Enhancement of Bone Healing by Static Magnetic Field in the Dog :Biomechanical Study

Objective- Although the promotional effects on bone healing of pulsed electromagnetic fields (PEMF)have been well demonstrated, the effects of static magnetic fields (SMF) remained unclear. In this study,effects of SMFs on clinical and biomechanical aspects of bone healing using a canine unstable osteotomygap model were investigated .Design- Prospective descriptive trial.Animals- Fifteen mongrel dogs, 4 to 5 years old and weighing 15.5 to 21.3 kg.Procedures- After an osteotomy of the midshaft radius , bone healing was evaluated over an 8-weekperiod in control dogs (n = 5) and experimental dogs exposed to medium (700 gauss) (MSMF) and high (1500 ga uss) (HSMF) magnetic fields (n = five/each group). Bone heal ing was assessed clinicall y andbiomechanically .Results- Dogs exposed to HSMF had more improved lameness scores in co ntras t to the MSMF andcontrol dogs. Significantly, greater for ces (p O.V5j we re req uired to hreak theos teotomized radi i exosedto HSMF as compared with MSMF and controlones .Conclusions and Clinical Relevance- These results suggested that using theos teotomy gap model ,HSMF enhanced the clinica l and biomech an cal aspects of bone healing in dogs . Dogs at rik for delayedhealin g of fractures may benefit from treatment with HSM F.