Osteochondroma formation at the distal end of the diaphysis and metaphysis of the radius is usually seen in young animals. The typical clinical history is swelling of the carpal canal sheath cranial to the ulnaris lateralis after exercise (often resolving in a few hours); bloody effusion may also be present. At exercise, these horses exhibit moderate lameness. Deep palpation may elicit tenderness and a withdrawal response. Pain is usually elicited with rapid flexion. Diagnosis is generally made by radiography, but ultrasonic examination may be necessary to define the presence of the osteochondroma. The condition can be treated successfully via arthroscopic surgery. The protruding osteochondroma is removed and any concomitant damage to the deep flexor tendon debrided. The prognosis is good.
Last full review/revision March 2012 by Stephen B. Adams, DVM, MS, DACVS; Joerg A. Auer, DrMedVet, Dr h c, MS, DACVS, DECVS; James K. Belknap, DVM, PhD, DACVS; Jane C. Boswell, MA, VetMB, CertVA, CertES (Orth), DECVS, MRCVS; Peter Clegg, MA, Vet MB, PhD, CertEO, DECVS, MRCVS; Andrew L. Crawford, BVetMed, CertES (Orth), MRCVS; Jean-Marie Denoix, DVM, PhD, Agregé; Marcus J. Head, BVetMed, MRCVS; C. Wayne McIlwraith, BVSc, PhD, DSc, FRCVS, DACVS, DACVSMR; James Schumacher, DVM, MS, DACVS, MRCVS; John Schumacher, DVM, MS, DACVIM; Roger K. W. Smith, MA, VetMB, PhD, DEO, DECVS, MRCVS; Chris Whitton, BVSc, FACVSc, PhD