Fig. 4

Female, 70 years old, femoral neck fracture (A). THA with mesh reconstruction was performed in this patient (B). Follow-up MRI (C, D) at six months after surgery showed that mesh was clung to the posterior femur without loosening sign (red arrows). The blue dashed line is the femur, the white dashed line is the mesh, the pentagram is the sciatic nerve. Detailed radiological measurements are shown in B acetabular anteversion angle = sin⁻¹ (a/b); acetabular abduction angle = the angle between b and x; lower extremity length difference = e − h; offset difference = c + d − (m + n)