Abstract
Roof reinforcement and reconstruction rings have facilitated bone restoration in revision arthroplasty of the acetabulum. These rings are used when there is not enough bone to support a conventional cemented or a standard sized or jumbo uncemented cup. Both rings may be used with morselised or structural allograft bone. Roof reinforcement rings are used for contained defects but contact must be made with host bone superiorly and infero-medially. For more global contained defects where most of the acetabulum is filled with morselised allograft bone, contact with host acetabulum infero-medially is impossible. Under these circumstances a reconstruction ring that extends from ilium to ischium must be used.
Uncontained (segmental) bone defects reconstructed with structural allografts are bridged and protected by reconstruction rings that extend from ilium to ischium.
In 43 acetabular revisions, roof reinforcement rings were used with morselised allograft bone for contained defects. At five years average follow-up the survivorship was 88% (one re-revision and four definitely loose).
In 13 patients with massive uncontained acetabular defects, reconstruction rings were used in conjunction with structural allografts. At an average follow-up of 10.5 years, the survivorship was 77% (10 hips have not been re-revised and have a stable implant).
The abstracts were prepared by Mrs Dorothy L. Granchi, Course Coordinator. Correspondence should be addressed to her at PMB 295, 8000 Plaza Boulevard, Mentor, Ohio 44060, USA.
