Abstract
In Revision-THR the great variability of acetabular defects requires a revision-cup-system, which enables the surgeon to treat even extensive unexspected bone losses with a load stable reconstruction during the surgery.
For these cases a modular revision support cup (MRS-Titan) has been developed. It allows the reconstruction of the geometric rotation centre and prevents the applied autologous or homologous bone graft in the healing phase from overlaoding. Beyond that an individual adjustment of the differently large flexible straps guarantees the solid anchoring of the revision support cup to the vital bone. The individual anatomy can be preserved in every case of acetabular destruction due to the high range of modularity the system provides. Because of the intraoperatively synthesis of all parts of the MRS-cup the approach and the traumatization of the soft tissue can be minimized.
Since 1995 we implanted 95 MRS-Titan-cups out of 250 which were implanted world wide. In all cases a stable anchoring of the implant has been reached. We will report about our own follow-up and complications. In 4 MRS revisions a revitalized acetabular bone graft has been found able to host a noncemented hemispherical cup in three cases.
Conclusion: The MRS-System is able to bridge mechanically stable damaged or missing parts of the acetabulum and allows immediate partial loading. A solid bone remodeling can be achieved. The costs could be minimized by reduction of store-keeping and simple but well considered instruments.
The abstracts were prepared by Nico Verdonschot. Correspondence should be addressed to him at Orthopaedic Research Laboratory, University Medical Centre, PO Box 9101, 6500 HB Nijmegen, The Netherlands.
