Zusammenfassung
Hintergrund
Bis jetzt existiert lediglich eine publizierte Langzeitstudie (peer reviewed) aus der Inauguratoren-Klinik für den zementierten MS-30-Schaft.
Material und Methoden
In dieser retrospektiven „Multi-surgeon-Studie“ wurden die ersten 333 konsekutiven MS-30-Schäfte nachuntersucht. Alle Patienten mit 5–11 Jahren Follow-up wurden klinisch und radiologisch evaluiert. Zum Zeitpunkt der Implantation wurden die Kriterien der modernen Zementiertechniken nicht konsequent umgesetzt. Zur klinischen Evaluation dienten der Harris-Hip-Score (HHS) sowie der Score nach Merle d‘Aubigné u. Postel. In der radiologischen Auswertung wurden die Qualität des Zementmantels in 2 Ebenen, Prothesennachsinken, Lockerungszeichen und Osteolysen beurteilt.
Ergebnisse
Zum Zeitpunkt der Nachuntersuchung waren 12 Schäfte revidiert – 3 aufgrund aseptischer Lockerung, 6 wegen Infektionen, 1 nach periprothetischer Fraktur und 2 aufgrund rezidivierender Luxationen. Die Überlebensrate nach 10 Jahren unabhängig vom Revisionsgrund lag bei 96,1%, für aseptische Lockerungen bei 99,0%. Der mediane HHS lag bei 80 (26–100) Punkten. Die radiologische Analyse ergab in fast zwei Drittel der Fälle einen dünnen Zementmantel (<2 mm), der hauptsächlich in den lateralen Aufnahmen (Gruen-Zone 8/9) manifest wurde. Ein Drittel der Prothesen zeigten radiologische Risikozeichen für eine spätere Lockerung, die eng mit der initialen Qualität des Zementmantels korrelierten.
Schlussfolgerung
Die mittelfristigen Ergebnisse mit dem MS-30-Schaft sind ermutigend und sollten mit einer modernen Zementiertechnik weiter verbessert werden können.
Abstract
Introduction
So far there is only one peer-reviewed long-term publication from the inventors’ clinic for the MS-30 stem.
Material and methods
In a retrospective study we followed the first 333 consecutive MS-30 stems. All patients with 5- to 11-year follow-up were clinically and radiographically evaluated. At the time of implantation the criteria of modern cementing techniques were not implemented. Clinical evaluation was done using the scores of Harris and Merle d’Aubigné and Postel. Radiographic evaluation included quality of the cement mantle (true lateral radiographs taken under fluoroscopy), stem subsidence, loosening signs, and the risk for pending failure.
Results
At follow-up 12 hips had undergone femoral revision: 3 for aseptic loosening, 6 for infection, 1 for periprosthetic fracture, and 2 for recurrent dislocation. The overall survival for all reasons at 10 years was 96.1%; survival with aseptic loosening as an end point was 99.0%. The median Harris Hip Score at follow-up was 80 (26–100) points. Radiological evaluation revealed a thin cement mantle (<2 mm) in approximately 2/3, predominantly on the lateral views (Gruen zones 8/9). One-third of all reviewed prostheses were considered at risk for pending failure, which strongly correlated with the initial quality of the cement mantle.
Conclusion
Midterm results with the MS-30 stem are encouraging and an even better long-term outcome can be expected with a better cement technique.
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Clauss, M., Reitzel, T., Pritsch, M. et al. Der zementierte MS-30-Schaft. Orthopäde 35, 776–783 (2006). https://doi.org/10.1007/s00132-006-0956-4
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DOI: https://doi.org/10.1007/s00132-006-0956-4