External splint for the treatment of fractures of the long bones of limbs

External splint for the treatment of fractures of the long bones of limb, comprising a tubular body which defines a cylindrical cavity and has an end which prismatically engages a seat of a box-like element which is coupled to said body by means of a cannulated screw which is rotatably supported in said element and is screwed in a threaded hole defined in said end transversely to the axis of said cylindrical cavity, the actuation of said screw causing the movement of the tubular body in the seat of the box-like element, said cannulated screw accommodating a strain-gauge for monitoring the behavior of the splint, a first supporting means for a first series of nail-holder clamps being coupled to the box-like element so that it can be orientated along two orthogonal axes, a second supporting means for a second series of nail-holder clamps being coupled in said cylindrical cavity of said tubular body so that it can be adjusted along an axis which is substantially perpendicular to said two orthogonal axes.