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A Biomechanical Comparison of 7‐Hole 3.5 mm Broad and 5‐Hole 4.5 mm Narrow Dynamic Compression Plates
Author(s) -
JOHNSTON SPENCER A.,
LANCASTER RONALD L.,
HUBBARD ROBERT P.,
PROBST CURTIS W.
Publication year - 1991
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.1991.tb01252.x
Subject(s) - cadaveric spasm , compression (physics) , bending , dynamic compression plate , medicine , orthodontics , rotation (mathematics) , fracture (geology) , stiffness , biomechanics , composite material , materials science , biomedical engineering , surgery , anatomy , internal fixation , geometry , mathematics
Seven‐hole 3.5 mm broad and 5‐hole 4.5 mm narrow dynamic compression plates were applied to paired canine cadaveric tibias in a stable fracture model. Paired tibias were tested to acute failure in rotation and four‐point bending, and to fatigue failure in four‐point bending. Resistance to screw pullout was measured for three 3.5 mm cortical screws and two 4.5 mm cortical screws inserted in the configurations of the bone plates. All plate‐bone systems failed by fracture of the bone through a screw hole. The 3.5 mm plate‐bone system was stronger in acute failure in rotation and in four‐point bending. There was no difference in stiffness, and no difference in the number of cycles to failure in fatigue testing. Three 3.5 mm screws had greater resistance to pullout than two 4.5 mm screws. Results indicate that the 7‐hole 3.5 mm broad dynamic compression plate has a biomechanical advantage over the 5‐hole 4.5 mm narrow dynamic compression plate.