Testing of prototype interference screw for ACL reconstruction in porcine femurs

Abstract

Multiple techniques for the reconstruction of anterior cruciate ligament (ACL) are available, most of which use implant made from metallic or bioabsorbable materials. Currently one of the most widely used fi xation methods for anterior cruciate ligament reconstruction with bone tendonbone graft is the interference screw. The aim of our work was to test custom design screw geometry, whether it is appropriate for ACL reconstruction. New screw was designed geometry for the work, so that screws with the same geometry could be produced for later work, from different materials. In this study injection molded biodegradable interference screws were tested on porcine femurs, with bone-patellar tendon-bone (BPTB) graft fi xation. The average failure load and the stiffness (772 ± 225 N and 109 ± 33.9 N/mm respectively) of the fi xation was higher than literature average, although within standard deviation. Test results showed that the designed screw geometry is adequate for BPTB graft fi xation.

Effect of crystalline forms (α′ and α) of poly(lactic acid) on its mechanical, thermo-mechanical, heat deflection temperature and creep properties

“…Due to its easy processability and reasonable price, PLA has already been commercialized and thus can be found on the market in most cases as the material of cups, cutleries, office utensils, flower pots, yoghurt cans, bottles (for still water), etc. It can also be physically or chemically foamed for loose-fill packaging [9], moreover, it has also already entered the medical industry as biocompatible and bio-absorbable implants [10][11][12] and by reinforcing it with various natural fibres like plant based cellulose [13][14][15][16] or mineral fibres [17,18], it may very likely have engineering applications as well.…”

In Vitro Investigation of the Fixation Performance of a Bioabsorbable Magnesium ACL Interference Screw Compared to a Conventional Interference Screw

“…For the biomechanical test, the tunnel size is suggested to be equal to or 1 mm larger than the diameter of the screw [ 14 , 15 , 22 ]. The testing bone material for the biomechanical test can be varied, for example, polyurethane block, bone biomechanical model, or cadaver [ 5 , 11 , 23 , 24 , 25 , 26 ]. The polyurethane foam block for biomechanical testing should match the material standard (ASTM F1839).…”

Comparison of thermal, mechanical and thermomechanical properties of poly(lactic acid) injection-molded into epoxy-based Rapid Prototyped (PolyJet) and conventional steel mold

“…Accordingly, there will be increasing number of attempts to injection mold biopolymers into rapid molds for producing prototypes with the same processing technology and same material than in future production supporting product design, product analysis especially for time dependent properties and future mass production of the given part. This injection molding into rapid mold technique can even be used to produce a small series of a unique product like biodegradable and at the same time bioabsorbable implants for instance for the medical industry (hard tissue repair) [7][8][9][10], since the geometry of these parts may highly vary in this field.…”