MRI

Authors: Santiago D. Gutierrez-Nibeyro , Nathaniel A. White II , Natasha M. Werpy , Laurie Tyrrell , Kent A. Allen , Kenneth E. Sullins , Richard D. Mitchell
Journal: Veterinary Radiology and Ultrasound

We report the use of a low-field magnetic resonance (MR) imaging system for the detection of desmopathy of the collateral ligament of the distal interphalangeal joint and the long-term outcome. Twenty horses were studied and their medical records and MR images were reviewed retrospectively. Long-term follow-up information was obtained by telephonic questionnaires of owners, trainers, or referring veterinarians. Desmopathy of the medial collateral ligament (80%) and enthesopathy of the affected collateral ligament (80%) were common MR imaging features.

Category: Equine - Imaging - Ligament - MRI
Authors: CERI E. SHERLOCK , TIMOTHY S. MAIR , FRERIK TER BRAAKE
Journal: Veterinary Radiology and Ultrasound

We report the use of low-field standing magnetic resonance imaging in the standing horse for the diagnosis of osseous lesions in the metacarpophalangeal (MCP) or metatarsophalangeal (MTP) joint that were not apparent using standard radiography. Thirteen horses were studied and all had thickening of the subchondral bone plate and abnormal signal intensity in the adjacent spongiosa in either the condyles of metacarpal/metatarsal III or the proximal phalanx or both.

Category: Bone - Equine - Imaging - MRI
Authors: Jason B. Arble , John S. Mattoon , Wm. Tod Drost , Steven E. Weisbrode , Peter A. Wassenaar , Xueliang Pan , Robert J. Hunt , James K. Belknap
Journal: Veterinary Radiology and Ultrasound

ABSTRACT

Category: Equine - Imaging - Laminitis - MRI
Authors: Blunden, A.; Murray, R.; Dyson, S.
Journal: Equine Veterinary Journal

Reasons for performing study: Lameness associated with lesions of the deep digital flexor tendon (DDFT) in the digit is now recognised as an important cause of lameness, but there is currently limited information about the pathological nature of the lesions.

Objectives: To compare: signal intensity changes on magnetic resonance images with histopathology; and histopathological changes in the DDFT from horses with no history of foot-related lameness (Group C) and horses with lesions of the DDFT confirmed using magnetic resonance imaging (MRI) (Group D).

Authors: Sherlock, C.; Mair, T.; Blunden, T.
Journal: Equine Veterinary Journal

Reasons for performing study: Erosion of the palmar (flexor) aspect of the navicular bone is difficult to diagnose with conventional imaging techniques.

Objectives: To review the clinical, magnetic resonance (MR) and pathological features of deep erosions of the palmar aspect of the navicular bone.

Methods: Cases of deep erosions of the palmar aspect of the navicular bone, diagnosed by standing low field MR imaging, were selected. Clinical details, results of diagnostic procedures, MR features and pathological findings were reviewed.

Category: Equine - Imaging - Lameness - MRI
Authors: SARAH SMITH, SUE J. DYSON, RACHEL C. MURRAY
Journal: Veterinary Radiology and Ultrasound

Distal sesamoidean ligament injury is a recognized cause of lameness but diagnosis using ultrasonography is sometimes difficult. Herein, we describe the normal appearance of the distal sesamoidean ligaments on magnetic resonance (MR) images and the changes that occur when the ligaments are injured. The appearance of the distal sesamoidean ligaments on MR images from 66 control horses and 58 horses with distal sesamoidean desmitis were described and the cross-sectional area and signal intensity of the ligaments measured.

Category: Equine - Imaging - Ligament - MRI
Authors: MEREDITH A. SMITH, SUE J. DYSON , RACHEL C. MURRAY
Journal: Veterinary Radiology and Ultrasound

Collagen fibers oriented at 55° to the static magnetic field (B0) are characterized by an artifactual increase in signal intensity due to the magic angle effect. We hypothesized that there would be increased signal intensity in the collateral ligaments of the distal interphalangeal joint and oblique sesamoidean ligaments when these ligaments were at angles approaching 55° to a horizontal B0 during standing magnetic resonance (MR) imaging. MR imaging was performed on four cadaver forelimbs in a 0.27 T standing system.

Category: Equine - Imaging - Ligament - MRI
Authors: Dyson, S.; Blunden, T.; Murray, R.
Journal: Equine Veterinary Journal

Reasons for performing study: Magnetic resonance imaging (MRI) is used with increasing frequency to diagnose injuries of the collateral ligaments (CLs) of the distal interphalangeal (DIP) joint, but the results have not been verified by histology and the mechanism of injury is poorly understood. Hypothesis: Abnormal signal intensity and tissue contour represents change in tissue structure detected on histology. Objectives: To compare results in horses free from and those with chronic lameness and to describe possible progression of lesions.

Authors: JENNIFER M. COHEN VMD, ROBERT K. SCHNEIDER DVM, MS, Diplomate ACVS, CHAD J. ZUBROD DVM, MS, Diplomate ACVS, SARAH N. SAMPSON DVM
Journal: Veterinary surgery

Objective—(1) To describe the clinical signs and abnormalities observed on magnetic resonance imaging (MRI) in 7 horses with desmitis of the distal digital annular ligament (DDAL); (2) to describe the normal magnetic resonance (MR) appearance and thickness of the DDAL in health; and (3) to describe a tenoscopic surgical technique for treating horses with desmitis of the DDAL. Study Design—Retrospective study. Animals—Horses (n=7) with desmitis of the DDAL. Methods—MR examinations of 20 sound horses were reviewed to determine the normal appearance of the DDAL.

Category: Equine - Imaging - Ligament - MRI