Authors: Friederike Pohlin, DVM; Johannes Edinger, DVM; Florien Jenner, DVM, PhD; Monika Egerbacher, DVM, PhD
Journal: American Journal of Veterinary Research

Objective—To describe the anatomic and histologic features of the collateral ligaments (CLs) of the metacarpophalangeal (MCP) and metatarsophalangeal (MTP) joints in cadaveric limbs obtained from nonlame horses and to compare the histologic findings with the ultrasonographic appearance of the CLs.

Sample—Medial and lateral CLs of the MCP and MTP joints of 28 limbs (16 forelimbs and 12 hind limbs) from 9 adult nonlame horses euthanized for reasons unrelated to the study.

Authors: Celine A. Bourzac, DVM, MS; Judith B. Koenig, DVM, DVSc; Kaitlyn A. Link; Stephanie G. Nykamp, DVM; Thomas G. Koch, DVM, PhD
Journal: American Journal of Veterinary Research

Objective—To evaluate the efficacy and effects of labeling equine umbilical cord blood (UCB)– and bone marrow (BM)–derived multipotent mesenchymal stromal cells (MSCs) with an ultrasmall superparamagnetic iron oxide (SPIO) contrast agent and the detection of labeled MSCs by use of MRI.

Sample—UCB MSCs from placental tissues of 5 foals and BM MSCs from 5 horses.

Category: Equine - MRI - Stem cells - Tendon
Authors: Erin G. Porter, Natasha M. Werpy
Journal: Veterinary Clinics of North America: Equine Practice

This article addresses the clinical application of magnetic resonance imaging (MRI) and computed tomography (CT) as applied to the standing equine patient. This discussion includes the logistics, advantages, disadvantages, and limitations of imaging a standing horse. In addition, a brief review is given of the physics of these modalities as applied in clinical practice, and the currently available hardware and software required by these techniques for image acquisition and artifact reduction.

Category: CT - Equine - Imaging - MRI
Authors: Megan M. Lamb, Jennifer G. Barrett, Nathaniel A. White II and Stephen R. Werre
Journal: Veterinary Radiology and Ultrasound

Desmopathy of the distal interphalangeal joint collateral ligament is a common cause of lameness in the horse and carries a variable prognosis for soundness. Intralesional treatment has been proposed for improving outcome; however, limited reports describe methods for injecting this ligament. The purpose of this study was to compare accuracy of low-field magnetic resonance imaging (MRI) vs. radiography for injecting the collateral ligament of the distal interphalangeal joint.

Authors: Weston Davis, Christopher J Caniglia, Meghann Lustgarten, Travis Blackwelder, Ian Robertson and W Rich Redding
Journal: Veterinary Radiology and Ultrasound

Lateral digital flexor tendonitis is a rarely reported cause of hind limb lameness in performance horses. The purpose of this retrospective study was to describe clinical and diagnostic imaging findings for a group of horses with lateral digital flexor tendinitis within the tarsal sheath. Equine cases with a diagnosis of lateral digital flexor tendonitis and magnetic resonance imaging (MRI) studies of the affected region were retrieved from North Carolina University's medical record database.

Category: Equine - MRI - Tendon
Authors: Fanny Hontoir, Jean-François Nisolle, Hubert Meurisse, Vincent Simon, Max Tallier, Renaud Vanderstricht, Nadine Antoine, Joëlle Piret, Peter Clegg, Jean-Michel Vandeweerd
Journal: The Veterinary Journal

Articular cartilage defects are prevalent in metacarpo/metatarsophalangeal (MCP/MTP) joints of horses. The aim of this study was to determine and compare the sensitivity and specificity of 3-Tesla magnetic resonance imaging (3-T MRI) and computed tomography arthrography (CTA) to identify structural cartilage defects in the equine MCP/MTP joint.

Authors: Elizabeth H. Yorke, Carter E. Judy, Travis C. Saveraid, Conor P. McGowan and Fred J. Caldwell
Journal: Veterinary Radiology and Ultrasound

Distal border fragments of the navicular bone are increasingly being detected due to the improved capabilities of magnetic resonance imaging (MRI), but their clinical significance remains unclear. The purpose of this retrospective study was to describe the location, size, and frequency of fragments in a cohort of horses presented for MRI of the foot and to compare MRI findings with severity of lameness. Archived MRI studies and medical records were searched from March 2006 to June 2008. Horses were included if a distal border fragment of the navicular bone was visible in MRI scans.

Category: Bone - Equine - Lameness - MRI
Authors: E. B. Garcia, N. Rademacher, C. T. McCauley and L. Gaschen
Journal: Equine Veterinary Education

A 7-year-old Quarter Horse gelding was referred for magnetic resonance (MR) imaging due to chronic left hindlimb lameness localised to the foot. On presentation, a previously undiagnosed draining tract was identified at the plantar aspect of the pastern. Radiographs revealed severe osteolysis of the navicular bone. Positive contrast MR fistulography was performed using a gadolinium based contrast agent following conventional MR imaging of the left hind foot.

Category: Bone - Equine - Imaging - MRI
Authors: D. M. Bolt, R. M. Read, R. Weller, C. Sinclair, F. H. David
Journal: Equine Veterinary Education

This report describes the use of low-field standing magnetic resonance imaging (MRI) in the diagnosis and clinical decision making process in a 14-year-old Dutch Warmblood mare with a comminuted central tarsal bone fracture. Magnetic resonance imaging in the standing horse was preferred over computed tomography examination under general anaesthesia because the animal had sustained the injury during a poor recovery from a previous general anaesthetic episode.

Category: Bone - Equine - MRI - Traumatology
Authors: N.M. Werpy, J.M. Denoix, C.W. McIlwraith and D.D. Frisbie
Journal: Veterinary Radiology & Ultrasound

Previous studies have proposed that standard ultrasonography may not adequately represent the pertinent anatomic characteristics of the equine proximal suspensory ligament. The purpose of the study was to compare the use of standard ultrasonography, angle contrast ultrasonography, MRI, and histology for identification of the anatomic characteristics of the normal equine suspensory ligament in the forelimb. Horses free from forelimb lameness with no palpable abnormalities in the region of the suspensory ligament were included in the study.