Reconstruction of segmental defects during revision procedures of the acetabulum with the Burch-Schneider anti-protrusio cage

Sixty-three Burch-Schneider rings in 62 patients with segmental or combined defects were followed up after a mean of 5.45 years. The mean Harris hip s core was 74.9 points. Aseptic loosening occurred in 3 cases, and septic loo sening occurred in 2 cases. All cases of aseptic loosening had Paprosky sta ge IIIb defects and defects of the posterior column. Radiologic migration a nalysis showed increased migration with increase in the Paprosky defect sta ge, defects of the posterior Column, and cranial defects. The cage has the lowest migration and loosening rate in cases with medial defects or anterio r column defects. Surgical treatment of defects of the posterior column is associated with an increased rate of aseptic loosening, whereas implantatio n with cranial defects shows a higher migration rate with no significant in crease in loosening.