Summary
A high incidence of acetabular loosening following total hip arthroplasty is emerging as long term follow-up studies become available. The Müller and Burch-Schneider acetabular supports are indicated for acetabular deficiencies which are frequently present during revision hip arthroplasty. The Burch-Schneider support is indicated where the deficiences are of such magnitude that the Müller ring does not have stable seating prior to screw fixation. These devices bring the resultant of forces across the hip joint under the acetabular roof and provide metal backing for the acetabular cup. They have the additional advantage of screw fixation which in the Müller ring is in line with the resultant of forces across the hip joint. In a one to three year follow-up of twenty-five hip replacements in twenty-four patients, the Müller support ring was used in twenty hips and the Burch-Schneider in five hips. The results were satisfactory and indicate that these supports are valuable in the treatment of patients with acetabular deficiencies.
Zusammenfassung
Ein häufiges Vorkommen von Pfannenlockerungen bei Hüftgelenk-Totalprothesen wird erkennbar, seitdem Langzeitbeobachtungen zur Verfügung stehen. Die Pfannen-Verstärkungsringe von Müller und Burch-Schneider sind indiziert bei mangelhaften Verankerungsbedingungen im Acetabulum, wie sie bei Prothesenauswechslungen häufig vorkommen. Der Burch-Schneider-Verstärkungsring ist angezeigt, wenn die Schädigung des Acetabulums so hochgradig ist, daß der Müller-Ring vor der Verschraubung keinen festen Halt findet. Diese Verschraubungsringe lenken die auf das Hüftgelenk einwirkenden Kräfte unter das Pfannendach und geben außerdem der Prothesenpfanne eine Metallverstärkung. Sie haben den zusätzlichen Vorteil der Schraubenfixation, wobei bei dem Müller-Ring die Schrauben in der Richtung der resultierenden Kräfte verlaufen, die auf das Hüftgelenk einwirken. In einer einbis dreijährigen Verlaufsuntersuchung von 25 Hüftgelenkprothesen bei 24 Patienten wurde der Verankerungsring von Müller bei 20 Hüften und der von Burch-Schneider bei 5 Hüften verwendet. Die Ergebnisse waren zufriedenstellend und zeigen, daß diese Verstärkungsringe bei mangelhaften Verankerungsbedingungen im Acetabulum wertvoll sind.
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Schatzker, J., Glynn, M.K. & Ritter, D. A preliminary review of the Müller acetabular and Burch-Schneider antiprotrusio support rings. Arch. Orth. Traum. Surg. 103, 5–12 (1984). https://doi.org/10.1007/BF00451312
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DOI: https://doi.org/10.1007/BF00451312