The use of reinforcement rings to reconstruct deficient acetabula

J Bone Joint Surg Br. 1992 Sep;74(5):716-20. doi: 10.1302/0301-620X.74B5.1527120.


We reviewed 64 patients in whom 66 acetabula had been reconstructed with either the Müller ring (46) or the Burch-Schneider anti-protrusio cage (20) at a mean follow-up of five years. Five hips had been revised a second time for loosening, all after a Müller ring had been used for a medial segmental defect (2), ungrafted cavitary defects (2) or after resorption of a block graft (1). The use of bone grafts with the implants reduced the incidence of failure from 13% to 6% and of circumferential radiolucent lines at the bone-implant interface from 39% to 2%. The Müller ring is indicated for acetabula with isolated peripheral segmental defects or cavitary defects confined to one or two sectors. The Burch-Schneider cage should be used for medial segmental defects, extensive cavitary defects and combined deficiencies. Defects should be reconstituted with bone graft rather than cement.

Publication types

  • Comparative Study

MeSH terms

  • Acetabulum / surgery*
  • Adult
  • Aged
  • Bone Screws
  • Bone Transplantation
  • Evaluation Studies as Topic
  • Female
  • Follow-Up Studies
  • Hip Joint / diagnostic imaging
  • Hip Prosthesis / instrumentation*
  • Hip Prosthesis / statistics & numerical data
  • Humans
  • Male
  • Middle Aged
  • Prosthesis Design
  • Prosthesis Failure
  • Radiography
  • Reoperation / statistics & numerical data