrence R. Bramlage in
Current site
Google Scholar
PubMed
Close
 DVM, MS, DACVS

Click on author name to view affiliation information

Abstract

Objective—To evaluate the diagnostic features, results of free-choice exercise treatment, prognosis, and postinjury racing performance of Thoroughbred racehorses with cumulative stress-induced bone injury (CSBI) of the distal portion of the third metacarpal and third metatarsal bones (MC3/MT3).

Design—Retrospective case series.

Animals—55 Thoroughbred racehorses with CSBI of the distal portion of MC3/MT3.

Procedures—Data on signalment, history, and radiographic, scintigraphic, and lameness examination findings were reviewed. Horses with lameness localized to the distal portion of MC3/MT3, and that did not have concurrent lameness but did have radiographic and nuclear scintigraphic changes consistent with CSBI, were included in the study. Information on pre-and postinjury racing performance was acquired from race records.

Results—Mean age was 3.2 years (median, 3 years [range, 2 to 6 years]). Ninety-five percent (52/55) of horses with CSBI raced after injury. Males were more commonly affected (75% [41/55]) than were females (25% [14/55]; odds ratio, 3.99 [95% confidence interval, 2.17 to 7.34]). There was no significant difference in postinjury total earnings, compared with total earnings before injury; horses had significantly more starts and less earnings per start after injury. Median time to first start after injury was 194 days. Of 45 horses that raced before and after injury, 31 % (14/45) had an increase in racing class, 31 % (14/45) had no change in class, and 38% (17/45) had a decrease in class.

Conclusions and Clinical Relevance—Thoroughbred racehorses with CSBI of the distal portion of MC3/MT3 treated with free-choice exercise had a favorable prognosis with no appreciable decrease in class or performance.

Abstract

Objective—To evaluate the diagnostic features, results of free-choice exercise treatment, prognosis, and postinjury racing performance of Thoroughbred racehorses with cumulative stress-induced bone injury (CSBI) of the distal portion of the third metacarpal and third metatarsal bones (MC3/MT3).

Design—Retrospective case series.

Animals—55 Thoroughbred racehorses with CSBI of the distal portion of MC3/MT3.

Procedures—Data on signalment, history, and radiographic, scintigraphic, and lameness examination findings were reviewed. Horses with lameness localized to the distal portion of MC3/MT3, and that did not have concurrent lameness but did have radiographic and nuclear scintigraphic changes consistent with CSBI, were included in the study. Information on pre-and postinjury racing performance was acquired from race records.

Results—Mean age was 3.2 years (median, 3 years [range, 2 to 6 years]). Ninety-five percent (52/55) of horses with CSBI raced after injury. Males were more commonly affected (75% [41/55]) than were females (25% [14/55]; odds ratio, 3.99 [95% confidence interval, 2.17 to 7.34]). There was no significant difference in postinjury total earnings, compared with total earnings before injury; horses had significantly more starts and less earnings per start after injury. Median time to first start after injury was 194 days. Of 45 horses that raced before and after injury, 31 % (14/45) had an increase in racing class, 31 % (14/45) had no change in class, and 38% (17/45) had a decrease in class.

Conclusions and Clinical Relevance—Thoroughbred racehorses with CSBI of the distal portion of MC3/MT3 treated with free-choice exercise had a favorable prognosis with no appreciable decrease in class or performance.

All Time Past Year Past 30 Days
Abstract Views 129 0 0
Full Text Views 993 839 188
PDF Downloads 346 150 18
Advertisement