METHOD OF INCREASE OF THE FLEXURAL STIFFNESS OF THE LEG OF HIP ENDOPROSTHESIS AND THE DESIGN OF THE LEG FOR ITS IMPLEMENTATION

摘要

FIELD: medicine.SUBSTANCE: invention relates to medicine. Method for increasing the flexural stiffness of the leg of a hip endoprosthesis with a longitudinal through hole having chamfers at the ends. Beveled cylindrical core insert is used. Leg is pre-cooled, causing a reduction in length, a cylindrical core insert is placed in the hole, which is preheated, causing an increase in its length, expand the ends of the insert, ensuring its fixation in the hole of the foot, bring the temperature of the stem and insert to the original temperature, facilitating the appearance in the material of the legs of stretching, but in the material of insertion of compressive axial stresses, and thereby create a total compressive stress in the material of the leg, increasing the density of the structure of the material in the axial direction and increasing flexural rigidity. Pre-stretched cylindrical insert installed in the through-hole is fixed from movement in the axial direction by means of thickenings at the ends, gaplessly placed in the conical cavities formed by the facets of the through hole of the leg.EFFECT: invention provides for simplifying the design, increasing the service life, eliminating the negative consequences of revision operations in case of fracture of the stem part of the leg and replacement of the stem, and reduction of the operation time.1 cl, 7 dwg