Zusammenfassung
Hintergrund
Die Revision einer gelockerten und migrierten Pfannenkomponente mit Knochenverlust im Rahmen der Hüftendoprothetik stellt eine große chirurgische Herausforderung dar. Ziel sollte eine funktionell günstige Rekonstruktion des Rotationszentrums bei suffizienter, mechanischer Belastbarkeit des Acetabulums sein. Die diesbezüglich in Europa am häufigsten eingesetzten Revisionsimplantate sind die Müller-Abstützschale, die Hakendachschale nach Ganz, sowie der Burch-Schneider-Ring.
Patienten und Methoden
Wir berichten über unsere Erfahrungen mit diesen Implantaten bei 298 Patienten (298 Hüften) und einer medianen Nachuntersuchungszeit von 4 (0–17) Jahren im Rahmen einer retrospektiven Studie.
Ergebnisse
Von 224 Patienten (75%) konnten Nachuntersuchungsdaten erhoben werden. Hierbei wurde bei 176 Patienten (59%) eine radiologische Untersuchung durchgeführt. Weiterhin waren 54 Patienten (18%) verstorben, von 3 Patienten (1%) konnten keine Daten erhoben werden. Bei 18 Patienten (6%) wurde im Nachbeobachtungszeitraum eine erneute Revision durchgeführt, davon war in 9 Fällen die Ursache eine aseptische Lockerung, bei den übrigen 9 Fällen eine septische Lockerung. In 7 weiteren Fällen (2%) wurde im Rahmen der Nachuntersuchung ein radiologisches und klinisches Versagen des Implantats diagnostiziert. Die Überlebensrate nach 5 Jahren betrug 94% bzw. 89% nach 8 Jahren.
Schlussfolgerung
Die Revision mit Abstützschalen führt zu akzeptablen, mittelfristigen Ergebnissen. Hauptsorgenpunkte bilden die septischen Komplikationen sowie das lytische Versagen des Spongiosatransplantats mit konsekutiver Lockerung des Abstützrings.
Abstract
Background
Acetabular revision in total hip arthroplasty (THA), especially for loose or migrated cup components with collateral bone loss, remains a great surgical challenge. The aim should always be a functionally favorable reconstruction of the rotation center with sufficient load capacity of the acetabulum. Commonly used implants in Europe are the Mueller ring, the Ganz ring, and the Burch–Schneider cage.
Patients and Methods
We report our results of 298 patients (298 hips) with a median follow-up period of 4 (range 0–17) years in a retrospective series.
Results
Follow-up data were available in 224 cases (75%). A radiographic examination was performed in 176 (59%) patients. Another 54 patients (18%) had died in the follow-up period, while another three patients (1%) were lost to follow-up. Eighteen patients (16%) underwent re-revision, in nine cases for aseptic loosening and in the remaining nine cases for infection. In seven additional cases (2%), radiological and clinical failure was found during follow-up. The overall survival rate was 94% at 5 years and 89% at 8 years.
Conclusion
Revision THA using acetabular reinforcement rings results in acceptable midterm results. However, septic complications and lysis of the bone graft with consecutive failure of the reinforcement ring remain problematic.
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Dr. U.J. Schlegel ist Wissenschaftlicher Mitarbeiter an der Klinik und Poliklinik für Orthopädie.
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Schlegel, U., Bitsch, R., Pritsch, M. et al. Abstützschalen in der Revisionsendoprothetik der Hüfte. Orthopäde 37, 904–913 (2008). https://doi.org/10.1007/s00132-008-1314-5
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DOI: https://doi.org/10.1007/s00132-008-1314-5