Gold Sarah J, Werpy Natasha M, Gutierrez-Nibeyro Santiago D
B.W. Furlong & Associates, Oldwick, NJ, 08858.
Equine Diagnostic Imaging, Archer, FL, 32618.
Vet Radiol Ultrasound. 2017 May;58(3):344-353. doi: 10.1111/vru.12488. Epub 2017 Mar 9.
Sagittal groove injuries of the proximal phalanx are an important cause of lameness in performance horses. The purpose of this retrospective case series study was to describe standing low-field magnetic resonance imaging (MRI) characteristics of these injuries in a group of Warmblood horses. Horses with an MRI diagnosis of sagittal groove injuries involving the proximal phalanx and that had follow-up MRI and clinical outcome information were included. Findings from clinical examinations, diagnostic tests, and other imaging modalities were recorded. All MRI studies were retrieved for re-evaluation by an experienced, board-certified veterinary radiologist. A total of 19 horses met inclusion criteria. All horses had MRI lesions consistent with unilateral or bilateral sagittal groove injuries of the proximal phalanx and abnormal mineralization of the sagittal ridge of the third metacarpal/metatarsal bone. Fifteen horses (79%) had concurrent osteoarthritis of the affected metacarpophalangeal/metatarsophalangeal joint. Eighteen horses received conservative therapy and all horses still had osseous abnormalities detected at the time of follow-up MRI. Thirteen horses (68.5%) were still lame at the time of follow-up, whereas the other six horses (31.5%) had become sound and returned to the previous level of exercise. Findings indicated that, for mature Warmblood horses, acute or chronic injuries of the sagittal groove of the proximal phalanx may have variable standing low-field MRI characteristics. Based on this sample of 19 horses, findings also indicated that the prognosis for performance soundness in horses diagnosed with sagittal groove injury of the proximal phalanx and concurrent osteoarthritis is poor.
近端指骨矢状沟损伤是运动马匹跛行的一个重要原因。本回顾性病例系列研究的目的是描述一组温血马中这些损伤的站立位低场磁共振成像（MRI）特征。纳入了经MRI诊断为涉及近端指骨矢状沟损伤且有后续MRI及临床结局信息的马匹。记录临床检查、诊断测试及其他成像方式的结果。所有MRI研究均由一位经验丰富、获得委员会认证的兽医放射科医生重新评估。共有19匹马符合纳入标准。所有马匹的MRI病变均与近端指骨单侧或双侧矢状沟损伤以及第三掌骨/跖骨矢状嵴矿化异常一致。15匹马（79%）患侧掌指关节/跖趾关节并发骨关节炎。18匹马接受了保守治疗，且在后续MRI检查时所有马匹仍存在骨质异常。13匹马（68.5%）在随访时仍跛行，而其他6匹马（31.5%）已恢复健康并恢复到之前的运动水平。研究结果表明，对于成年温血马，近端指骨矢状沟的急性或慢性损伤可能具有可变的站立位低场MRI特征。基于这19匹马的样本，研究结果还表明，被诊断为近端指骨矢状沟损伤并发骨关节炎的马匹运动健全的预后较差。
