Biomechanical evaluation of a bioabsorbable expansion bolt for hamstring graft fixation in ACL reconstruction: an experimental study in calf tibial bone

Autor: W. Plitz, L. Meyer, P. Strunk, G. Lob, R. Dieckmann, S. Piltz
Rok vydání: 2005
Předmět:
Zdroj: Archives of Orthopaedic and Trauma Surgery. 125:577-584
ISSN: 1434-3916
0936-8051
DOI: 10.1007/s00402-005-0007-3
Popis: Introduction: The purpose of our study was to evaluate and compare the primary fixation strength of a novel bioabsorbable two shell expansion bolt (EB) with that of a well-established interference screw-fixation technique in hamstring reconstruction of the anterior cruciate ligament. Materials and methods: Thirty calf tibia plateaus (age 5–6 months) were assigned to three groups: In group I (n=10) triple-stranded hamstring grafts were fixed with titanium interference screws (7 mm thread / 8 mm head × 25 mm). Specimens of group II (n=10) received bioabsorbable poly-L-lactide interference screws (8×23 mm). In group III (n=10), the grafts were fixed using bioabsorbable poly-D,L-lactide expansion bolts (5.8/8.5/10 mm × 35 mm). The tensile axis was placed parallel to the bone tunnel. The construction was then loaded until failure under a displacement rate of 1 mm per second. Results: There were no significant differences concerning the maximum pullout force (group I: 357 N ± 61; group II: 326 N ± 92; group III: 343 N ± 55). In case of the expansion bolt, we found the stiffness to be higher (61 N/mm) when compared to group I (48 N/mm), and group II (52 N/mm) (P
Databáze: OpenAIRE
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