METHOD FOR REMOVAL OF FEMORAL BONE WITH SIMULTANEOUS RESTORATION OF BIOMECHANICAL LIMB AXLE Russian patent published in 2012 - IPC A61B17/56 

FIELD: medicine.

SUBSTANCE: invention is referred to the field of medicine, namely to the traumatology and orthopedics. Before surgery on the basis of the results of X-ray imaging of both lower extremities made on one film in direct view and on another film in lateral view the absolute shortening of femoral bone and position of anatomical and biomechanical limb axles are determined. In the proximal femur from the lateral side two endosseous pins are entered, each at the angle 90 degrees to the bone in such a way that upper endosseous pin is located below the growth zone of greater trochanter and the lower one is placed above the line of planned corticotomy. On the distal femur the endosseous pins are located accordingly: upper one is below the osteotomy line, lower one is above the growth zone of femur condyles. On each bone fragment the pins are placed at the angle to each other. The apparatus is centered so that it is strictly parallel to the femoral bone axle in two views. After mounting distal and proximal support are connecting using a couple of threaded bars that are lateral relative to femur and a couple of composite medial bars. Both parts of medial bars are connected with hinge joints that are installed below the corticotomy line on the distance that equals half of the length of presumed distraction regenerate. The corticotomy is performed in the medium third - upper third of the femoral bone. The apparatus systems are stabilized. Control X-ray image is performed. In post operational period on the day 5-6 the dosed distraction is performed on all threaded bars turning the nuts on lower support. After the end of distraction regenerate formation control X-ray image is made. The interrelation of anatomical and biomechanical axles of limb segments is performed. If necessary the biomechanical limb axle is restored by the way of distraction regenerate correction by the angle depending on the size of regenerate formed using pre-build relation of size of correction angle of formed regenerate from the length of this regenerate. The regenerate correction is performed by the way of distraction on lateral bars using the dependence of number of nut turns from the deformation angle of distraction regenerate. The correction in sagittal plane is performed by using spherical nuts and holes with double-sided countersink on the butt ends of the supports in the apparatus.

EFFECT: method provides for elongation of femoral bone with restoration of right interrelation of lower limb segments in sagittal and frontal view without additional surgical intervention, decreased injury risk.

2 cl, 5 dwg