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Focused and Radial Extracorporeal Shock Wave Therapy on Equine Bone Microdamage
In this ex vivo experimental model study, the investigators tried to determine whether bone microcracks are altered after application of focused and radial extracorporeal shock wave therapy (ESWT) to the equine distal limb. The preliminary result: This method has the potential to increase bone microcracking in equine distal limb bone in vivo.


A contralateral limb specimen was obtained from 11 Thoroughbred racehorses with a unilateral catastrophic injury. Distal limb specimens were also obtained from 5 non-racing horses.

Three separate skin-covered bone segments were obtained from the mid-diaphysis of the metacarpus (MC3) or metatarsus (MT3). Focused (9,000 shockwaves, 0.15 mJ/mm2, 4 Hz) and radial (9,000 shockwaves, 0.175 mJ/mm2, 4 Hz) ESWT treatments were randomized to the proximal and distal segments and the middle segment was used as a treatment control for pre-existing microcracks. After treatment, bone specimens were bulk-stained with basic fuchsin and microcracks were quantified in transverse calcified bone sections.

ESWT had small but significant effects on microcracks. Microcrack density (Cr.Dn) and microcrack surface density (Cr.S.Dn) were increased after focused ESWT, whereas Cr.Le was increased after radial ESWT. In racing Thoroughbreds, Cr.Le increased with increased number of races undertaken. Cr.Dn and Cr.S.Dn were not significantly influenced by the number of races undertaken.

ESWT has small but significant effects on bone microcracking ex vivo.

These preliminary data suggest that ESWT has the potential to increase bone microcracking in equine distal limb bone in vivo. Such effects may be more pronounced in Thoroughbreds that are actively being raced, because in vivo microcracking increases with increased number of races undertaken.

Source: Da costa Gömez, Támara M., Radtke, Catherine L., Kalscheur, Vicki L., Swain, Carol A., Scollay, Mary C., Edwards, Ryland B., Santschi, Elizabeth M., Markel, Mark D. & Muir, Peter (2004): Effect of Focused and Radial Extracorporeal Shock Wave Therapy on Equine Bone Microdamage. In: Veterinary Surgery 33 (1), pp 49-55.



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EQUINE

CT diagnosis of fatigue fracture of Mt 3 in young adult horsesmembers
Two young adult endurance horses were presented for investigation of sudden-onset forelimb lameness during competition. Clinical examination revealed a severe forelimb lameness and pain on palpation of the proximal palmar metacarpal area. Initial radiographic survey of the affected forelimb was unremarkable in both cases. A week of box rest resulted in only a mild improvement in the lameness. A second radiographic examination did not reveal any significant abnormalities. The history is very suspicious for a fracture, especially a fatigue fracture. How was it diagnosed and treated finally?

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