Edoardo Monaco1, Mattia Fabbri2, Riccardo Maria Lanzetti3, Andrea Del Duca4, Luca Labianca5, Andrea Ferretti6. 1. Orthopaedic Department and "Kirk Kilgour" Sports Injury Center, Sant' Andrea Hospital, "La Sapienza" University of Rome, Italy. Electronic address: edoardomonaco76@gmail.com. 2. Orthopaedic Department and "Kirk Kilgour" Sports Injury Center, Sant' Andrea Hospital, "La Sapienza" University of Rome, Italy. Electronic address: docmattiafabbri@gmail.com. 3. Orthopaedic Department and "Kirk Kilgour" Sports Injury Center, Sant' Andrea Hospital, "La Sapienza" University of Rome, Italy. Electronic address: riccardolanzetti@gmail.com. 4. Orthopaedic Department and "Kirk Kilgour" Sports Injury Center, Sant' Andrea Hospital, "La Sapienza" University of Rome, Italy. Electronic address: endrew@hotmail.it. 5. Orthopaedic Department and "Kirk Kilgour" Sports Injury Center, Sant' Andrea Hospital, "La Sapienza" University of Rome, Italy. Electronic address: luca.labianca@hotmail.com. 6. Orthopaedic Department and "Kirk Kilgour" Sports Injury Center, Sant' Andrea Hospital, "La Sapienza" University of Rome, Italy. Electronic address: aferretti51@virgilio.it.
Abstract
BACKGROUND: To compare in an animal model the biomechanical properties of four coupled fixation devices currently used in ACL reconstruction. Three out of four devices used a full tibial tunnel with an interference screw, while the other one system used a tibial socket and an adjustable loop suspension device. The null hypothesis is that there are no biomechanical differences between all the techniques tested. METHODS: Thirty two femur-graft-tibia complexes were mounted on a tensile machine using bovine digital extensor tendons, porcine knees and four different fixation device combinations: After a preconditioning with a tensile load of 90N for five minutes, 1000cycles between 0 and 150N were applied to the complex before the final pulled to failure. Stiffness and strength were evaluated at the final pullout, as was the displacement (slippage) at one, 100, 500, and 1000cycles. RESULTS: The multiple mean comparison led to a significant difference for the case of stiffness, with worse results in group C compared to group A (p=0.037). Conversely, no differences were found in UFL and slippage between all groups (p>0.05). CONCLUSION: All the tested systems demonstrated in an animal model sufficient properties for a safe postoperative rehabilitation both for strength and for stiffness and slippage under cyclic loading.
BACKGROUND: To compare in an animal model the biomechanical properties of four coupled fixation devices currently used in ACL reconstruction. Three out of four devices used a full tibial tunnel with an interference screw, while the other one system used a tibial socket and an adjustable loop suspension device. The null hypothesis is that there are no biomechanical differences between all the techniques tested. METHODS: Thirty two femur-graft-tibia complexes were mounted on a tensile machine using bovine digital extensor tendons, porcine knees and four different fixation device combinations: After a preconditioning with a tensile load of 90N for five minutes, 1000cycles between 0 and 150N were applied to the complex before the final pulled to failure. Stiffness and strength were evaluated at the final pullout, as was the displacement (slippage) at one, 100, 500, and 1000cycles. RESULTS: The multiple mean comparison led to a significant difference for the case of stiffness, with worse results in group C compared to group A (p=0.037). Conversely, no differences were found in UFL and slippage between all groups (p>0.05). CONCLUSION: All the tested systems demonstrated in an animal model sufficient properties for a safe postoperative rehabilitation both for strength and for stiffness and slippage under cyclic loading.
Authors: J Glasbrenner; C Domnick; M J Raschke; T Willinghöfer; C Kittl; P Michel; D Wähnert; Mirco Herbort Journal: Knee Surg Sports Traumatol Arthrosc Date: 2018-10-27 Impact factor: 4.342
Authors: Patrick A Smith; Marina Piepenbrink; Shelby K Smith; Samuel Bachmaier; Asheesh Bedi; Coen A Wijdicks Journal: Orthop J Sports Med Date: 2018-04-24
Authors: Samuel Whitaker; Jennifer H Edwards; Stephen Guy; Eileen Ingham; Anthony Herbert Journal: Bone Joint Res Date: 2019-12-03 Impact factor: 5.853
Authors: Samuel Bachmaier; Gregory S DiFelice; Bertrand Sonnery-Cottet; Wiemi A Douoguih; Patrick A Smith; Lee J Pace; Daniel Ritter; Coen A Wijdicks Journal: Orthop J Sports Med Date: 2020-01-29