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DOI: 10.1055/s-2005-872473
© Georg Thieme Verlag Stuttgart · New York
Einpresskraft bei Press-fit Fixierung der vorderen Kreuzbandplastik - eine Grundlagenstudie
Axial Load in Case of Press-Fit Fixation of the ACL Graft - Basic SciencePublication History
Publication Date:
11 October 2005 (online)
Zusammenfassung
Studienziel: Bestimmung der erforderlichen Einpresskraft von glatten press-fit-Dübeln zur Befestigung der Patellasehnenplastik beim Ersatz des vorderen Kreuzbandes, um gleiche Befestigungseigenschaften zu erreichen wie bei der Interferenzschraubenfixierung. Methode: Studie an Rinderschienbeinköpfen mit 27 Patellasehnenplastiken, befestigt in tibialen Bohrlöchern, aufgeteilt in 3 Gruppen: Interferenzschraube, Passzylinderfixierung mit 150 N und mit 100 N. Vor der Befestigung Impaktierung des Transplantates in das Knochenbett. Testung bis zum Versagen in einer Zugmaschine mit einer Zuggeschwindigkeit von 50 mm/min. Bestimmung der Last bei Versagen und Steifigkeit. Ergebnisse: Bei 100 N und 150 N Einpresskraft des press-fit-Zylinders werden ähnliche Haltekräfte und Steifigkeiten erreicht wie bei der Interferenzschraubenfixierung. Maximalbelastung: 988,1 N ± 365,1 (Schraube) versus 1 210,4 N ± 292,4 (Dübel 150 N) und 1 109,8 N ± 505,4 (Dübel 100 N). Steifigkeit: 86,4 N/mm ± 20,5 (Schraube) versus 102,4 N/mm ± 15,2 (Dübel 150 N) und 77,1 N/mm ± 11,0 (Dübel 100 N). Es bestand kein signifikanter Unterschied. Schlussfolgerung: Bei der Einführung eines press-fit-Dübels (∅ 7 mm) mit 100 N axialer Kraft in ein präformiertes Knochenbett werden bei der Patellasehnendrittelplastik die gleichen Fixierungseigenschaften erreicht wie bei der Interferenzschraube.
Abstract
Aim: The aim of this study was the determination of the axial fixation load resting on smooth press-fit dowels needed for fixation of the patellar tendon graft (BTB) in order to reach the same fixation properties compared to the interference screw on anterior cruciate ligament (ACL) plasty. Method: Bovine test specimens with 27 BTB grafts fixed in tibial drill holes were used and divided in 3 groups: interference screw, and press-fit cylinder (Ø 7 mm) with 150 N and 100 N axial loads. Prior to fixation, impactation of the transplant into bone was carried out. Failure testing was done in a tensiometer at a cross-head speed of 50 mm/min. Determinations of peak load and stiffness were also made. Results: Similar peak loads and stiffness were reached on introducing a press-fit dowel (∅ 7 mm) with 100 N and 150 N axial load compared to interference screw fixation of the BTB graft. Peak load: 988.1 N ± 365.1 (screw) versus 1 210.4 N ± 292.4 (dowel 150 N) and 1 109.8 N ± 505.4 (dowel 100 N). Stiffness: 86.4 N/mm ± 20.5 (screw) versus 102.4 N/mm ± 15.2 (dowel 150 N) and 77.1 N/mm ± 11.0 (dowel 100 N). There was no significant difference. Conclusion: When introducing a press-fit dowel (∅ 7 mm) with 100 N axial load into a preformed bone bed, the same fixation properties are reached as in the case of an interference screw on BTB-ACL plasty.
Schlüsselwörter
vorderes Kreuzband - press-fit-Fixierung - Biomechanik - Fixierungseigenschaften - Rinderstudie
Key words
anterior cruciate ligament - press-fit fixation - biomechanics - fixation properties - bovine model
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