Kurzfassung

Objectives: The purpose of this biomechanical study was to determine whether a multidirectional angle stable plate with locking screws or with locking pegs in the distal fragment would optimize fixation of AO/OTA A3 distal radius fractures.
Methods: 8 pairs of fresh-frozen human distal radii were used. Extra-articular distal radius fractures were created and stabilized with a multidirectional volar angle stable plate. The radii were randomized into 2 matched-paired groups. The distal fragment...Objectives: The purpose of this biomechanical study was to determine whether a multidirectional angle stable plate with locking screws or with locking pegs in the distal fragment would optimize fixation of AO/OTA A3 distal radius fractures.
Methods: 8 pairs of fresh-frozen human distal radii were used. Extra-articular distal radius fractures were created and stabilized with a multidirectional volar angle stable plate. The radii were randomized into 2 matched-paired groups. The distal fragment in group I was stabilized with 7 locking screws. The distal fragment in group II was fixed with 7 locking pegs. The proximal fragment in both groups was fixed with 3 screws. The specimens were tested under torsion and axial compression during static and cyclic tests. Finally load to failure tests under torsion were performed.
Results: 99% of the torsional stiffness after 1000 cycles remained in the group using screws whereas only 76% of the stiffness under torsion remained in the group using pegs. Under axial compression stiffness remained at 90% in the group using screws after 1000 cycles, whereas in the groups using pegs the median stiffness was 0%. This was statistically significant both under torsional and axial compression.
Conclusions: This biomechanical study showed a statistically significant difference between the locking screw and locking smooth peg configuration concerning the stiffness of the constructs after 1000 cycles. The use of locking screws as opposed to smooth locking pegs for AO A3 extra-articular distal radius fractures optimizes construct stability. » weiterlesen» einklappen