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Incomplete Longitudinal Fractures of the Plantar Aspect of the Third Metatarsal Bone in Horses

By Jane C. Boswell, MA, VetMB, CertVA, CertES (Orth), DECVS, MRCVS, The Liphook Equine Hospital ; James K. Belknap, DVM, PhD, DACVS, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Ohio State University ; Tracy A. Turner, DVM, MS, Anoka Equine Veterinary Services ; Peter Clegg, MA, Vet MB, DipECVS, PhD, MRCVS, Veterinary Teaching Hospital, School of Veterinary Sciences, University of Liverpool ; Matthew T. Brokken, DVM, The Ohio State University ; Marcus J. Head, BVetMed, Rossdales Equine Hospital and Diagnostic Centre ; James Schumacher, DVM, MS, Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee ; John Schumacher, DVM, MS, Department of Clinical Sciences, College of Veterinary Medicine, Auburn University ; Chris Whitton, BVSc, FANZCVS, PhD, Equine Centre, University of Melbourne

Stress reaction and incomplete longitudinal fractures of the plantar aspect of the third metatarsal bone may occur due to stress-related bone injury at the origin of the suspensory ligament. These are usually associated with increased uptake of radionuclide on bone scintigraphy and are clearly demonstrable on MRI.