Biomechanical evaluation of fixation of comminuted olecranon fractures: one-third tubular versus locking compression plating.
BACKGROUND
New concepts in plate fixation have led to an evolution in plate design for olecranon fractures. The purpose of this study was to compare the stiffness and strength of locking compression plate (LCP) fixation to one-third tubular plate fixation in a cadaveric comminuted olecranon fracture model with a standardised osteotomy.


METHODS
Five matched pairs of cadaveric elbows were randomly assigned for fixation by either a contoured LCP combined with an intramedullary screw and unicortical locking screws or a one-third tubular plate combined with bicortical screws. Construct stiffness was measured by subjecting the specimens to cyclic loading while measuring gapping at the osteotomy site. Construct strength was measured by subjecting specimens to ramp load until failure.


RESULTS
There was no significant difference in fixation stiffness and strength between the two fixation methods. All failures consisted of failure of the bone and not of the hardware.


CONCLUSIONS
Contoured LCP and intramedullary screw fixation can be used as an alternative treatment method for comminuted olecranon fractures as its stiffness and strength were not significantly different from a conventional plating technique.
Buijze
Geert A
GA
Orthopaedic Research Center Amsterdam, Department of Orthopaedic Surgery, Academic Medical Center, Amsterdam, The Netherlands. G.A.Buijze@amc.uva.nl
Blankevoort
Leendert
L
Tuijthof
Gabriëlle J M
GJ
Sierevelt
Inger N
IN
Kloen
Peter
P
D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D001860:Bone Plates; D002102:Cadaver; D005260:Female; D005593:Fracture Fixation, Internal; D018460:Fractures, Comminuted / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D056740:Olecranon Process / Q000293:injuries* / Q000601:surgery*; D010027:Osteotomy; D014458:Ulna Fractures / Q000601:surgery*