The decentration of the endoprosthesis head in the acetabular element due to the wearout of the polyethylene component

From the anamnesis: According to the patient, and, according to medical data, in 2004, right hip joint replacement was performed due to dysplastic coxarthrosis. In 2008, an total hip replacement of left joint was performed due to left-sided dysplastic coxarthrosis.

Since 2010, recurring pain in right hip joint. Since the beginning of 2016, due to pain in the right hip, the patient was using crutches.

Radiographs of the hip joints on the right were diagnosed: the decentration of the endoprosthesis head in the acetabular element due to the wearout of the polyethylene component. To assess the defect of the acetabulum, computed tomography of the pelvis with hip joints was performed: resorption of bone tissue around the acetabulum and signs of its instability were found.

Concomitant diseases: Alimentary obesity II degree. BMI 35. Varicose disease I degree. CVI I.

The patient was operated on 06/03/2017

Revision of the right hip joint, removal of the unstable acetabular component. Installation of an individually made metal acetabular component (titanium alloy) with a polyethylene Cement-Type Ceramic Fixing Cup. The outer surface of the metal component is porous, the outer diameter is 54 mm, the inner diameter is 47 mm. The metal acetabular component is reinforced with four screws 6.5 mm in diameter.

Rehabilitation: the period of walking with additional support(crutches) with additional load on the right leg was about 2 months, another month of walking with a cane. Three months later, the patient went to work.