METHOD OF MULTISPIRAL COMPUTER TOMOGRAPHY OF SLOWLY CONSOLIDATED DISTRACTION REGENERATES OF LONG BONES OF LIMBS Russian patent published in 2017 - IPC A61B6/03 

FIELD: medicine.

SUBSTANCE: invention relates to a method for multislice computed tomography of delayed consolidating distraction reductions (DCDR) of long limb bones (LLB) after repeated previous surgical interventions to compensate for the shortening of the patient's limb. Determining the spatial structure of the DCDR by performing 64 slices per revolution of the gantry with the cut thickness 0.625 mm, without tilting the gantry with a voltage of 120 kV, a current of 175 mA, in a time of 2.2 seconds at a pitch of 0.516:1. Using an overview transcript of 150-250 mm, multiplanar reconstruction of the image in two mutually perpendicular planes is performed - the frontal and sagittal planes, which reveal the localization, volume and character of the internal structure of the DCDR, as well as possible formed bone defects of the cortical layer of the DCDR. An evaluation of the stage of formation of the cortical layer of DCDR on axial sections is carried out by measuring the density along the perimeter of the patient's DCDR cortical layer in Hounsfield's unit (HU) and the density of the maternal bone in HU along its perimeter in its proximal and distal fragments adjacent to the DCDR. The value of the relative density is calculated - the ratio of the arithmetic mean density of the cortical layer of the patient DCDR to the index of the arithmetic mean density of its maternal bone in its proximal and distal sections adjacent to the DCDR. If the relative density is above 0.77, the fact of the passage of the natural consolidation of DCDR is established with sufficient metabolic maturity in the formation of compact bone tissue. At a value below 0.77, the fact of natural consolidation of DCDR with insufficient metabolic maturity is established, with a slow rate of formation of compact bone tissue.

EFFECT: method provides an accurate definition of the localization, volume, nature of the internal structure of the distraction regenerate, possible formed bone defects of the cortical layer.

2 cl, 3 ex