Scientific articleNumber and Locations of Screw Fixation for Volar Fixed-Angle Plating of Distal Radius Fractures: Biomechanical Study
Section snippets
Specimen
We selected 32 fresh-frozen cadaver radiuses (16 matched pairs) with no bony deformation and stripped the soft tissues from the bone. We performed x-rays of each bone. The specimens were obtained from the Anatomical Institute of our university; we obtained permission from the ethics commission. Specimens were stored at −20°C until needed for implantation and testing. The average age of the cadavers was 79.3 years of age (minimum, 61 years; maximum, 99 years). A total of 28 pairs were female and
Results
Bone mineral density was similar among the 4 groups. The median BMD of all groups was 197.7 ± 81.8 mgCaHA/mL.
With the numbers tested, there were no statistically significant differences among the 4 groups under dorsal and volar bending (Fig. 3). The mean stiffness under dorsal bending in group a was 59.33 ± 9.63 N/mm, and under volar bending 78.93 ± 16.33 N/mm. In group b the mean stiffness under dorsal bending was 49.93 ± 17.67 N/mm, and under volar bending 62.26 ± 33.58 N/mm; and in group c
Discussion
The purpose of the present study was to compare the biomechanical properties of 4 different configurations of screw placement in an extra-articular distal radius fracture model with one multidirectional angular stable plate system with 2 rows of distal fixation screw-holes. The loading conditions were axial compression and dorsal and volar bending. The biomechanical results demonstrated that by filling all screw holes in the distal fragment (7 locking screws), the highest stiffness under axial
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Cited by (0)
The authors thank Medartis for donating the plating systems tested.
The company Medartis provided the plating systems that were tested. No grants were received in support of this study.
No benefits in any form have been received or will be received related directly or indirectly to the subject of this article.