de Zani D, Polidori C, di Giancamillo M, Zani D D
Reparto di Radiologia, Azienda Polo Veterinario di Lodi, Università degli Studi di Milano, Lodi, Italy.
Private Practitioner, Torino, Italy.
Equine Vet J. 2016 Mar;48(2):165-71. doi: 10.1111/evj.12411. Epub 2015 Mar 4.
There are few studies on the correlations between radiographic measurements of the foot and abnormalities of specific structures found with magnetic resonance imaging (MRI).
To document the relationship between radiographic measurements of the equine foot and the presence of lesions in the foot on MRI. We hypothesised that different radiographic measurements would be associated with specific lesions detected by MRI.
Retrospective analysis of radiographs and MRI studies.
Seventy-four feet from 52 lame horses were included. Twenty parameters were measured on radiographs, whereas the signal intensity, homogeneity and size of each structure in the foot were evaluated on magnetic resonance images. The data were analysed using simple linear correlation analysis and classification and regression trees (CARTs).
Linear correlations were found between the navicular bone compacta thickness and injuries of the deep digital flexor tendon, collateral sesamoidean ligament, navicular spongiosa and navicular bone proximal border. Long-toed horses had a high incidence of lesions involving the spongiosa and proximal border of the navicular bone. Elongation of the navicular bone was associated with proximal and distal border injuries. A reduced palmar angle and increased angle between the middle and distal phalanx were observed in horses with alterations of collateral ligaments of the distal interphalangeal joint and navicular bone spongiosa, respectively. For each structure under investigation, CARTs predicting the presence of MRI pathology based on radiographic measurements had excellent performance, with >80% correct classification of cases, when using one of 3 data sources.
This study demonstrated a relationship between radiographic measurements of the foot and the presence of lesions detected on MRI, while CARTs illustrated that different radiographic measurements were associated with different MRI lesions.
关于足部X线测量值与磁共振成像（MRI）发现的特定结构异常之间的相关性研究较少。
记录马足部的X线测量值与MRI显示的足部病变之间的关系。我们假设不同的X线测量值与MRI检测到的特定病变相关。
对X线片和MRI研究进行回顾性分析。
纳入来自52匹跛马的74只蹄。在X线片上测量20个参数，而在磁共振图像上评估蹄内各结构的信号强度、均匀性和大小。使用简单线性相关分析以及分类与回归树（CART）对数据进行分析。
发现舟骨密质骨厚度与指深屈肌腱、籽骨侧副韧带、舟骨松质骨和舟骨近端边缘损伤之间存在线性相关性。长趾马中，舟骨松质骨和近端边缘病变的发生率较高。舟骨延长与近端和远端边缘损伤相关。分别在远侧指间关节侧副韧带和舟骨松质骨发生改变的马匹中，观察到掌侧角减小和中节与远节趾骨之间的角度增大。对于每个研究结构，基于X线测量值预测MRI病变存在情况的CART在使用3个数据源之一时表现出色，病例正确分类率>80%。
本研究证明了足部X线测量值与MRI检测到的病变之间的关系，而CART表明不同的X线测量值与不同的MRI病变相关。
