Dyson Sue, Blunden Anthony, Murray Rachel
Centre for Equine Studies, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk, CB8 7UU, UK.
Centre for Preventative Medicine, Animal Health Trust, Lanwades Park, Kentford, Newmarket, Suffolk, CB8 7UU, UK.
Vet Radiol Ultrasound. 2017 Mar;58(2):216-227. doi: 10.1111/vru.12444. Epub 2016 Nov 13.
Injuries of the plantar soft tissues of the tarsus and proximal metatarsus can be a source of lameness in horses, however published information is lacking on high field MRI characteristics of these tissues. Objectives of the current anatomic study were to (1) describe high-field MRI features of the plantar tarsal and proximal metatarsal soft tissues; and (2) compare MRI findings with gross and histological appearances of selected structures for a sample of cadaver limbs from non-lame horses. Single hindlimbs for 42 horses, and right and left hindlimbs for eight horses were scanned using high-field MRI. The MRI findings were described for the 50 single limbs; and the MRI, gross postmortem and histological findings were compared for the eight pairs of hindlimbs. The superficial digital flexor tendon had uniform low signal intensity, surrounded by the flexor retinaculum of intermediate to high signal intensity on all sequences. The lateral digital flexor tendon had slightly higher signal intensity, enclosed on the plantaromedial aspects by the low signal intensity metatarsocalcaneal ligament. The accessory ligament of the deep digital flexor tendon varied in size and signal intensity. The proximal and distal plantar ligaments, accessory ligament of the suspensory ligament, and calcaneoquartal ligament had low signal intensity. The long plantar ligament comprised a number of related parts, separated by lines of high signal intensity corresponding with fibrous septae seen in gross anatomical specimens. The plantar aspect of the ligament had uniform low signal intensity in all sequences, but the dorsal half was more heterogeneous with multifocal spots or lines of higher signal intensity.
跗骨和近节跖骨足底软组织损伤可能是马匹跛行的一个原因，然而关于这些组织的高场磁共振成像（MRI）特征的公开信息却很缺乏。本解剖学研究的目的是：（1）描述跗骨和近节跖骨足底软组织的高场MRI特征；（2）将MRI结果与来自非跛行马尸体肢体样本中选定结构的大体和组织学外观进行比较。对42匹马的单后肢以及8匹马的左右后肢进行了高场MRI扫描。描述了50个单肢的MRI结果；并对8对后肢的MRI、大体尸检和组织学结果进行了比较。浅屈肌腱信号强度均匀较低，在所有序列中被中等至高信号强度的屈肌支持带所包围。外侧屈肌腱信号强度略高，在足底内侧被低信号强度的跖跟韧带所包绕。指深屈肌腱副韧带大小和信号强度各异。跖侧近端和远端韧带、悬韧带副韧带以及跟骰韧带信号强度较低。跖长韧带由多个相关部分组成，被与大体解剖标本中所见纤维间隔相对应的高信号强度线分隔。韧带的足底方面在所有序列中信号强度均匀较低，但背侧半部更为不均质，有多个高信号强度的斑点或线。
