Authors: Valerie Simon, Sue J. Dyson
Journal: Veterinary Radiology and Ultrasound

We compared the radiographic and scintigraphic findings in the third carpal bone of horses performing different work disciplines and investigated their relationship with lameness. Horses had undergone carpal radiography including acquisition of a dorsoproximal-dorsodistal oblique (DPr-DDiO) image of the distal row of carpal bones and/or scintigraphic examination of the carpi. Cause of lameness, breed, age, and work discipline were recorded.

Authors: J. M. Cohen, L. L. Southwood, J. Engiles, M. Leitch, D. M. Nunamaker
Journal: Veterinary and Comparative Orthopaedics and Traumatology

Objective: To examine the efficacy and biocompatibility of a thiolated gelatin-thiolated carboxymethyl hyaluronan (CMHA-SGX) sponge as an osteoconductive device in an equine second and fourth metacarpal bone defect model. Methods: Seven millimetre segmental ostectomies were created bilaterally in the second and fourth metacarpal bones of four horses. The left and right metacarpal defects were randomly assigned to (1) be filled with a CMHA-SGX sponge (treated) or (2) were left unfilled (control). The duration of the study was nine weeks.

Category: Bone - Equine
Authors: Scott A. Katzman, DVM, DACVS et al.
Journal: Journal of the American Veterinary Medical Association

Objective—To assess clinical outcomes and scintigraphic findings in horses with a bone fragility disorder (BFD) treated with zoledronate (a nitrogen-containing bisphosphonate). Design—Prospective uncontrolled clinical trial. Animals—10 horses with evidence of a BFD. Procedures—Signalment, history, and geographic location of horses' home environments were recorded. Physical examinations, lameness evaluations, and nuclear scintigraphy were performed. Diagnosis of a BFD was made on the basis of results of clinical and scintigraphic examination.

Category: Bone - Equine
Authors: Jonathan McLellan, BVMS; Sarah Plevin, BVMS, DABVP; Elizabeth Taylor, DVM
Journal: Journal of the American Veterinary Medical Association

Case Description—3 horses were evaluated because of lameness and swelling of the stifle joint subsequent to trauma.

Clinical Findings—All horses had characteristic clinical signs of stifle joint pain and effusion. A medial patellar fracture and lateral collateral ligament avulsion fracture were visible ultrasonographically in each. Radiography, including standard as well as flexed lateromedial, cranioproximal-craniodistal oblique (skyline patellar), and laterally stressed caudocranial views, revealed similar findings.

Category: Bone - Equine - Ligament - Traumatology
Authors: Astrid B.M. Rijkenhuizen, Kim de Graaf, Annelieke Hak, Anton Fürst, Frerik ter Braake, Christian Stanek, Tim R.C. Greet
Journal: The Veterinary Journal

A multicentre study of 285 cases was performed to enhance the management of distal phalangeal fractures on the basis of clinical evidence. The outcome after treatment was available for 223 of the cases. Horses with a non-articular type I fracture had a better prognosis (91.7%) for return to original or expected level of use than horses with an articular type II or III fracture (69.6% and 74.1%, respectively). The prognosis for types IV and V fractures was fair (57.7% and 57.1%, respectively) and for type VI good (80%).

Category: Bone - Equine - Traumatology
Authors: Timothy B. Lescun, BVSc, MS; Debra K. Baird, DVM, PhD; Laurinda J. Oliver, BVSc, MS; Stephen B. Adams, DVM, MS; Jan F. Hawkins, DVM; George E. Moore, DVM, PhD
Journal: American Journal of Veterinary Research

Objective—To determine the extent to which a hydroxyapatite coating promotes pin stability in the third metacarpal bone during transfixation casting in horses.

Animals—14 adult horses.

Authors: Louise L. Southwood, Christopher E. Kawcak, Chisa Hidaka, C. Wayne Mcilwraith, Natasha Werpy, Jennifer Macleay, David D. Frisbie
Journal: Veterinary Surgery

To evaluate gene transfer in an equine metacarpal IV (MCIV) ostectomy model using adenoviral vectors encoding the human bone morphogenetic protein-2 and protein-7 gene (Ad-BMP-2/-7).
Study Design
Healthy adult horses (n = 15).

Category: Bone - Equine
Authors: M. BIGGI, S. DYSON
Journal: Equine Veterinary Journal

Reasons for performing study: The significance of distal border fragments of the navicular bone is not well understood. There are also no objective data about changes in thickness and proximal/distal extension of the palmar cortex of the navicular bone.

Objectives: To describe the distribution of distal border fragments and their association with other radiological abnormalities of the navicular bone and describe the shape of the navicular bone in sound horses and horses with foot-related lameness, including navicular pathology.

Category: Bone - Equine - Radiography
Journal: Equine Veterinary Journal

Reasons for performing study: Although a well recognised clinical entity, only small numbers of osteochondromata on the caudal distal radius have previously been published and its occurrence in young racing Thoroughbreds has not previously been reported. Identification and management of associated lesions in the deep digital flexor tendon have received scant attention in the literature.

Authors: M. Biggi, D. D. Zani, D. De Zani, M. Di Giancamillo
Journal: Equine Veterinary Education

Three horses with sudden onset severe lameness were admitted for further diagnostic investigation. All horses had variable changes on radiographs in the distal tarsal region. Because of the sudden onset and severe degree of lameness, a magnetic resonance imaging (MRI) examination was performed. All horses showed areas of increased signal intensity in short tau inversion recovery (STIR) images involving the central and/or third tarsal bones. These lesions involved both the subchondral bone and bone marrow and are currently defined as bone marrow lesions (BML).

Category: Bone - Equine - MRI