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Title: Does thread shape affect the fixation strength of the bioabsorbable interference screws for anterior cruciate ligament reconstructions? A biomechanical study
Authors: Garcés, Gerardo L. 
Martel, Oscar 
Yánez, Alejandro 
Cuadrado, Alberto 
UNESCO Clasification: 3314 Tecnología médica
Keywords: Anterior cruciate ligament
ACL reconstruction
Interference screw
Biomechanical testing
Issue Date: 2019
Journal: BMC Musculoskeletal Disorders 
Abstract: Background: The purpose of this study was to compare the biomechanical behaviour of two bioabsorbable interference screws with different geometries. Methods: Two different pitch (2.5 and 5 mm) bioabsorbable interference screws, both 9 × 30 mm, were tested. Tests were performed with forty bovine digital extensor tendons and skeletally mature porcine tibiae. Two protocols of cyclic tests at 1 Hz were performed: 1000 cycles from 50 to 250 N, and 5000 cycles from 100 to 300 N (n = 10 for each type of test and screw). After the cyclic loading, a final ramp displacement until failure at 0.5 mm/s was applied. Results: The stiffness after the cyclic phase of the tests was not statistically different between the two screws (1000th cycle: 2.5 mm pitch 280.3 ± 56.4 N/mm, 5 mm pitch 275.2 ± 65.0 N/mm, P = .965; 5000th cycle: 2.5 mm pitch 281.3 ± 66.4 N/mm, 5 mm pitch 286.1 ± 79.4 N/mm, P = .814). The yield load was not significantly different between the screws (1000 cycle tests: 2.5 mm pitch 482.2 ± 120.2 N, 5 mm pitch 495.9 ± 131.3 N, P = .508; 5000 cycle tests: 2.5 mm pitch 476.4 ± 65.3 N, 5 mm pitch 494.3 ± 39.2 N, P = .391). No correlation was found between the insertion torque and yield load (1000 cycle tests, R2 = 0.013; 5000 cycle tests, R2 = 0.006). Conclusions: The pitch of bioabsorbable interference screws does not seem to affect fixation strength. Also, the authors recommend not to use insertion torque alone to estimate the fixation strength.
ISSN: 1471-2474
DOI: 10.1186/s12891-019-2435-1
Source: BMC Musculoskeletal Disorders [ISSN 1471-2474], v. 20 (1):60
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