DEVICE FOR DETERMINING THE OPTIMAL LAYOUTS OF AN ORTHOPEDIC HEXAPOD USED TO DEVELOP MOVEMENTS IN KNEE JOINT CONTRACTURES AND A METHOD FOR ITS USE Russian patent published in 2021 - IPC G09B23/28 G09B23/30 

FIELD: medicine.

SUBSTANCE: artificial limb model includes models of the femur and tibia, pivotally connected to form a model of the knee joint. The limb model additionally includes a femoral soft tissue model and a tibial soft tissue model located on the corresponding femoral and tibial bone models, each of which is divided into eight levels, according to the method for unified designation of transosseous osteosynthesis. The model has individual parameters of the patient’s limb, including at least the length of the thigh and lower leg, as well as the circumference of the thigh and lower leg in at least three parts for each. A method for determining the optimal layouts of an orthopedic hexapod used to develop movements with knee joint contractures, carried out on the above model by means of an orthopedic hexapod, including a set of static modules, mobile modules, telescopic racks and transosseous elements. The method includes the following steps: determining the individual parameters of the patient’s limb, including at least the length of the thigh and lower leg, as well as the circumference of the thigh and lower leg in at least three parts for each; according to the obtained individual parameters of the patient’s limb, an artificial model of the patient’s limb is made or selected, previously made above, corresponding in size; eight levels are identified for the thigh segment and the lower leg segment on the artificial limb model of the patient according to the method of unified designation of transosseous osteosynthesis; in the proximal segment of the thigh segment, at levels I-II, and on the distal segment of the lower leg segment, at levels VI-VII, static modules are applied and fixed on the artificial limb model of the patient by means of transosseous elements; the corresponding mobile modules are fixed to the static modules by means of telescopic racks, which, when changing the lengths of the telescopic racks, are made with the possibility of changing the angle of inclination and movement along the levels of the segment of the lower leg and the segment of the thigh, respectively; the mobile module of the segment of the thigh and the mobile module of the segment of the lower leg are interconnected by six telescopic racks to form a hexapod in the knee joint area on an artificial model of the patient’s limb; the telescopic racks are switched to a mode in which the length of each of the telescopic racks is not fixed and the mobile modules are made with the possibility of free linear movement and rotation at a given angle relative to each other; the initial position of each of the mobile modules is set by freely moving the mobile modules and changing the lengths of the telescopic racks, then the knee joint of the artificial limb model of the patient is flexed until at least one of the telescopic hexapod stands touches the soft tissues of the artificial limb model of the patient, after which the flexion amplitude and the distance from each of the telescopic racks to the soft tissues of the artificial limb model of the patient are recorded; the hexapod is rewired by introducing additional structural elements of the device that increase the distance between the telescopic racks and the soft tissues of the artificial limb model of the patient, then the flexion amplitude and the distance from each of the telescopic racks to the soft tissues of the artificial limb model of the patient are re-recorded; rewiring is performed until the optimal layout of the orthopedic hexapod is obtained, which ensures that the hexapod elements do not contact the soft tissues of the artificial limb model of the patient when flexing within an amplitude from 0° to 120°; the optimal layout of the orthopedic hexapod is recorded for the individual parameters of the patient’s limb.

EFFECT: inventions ensure the exclusion of undesirable contact of hexapod elements with the soft tissues of the patient’s thigh and lower leg when bending within 120°, while simplifying and facilitating the procedure for rewiring the apparatus to determine the optimal layouts of the orthopedic hexapod.

5 cl, 21 dwg