Authors: M. Trump, P. R. Kircher, A. Fürst
Journal: Veterinary and Comparative Orthopaedics and Traumatology

Two fillies with hindlimb lameness and a tentative diagnosis of a pelvic fracture involving the acetabulum were examined using computed tomography (CT). The use of CT for these two cases revealed the exact course of the fractures and fissures, as well as the size and position of fragments, thus allowing for definitive diagnosis.

Category: CT - Equine - Imaging - Traumatology
Journal: Veterinary Radiology and Ultrasound

The effect of the chemical shift artifact, resulting from misregistration or phase cancellation at the interface between compact and trabecular bone, on apparent bone thickness was quantified in six isolated equine limbs. Sagittal T1-weighted spin echo (SE) and in-phase three-dimensional spoiled gradient echo (SPGR) images were acquired twice with a 1.5 T magnetic resonance (MR) unit, switching the frequency encoding direction between acquisitions. Out-of-phase SPGR images were also obtained.

Category: Bone - Equine - Imaging - MRI
Journal: Veterinary Radiology and Ultrasound

Lameness originating from the metacarpo(tarso)phalangeal (MP) joint has a significant effect on the use and athletic competitiveness of a horse. The identification of the cause of lameness originating from the MP joint can be challenging, given the limitations of radiography, ultrasonography, and nuclear scintigraphy. Our purpose was to describe the injury types and incidence in magnetic resonance imaging (MRI) studies from 40 horses with lameness attributable to the MP joint region where it was not possible to reach a clinically plausible diagnosis using other imaging modalities.

Category: Equine - Imaging - Lameness - MRI
Authors: A. E. Poulin Braim*, R. J. W. Bell, J. A. Textor † , W. Y. Lo, S. M. Puchalski † and L. D. Galuppo †
Journal: Equine Veterinary Education

A 2-year-old Thoroughbred filly presented to the William R. Pritchard Veterinary Medical Teaching Hospital at the University of California at Davis for whole body nuclear scintigraphic evaluation after an acute onset of nonweightbearing right hindlimb lameness post race. The use of computed tomography (CT) enabled visualisation of additional pathology that was not initially appreciable using combined imaging modalities of nuclear scintigraphy and digital radiography, which ultimately altered the selected course of treatment.

Authors: Julien Olive, DMV, MSc; Marc-André d'Anjou, DMV; Kate Alexander, DMV, MS; Guy Beauchamp, PhD; Christine L. Theoret, DMV, PhD
Journal: American Journal of Veterinary Research

Objective—To evaluate the ability of signal attenuation–based quantitative magnetic resonance imaging (QMRI) to estimate subchondral bone mineral density (BMD) as assessed via quantitative computed tomography (QCT) in osteoarthritic joints of horses.

Sample Population—20 metacarpophalangeal joints from 10 horse cadavers.

Category: Bone - Comparative Study - CT - Equine - Imaging - MRI
Authors: W. R. Redding and A. P. Pease †
Journal: Equine Veterinary Education

Diagnosis of lameness associated with the shoulder region requires a careful clinical examination, the use of specifically placed intra-articular analgesia and a combination of some common imaging techniques to accurately define the source of pain. Most equine practices performing lameness examinations in the horse have the radiographic and ultrasonographic equipment necessary to accurately image the shoulder.

Category: Equine - Imaging
Authors: S. DYSON*, R. POOL † , T. BLUNDEN ‡ and R. MURRAY
Journal: Equine Veterinary Journal

Reasons for performing study: There is limited knowledge about the interpretation of alterations in the distal sesamoidean impar ligament (DSIL) detected using magnetic resonance imaging (MRI) and their correlation with histopathology.

Hypotheses: There would be: 1) a correlation between histopathology and MRI findings; and 2) a relationship between MR abnormalities at the origin and the insertion of the DSIL, between insertion and body; and origin and body.

Category: Equine - Imaging - Ligament - MRI
Authors: Withers, J.M.; Voûte, L.C.; Hammond, G.; Lischer, C.J.
Journal: Equine Veterinary Journal

Reasons for performing study: Plain radiography is the standard imaging technique for investigation of diseases associated with the articular process joints (APJ) of the caudal neck; however, the radiographic anatomy of these structures on both lateral and oblique radiographic projections has not previously been described in detail.

Authors: Olive, J.; D'Anjou, M.-A.; Girard, C.; Laverty, S.; Theoret, C.L.
Journal: Equine Veterinary Journal

Reasons for performing study: Marginal osteophytes represent a well known component of osteoarthritis in man and animals. Conversely, central subchondral osteophytes (COs), which are commonly present in human knees with osteoarthritis, have not been reported in horses.

Objectives: To describe and compare computed radiography (CR), single-slice computed tomography (CT), 1.5 Tesla magnetic resonance imaging (MRI), and histological features of COs in equine metacarpophalangeal joints with macroscopic evidence of naturally-occurring osteoarthritis.

Authors: McLellan, J.; Plevin, S.; Hammock, P.D.; BonenClark, G.
Journal: Equine Veterinary Education

Patellar chondromalacia is rarely reported in the horse. In this study, several noninvasive diagnostic modalities were combined to diagnose patellar chondromalacia in a horse, later confirmed by arthroscopy. Radiography failed to demonstrate pathology; nuclear scintigraphy localised the disease process to the left femoropatellar region; and ultrasonography identified pathological changes within the affected joint. It is possible that this disease is under-reported in the literature due to the difficulty in accurately diagnosing the condition.