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- W2896738471 abstract "Background: The objective of this study was to determine the impact of the type and orientation of peripheral screw placement in an eccentrically positioned locking plate on the structural integrity of the plate-diaphyseal bone interface. We hypothesized that central placement of the screw at the end of the plate in this setting is more important than screw type (locking versus nonlocking) to limiting the risk of subsequent fracture. Methods: Twenty osteoporotic fourth-generation composite left humeri were divided into 4 groups and plated with stainless-steel 6-hole locking plates and 4.5-mm screws. Group 1 (control group) consisted of a centrally positioned plate with a centrally placed non-locking end screw at the sixth, most-proximal hole. Group 2 consisted of an eccentrically positioned plate with a non-locking proximal end screw placed through the center of the bone. Group 3 consisted of an eccentrically positioned plate with a locking proximal end screw placed perpendicular to the plate and eccentrically across the cortex. Group 4 consisted of an eccentrically positioned plate with a non-locking proximal end screw placed perpendicular to the plate and eccentrically across the cortex. Each group was tested with a single load to failure in torsion at a rate of 1°/second. Results: The control group (Group 1) failed at significantly higher peak torque values (51.62 ± 7.35 Nm) than Group 2 (38.98 ± 6.78 Nm; p = 0.006), Group 3 (34.75 ± 1.81 Nm; p < 0.001), and Group 4 (31.55 ± 1.23 Nm; p < 0.001). Failure energy absorbed in Group 1 (2,591.49 ± 819.63 Nm/degree) was significantly higher than Group 3 (1,430.51 ± 449.99 Nm/degree; p = 0.04) and Group 4 (952.49 ± 123.52 Nm/degree; p = 0.004), but not significantly higher than Group 2 (1,847.73 ± 827.35 Nm/degree; p = 0.27). Conclusions: Eccentrically placed plating of humeral shaft fractures significantly increases the risk of peri-implant fracture compared with a centrally placed plate. Directing the proximal-end screw centrally in an eccentrically placed plate may help to mitigate this risk at the proximal end. Clinical Relevance: When possible, care should be taken to place the plate centrally on the bone to avoid increased risk of peri-implant fracture at the proximal plate-bone interface." @default.
- W2896738471 created "2018-10-26" @default.
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- W2896738471 date "2018-10-17" @default.
- W2896738471 modified "2023-09-26" @default.
- W2896738471 title "The Impact of Eccentric Diaphyseal Plate and Screw Placement on the Risk of Peri-Implant Fracture" @default.
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- W2896738471 doi "https://doi.org/10.2106/jbjs.18.00024" @default.
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