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The effect of stress fracture occurring within the first 12 months of training on subsequent race performance in Thoroughbreds in Hong Kong.

在训练的前12个月内发生的应力性骨折对香港纯种马的后续比赛表现的影响。

  • 影响因子:0
  • DOI:10.1111/evj.13324
  • 作者列表:"Johnston AS","Sidhu ABS","Riggs CM","Verheyen KLP","Rosanowski SM
  • 发表时间:2021-05-01
Abstract

BACKGROUND:Racehorses are at an increased risk of stress fracture within the first 12 months of racing and when resuming training after a break. Research in these high-risk periods and on the effect of performance post-recovery is limited. OBJECTIVES:To describe the occurrence of stress fractures, diagnosed by nuclear scintigraphy (NS), in racehorses' first 12 months training in Hong Kong, and their impact on racing performance and career length. STUDY DESIGN:Retrospective 1:2 matched case-control study. METHODS:Clinical records of horses with NS-diagnosed stress fractures within 365 days of import between 2006 and 2018 were collated. Cases and controls were matched on import date. Univariable conditional logistic regression compared signallment, pre-fracture training and post-recovery racing performance between cases and matched controls. Shared Frailty Cox regression analysed time from import to fracture and total career length. RESULTS:Eighty-seven horses sustained a NS-diagnosed fracture within their first year in Hong Kong (incidence risk 1.7% [95% confidence interval (CI) 1.4%-2.1%; N = 5180]). The humerus (42.0%; 95% CI 31.8%-52.6%; n = 39) and tibia (28.0%; 95% CI 19.1%-38.2%; n = 26) were the most common stress fracture sites. Cases missed a median of 63 days (Interquartile range (IQR) 49-82) of training because of fracture. Within the 12 months following diagnosis, case horses had a median of four (IQR 2-4, P < .0001) fewer race starts and were down HK$ 206 188 (IQR HK$ 0-436 800, P = .007) in race earnings compared to controls. Career length did not significantly differ between cases and controls (median 2 years and 3 months; IQR 15.3-39.1 months; P = .2). MAIN LIMITATIONS:Only stress fractures diagnosed by NS were included, hence, the study is not representative of all stress fractures occurring in racehorses in Hong Kong. CONCLUSIONS:Racehorses sustaining a stress fracture within 1 year of entering Hong Kong lost significant time in training, earnings and race starts. However, overall career length was unaffected.

摘要

背景: 赛马在比赛的前12个月内以及休息后恢复训练时,应力性骨折的风险增加。在这些高风险时期以及对恢复后性能的影响的研究是有限的。 目的: 描述在香港赛马的前12个月训练中通过核素显像 (NS) 诊断的应力性骨折的发生,以及它们对赛车表现和职业长度的影响。 研究设计: 回顾性1:2配对病例对照研究。 方法: 整理2006年至365年间输入2018天内NS诊断为应力性骨折的马的临床记录。病例和对照在输入日期匹配。单变量条件logistic回归比较了病例和匹配对照之间的信号、骨折前训练和恢复后赛车表现。共享虚弱Cox回归分析了从输入到骨折的时间和总职业长度。 结果: 87匹马在香港第一年内经历了NS诊断的骨折 (发病率风险1.7% [95% 置信区间 (CI) 1.4%-2.1%; N = 5180])。肱骨 (42.0%; 95% CI 31.8%-52.6%; n = 39) 和胫骨 (28.0%; 95% CI 19.1%-38.2%; n = 26) 是最常见的应力性骨折部位。病例因骨折而错过了63天 (四分位距 (IQR) 49-82) 的训练中位数。在诊断后的12个月内,病例马的比赛起跑中位数为4 (IQR 2-4,P <.0001),与对照组相比,比赛收入下降了206港元188 (IQR 0-436港元800,P = .007)。病例和对照之间的职业长度没有显著差异 (中位2年和3个月; IQR 15.3-39.1个月; P = .2)。 主要限制: 仅包括NS诊断的应力性骨折,因此,该研究不能代表香港赛马中发生的所有应力性骨折。 结论: 赛马在进入香港后1年内发生应力性骨折,在训练、收入和比赛开始方面损失了大量时间。然而,总体职业长度不受影响。

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