METHOD FOR MECHANICAL SIMULATION OF EXTERNAL ROTATION CONTRACTURE OF HIP JOINT IN EXPERIMENT MODULE OF HIP IMPLANT Russian patent published in 2015 - IPC G09B23/28 

FIELD: medicine.

SUBSTANCE: method for mechanical simulation of an external rotation contracture of a hip joint in an experimental unit of a hip implant consists in using the experiment unit of a hip implant comprising a head fixed on a holder, a polyethylene insert of a metal cup or a polyethylene cup and a device for cup fixation. The head consists of ceramics or metal alloys and has a rough surface. A device for cup fixation enables changing the position of the polyethylene insert of the metal cup or the polyethylene cup. The head is clamped experimentally on a holder in any of two collets of a universal test machine. The device with the polyethylene insert of the metal cup or the polyethylene cup is mounted in the other collet of the universal test machine so that the head is immersed completely into the polyethylene insert of the metal cup or the polyethylene cup. The head of the module is mounted in the polyethylene insert of the metal cup or the polyethylene cup so that a long axis of the head is deviated from a plane of an input into the polyethylene cup or polyethylene insert of the metal cup of the module of the implant by 10 degrees that corresponds to the outer rotation contracture of the degree 1 hip joint. The head of the module is placed into the polyethylene insert of the metal cup or the polyethylene cup so that the long axis of the head is deviated from the plane of the input into the polyethylene cup or polyethylene insert of the metal cup of the module of the implant by 20 degrees that corresponds to the outer rotation contracture of the degree 2 hip joint. The head of the module is placed further into the polyethylene insert of the metal cup or the polyethylene cup so that the long axis of the head is deviated from the plane of the input into the polyethylene cup or polyethylene insert of the metal cup of the module of the implant by 30 degrees that corresponds to the outer rotation contracture of the degree 3 hip joint.

EFFECT: setting up the clinical-biomechanical correspondence between a horizontal inclination angle and a degree of the external rotation contracture of the experiment module of the hip joint for the purpose of extrapolating the obtained experimental data of polyethylene abrasive wear to the clinics for the purpose of early and remote results of endoprosthesis replacement in the patients with external rotation contracture of the hip joint.

9 dwg