Authors: Gary M. Baxter VMD, MS and Scott Morrison DVM
Journal: Veterinary Clinics of North America: Equine Practice

The most common and significant complication of excessive unilateral weight bearing in adult horses is support limb laminitis. Young horses with unilateral lameness problems develop support limb laminitis infrequently compared with adult horses.

Category: Equine - Lameness
Authors: Little, D.; Redding, W.R.; Gerard, M.P.
Journal: Equine Veterinary Education

This report documents the case presentation, evaluation, treatment and outcome of 5 horses with an osseous cyst-like lesion (OCLL) of the intertubercular groove of the proximal aspect of the humerus. In 3 of the 5 cases, delayed phase gamma scintigraphic findings demonstrated increased radiopharmaceutical uptake in the region of the intermediate tubercle of the proximal humerus of the affected limb, demonstrating increased bone remodelling in this region.

Category: Case study - Equine - Lameness
Authors: Byam-Cook, K.L.; Singer, E.R.
Journal: Equine Veterinary Journal

Reasons for performing study: Despite the possibility that sound horses may have radiographic signs consistent with osteoarthritis of the small tarsal joints (OA-STJ), a diagnosis of 'bone spavin' as a cause of lameness is often made based only on radiographic examination. Objectives: To determine whether severity of radiographic change and response to treatment are correlated with the duration and degree of lameness and the response to intra-articular anaesthesia in horses with OA-STJ.

Authors: Parkes, R.S.V.; Weller, R.; Groth, A.M.; May, S.; Pfau, T.
Journal: Equine Veterinary Journal

Reasons for performing study: Visual assessment of horses' movements is subjective, affected by bias and dependent on the level of experience of the assessor. However, to date there are no data available on the ability of the human visual system to recognise (a)symmetry in moving objects.

Objectives: To investigate, using visual lameness assessment, the limits of human perception and the ability of experienced and nonexperienced individuals to detect asymmetry in 2 moving objects simulating hindlimb lameness in the horse.

Authors: J. Declercq; A. Martens; D. Maes; B. Boussauw; R. Forsyth; K. J. Boening
Journal: Veterinary and Comparative Orthopaedics and Traumatology

The objective of the present study was to determine clinical and arthroscopic characteristics associated with dorsoproximal proximal phalanx (P1) fragments in Warmblood horses, as well as to examine their histopathological appearance. One hundred sixty-eight fragments were removed from 150 fetlocks of 117 Warmblood horses. Details of signalment and results of clinical examination were collected prior to surgery. After arthroscopic fragment removal and joint evaluation for synovial and/or cartilage abnormalities, the fragments were measured and evaluated histopathologically.

Authors: Alastair T. Kay, BVSc; David M. Bolt, Dr med vet, MS; Akikazu Ishihara, BVSc; Paivi J. Rajala-Schultz, DVM, PhD; Alicia L. Bertone, DVM, PhD
Journal: American Journal of Veterinary Research

Objective—To assess analgesia, inflammation, potency, and duration of action associated with intra-articular injection of triamcinolone acetonide (TA), mepivacaine hydrochloride, or both in metacarpophalangeal (MCP) joints of horses with experimentally induced acute synovitis.

Animals—18 horses.

Category: Equine - Lameness - Treatment
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: Dyson, P.K.; Jackson, B.F.; Pfeiffer, D.U.; Price, J.S.
Journal: Equine Veterinary Journal

Reasons for performing study: The first major epidemiological study of injury incidence in the UK flat racing Thoroughbred (TB), published in 1985, found lameness to be the single largest reason for days when horses failed to train. It was considered advisable to ascertain if progress has been made in reducing the problem of musculoskeletal injuries in the intervening period.

Objective: To quantify injury incidence and days lost from training by 2- and 3-year-old TBs in UK training yards during 2002 and 2003.

Category: Equine - Lameness
Authors: Mair, T.S.; Sherlock, C.E.
Journal: Equine Veterinary Education

The purpose of this study was to describe the frequency of occurrence of severe ossification of the collateral cartilages (sidebone) coexistent with collateral desmitis of the distal interphalangeal joint (DIPJ) in lame horses. Sidebone was diagnosed and graded on standard radiographs and soft tissue injuries of the foot were diagnosed using standing low-field magnetic resonance imaging (MRI). Of 15 horses with forelimb lameness and severe sidebone, 9 had evidence of concurrent collateral desmitis of the DIPJ.

Category: Equine - Lameness - Ligament
Journal: Veterinary surgery

Objective—To describe pathologic changes in the deep branch of the lateral plantar nerve (DBLPN) of horses determined to be lame because of proximal suspensory desmitis (PSD), and to report the outcome after treatment by excision of a segment of the horses' DBLPN. Study Design—Retrospective case series. Animals—Adult horses (n=16). Methods—Horses determined to be lame on one or both pelvic limbs because of PSD were treated by excision of a segment of the DBLPN, and 30 nerves were examined histologically.

Category: Equine - Lameness - Ligament