Endoprosthetics of the hip joint with intraoperative elimination of external rotation of the lower extremities

In some cases of coxarthrosis (dysplastic, rheumatoid, coxarthrosis as a result of the prior head femur epiphysiolysis, Legg-Calve-Perthes disease and 4-5th stage ) the external rotation in combination with flexion-adducting contracture of hip joint is noted. Long-lasting pathologic process results in gradual increase of external hip rotation. Thus the anterior lever of the hip joint and the anterior segment of the capsule are elongated significantly. Simultaneously the shortening of the posterior lever of the joint and posterior segment of the capsule takes place. Uncorrected disturbance between two levers makes difficulties when the implant head is to be correctly placed in the acetabulum and also results in recurrent external rotation, redistribution of friction forces between the head and the cup of the implant and finally the rapid.