Mechanical properties of the electrically stimulated callus. An experiment with constant direct current in rabbit fibulae.

The investigation of the effect of direct current on the mechanical properties of experimental fractures was conducted by applying 7-10 microA of constant current to the osseous defect of the rabbits' fibulae. The fibulae were tested mechanically with the combined methods of nondestructive technique and breaking-strength measurement. The result was analyzed in relation to the volume of the newly formed callus, which was estimated by roentgenographic appearance and calculation. There is no accurate proof that an electrically stimulated callus is superior in mechanical strength. A more massive callus in a relatively earlier stage suggests that the stimulated callus may have some advantages over the nonstimulated callus.