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DOI: 10.1055/s-0038-1633079
Holding Strength of 4.5 mm Cortical Screws in Polymethylmethacrylate Filled Medullary Cavities of Canine Bone
Publikationsverlauf
Received for publication:
31. Dezember 1991
Publikationsdatum:
06. Februar 2018 (online)
Summary
The technique of adding polymethylmethacrylate (PMMA) to the medullary cavities of canine bone significantly increases the screw pullout resistance by 3.6 times over bone without PMMA. This increased holding power per screw would be advantageous when due to the fracture configuration, a minimum number of screws must be used on one or both fracture sides. This would help resist bone shear loosening at the screw/ bone interface by adding the additional pullout strength of the PMMA. Each mm of PMMA filling the medullary cavity is equivalent to adding the pullout strength of an additional 1.0 mm of cortical bone (310.0 N/ mm).
Paired femurs were used to evaluate the in vitro mechanical advantages of the holding strength of 4.5 mm orthopaedic bone screws on adult canine bone, with and without the medullary cavity filled with polymethylmethacrylate (PMMA). Maximum cortical screw pullout force and holding strength were significantly greater for bones with the medullary cavity filled with PMMA than for bones without PMMA. Holding strength of PMMA was not different from the holding strength per mm of bone.
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