METHOD FOR ANATOMIC SURGICAL SIMULATION OF EXTERNAL ROTATIONAL HIP CONTRACTURE EXPERIMENTALLY

摘要

FIELD: medicine.SUBSTANCE: hip joint of Kocher-Langenbeck type is posteriorly approached on an unclaimed corpse. External hip rotators are separated from an anatomic attachment to the hip. Femoral head and neck, and edges of a cotyloid cavity are exposed. A guide pin locating a plane line of an entry into a cotyloid cavity in a horizontal section of the hip joint is laid. That is followed by an osteotomy of the femoral neck and head in the horizontal plane. The guide pin is delivered through an apex base of a greater trochanter in the direction from the outside inwards along a long axis of the femoral neck and head along the horizontal plane of the osteotomised femoral head and neck up to a subchondral medial edge of the femoral head. A horizontal hip inclination angle is simulated with a lower limb with a knee bent at 45° by hip rotation with internal ankle rotation so that a measured crossing angle of the guide pins is 56°. The shortened external hip rotations are simulated by a temporary fixation of the external hip rotators to the anatomic attachment in a trochanteric fossa at the horizontal hip inclination angle of 56° with a negligible tension of the external hip rotators. It is predicted to correspond to the degree 1 external rotational hip contracture. That is followed by similar actions with the horizontal hip inclination angle of 46° that corresponds to the degree 2 external rotational hip contracture. The horizontal hip inclination angle of 36° corresponds to the degree 3 external rotational hip contracture.EFFECT: method enables performing the accurate antropometric measurements at a true angle by the anatomic surgical simulation of the external rotational hip contracture experimentally.5 dwg