Plevin S, McLellan J
Florida Equine Veterinary Associates, Ocala, Florida, USA.
Equine Vet J. 2014 Sep;46(5):560-6. doi: 10.1111/evj.12197. Epub 2013 Dec 23.
The occurrence of bucked shins in young Thoroughbred racehorses in North America is high. Although an altered training regime has demonstrated a significant decrease in this condition, trainers can be opposed to altering something as fundamental as their training routine. Periosteal scraping of the third metacarpal bone (McIII) is a putative prophylactic technique used to prevent bucked shins; therefore, a study to investigate the validity of the procedure is warranted.
To investigate whether prophylactic McIII scraping: 1) reduces the incidence of bucked shins in juvenile Thoroughbred horses at race speeds (breeze); and 2) allows increased cumulative breeze miles before the onset of disease.
Nonrandomised prospective clinical study.
One hundred and seventy yearling Thoroughbreds from one farm, under one trainer, were enrolled in this study over one training season; 85 horses were treated and 85 horses were control animals. Horses were observed for bucked shins over 5 cumulative breeze miles. The objectives were evaluated by comparing incidence rates and Kaplan-Meier plots.
The incidence rate for bucked shins was 0.059 cases per breezed mile in the treatment group, compared with 0.103 cases per breezed mile in the control group. Comparison of Kaplan-Meier plots of breeze miles for the 2 groups demonstrated a significant difference between groups (P = 0.035). Horses that developed bucked shins following periosteal shin scraping breezed an average of 3.52 miles before the onset of disease, compared to 2.50 miles for horses not prophylactically treated (P = 0.005).
Periosteal McIII scraping reduced the incidence rate of bucked shins. The procedure allowed treated horses to breeze greater cumulative distances before an incident but failed to prevent the disease over the long term. Further investigation into this commonly used prophylactic technique is required.
北美年轻纯种赛马中胫骨外凸的发生率很高。尽管改变训练方案已证明这种情况显著减少，但训练师可能反对改变像他们的训练常规这样基本的事情。第三掌骨（McIII）骨膜刮除术是一种用于预防胫骨外凸的假定预防技术；因此，有必要开展一项研究来调查该手术的有效性。
调查预防性McIII骨膜刮除术是否：1）降低幼年纯种赛马在比赛速度（轻跑）下胫骨外凸的发生率；2）在疾病发作前允许增加累积轻跑里程数。
非随机前瞻性临床研究。
在一个训练季节里，从一个马场选取170匹一岁纯种马，由一位训练师训练，其中85匹马接受治疗，85匹马作为对照动物。观察马匹在累积5英里轻跑过程中是否出现胫骨外凸。通过比较发病率和Kaplan-Meier曲线来评估研究目的。
治疗组胫骨外凸的发病率为每轻跑英里0.059例，而对照组为每轻跑英里0.103例。两组轻跑里程的Kaplan-Meier曲线比较显示两组之间存在显著差异（P = 0.035）。骨膜胫骨刮除术后出现胫骨外凸的马匹在疾病发作前平均轻跑3.52英里，而未接受预防性治疗的马匹为2.50英里（P = 0.005）。
McIII骨膜刮除术降低了胫骨外凸的发病率。该手术使接受治疗的马匹在发病前能够轻跑更长的累积距离，但未能长期预防该疾病。需要对这种常用的预防技术进行进一步研究。
