Medicine Meets Engineering Proceedings of the 2nd Conference on Applied Biomechanics Regensburg
Proximal femur fractures are of main concern for elderly and especially osteoporotic patients. Despite advanced implant modifications and surgical techniques, serious mechanical complication rates between 4 - 18% are found in conventional osteosyntheses of proximal femur fractures. Clinical compl...
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| Những tác giả chính: | , , |
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| Định dạng: | Sách |
| Ngôn ngữ: | English |
| Được phát hành: |
IOS Press
2013
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| Những chủ đề: | |
| Truy cập trực tuyến: | http://scholar.dlu.edu.vn/thuvienso/handle/DLU123456789/35209 |
| Các nhãn: |
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| Thư viện lưu trữ: | Thư viện Trường Đại học Đà Lạt |
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| Tóm tắt: | Proximal femur fractures are of main concern for elderly and especially
osteoporotic patients. Despite advanced implant modifications and surgical techniques,
serious mechanical complication rates between 4 - 18% are found in conventional
osteosyntheses of proximal femur fractures. Clinical complications such
as the rotation of the femoral head and the cut-out phenomenon of the fracture fixation
bolt are often diagnosed during post-operative treatments. Therefore, efforts
in new intramedulary techniques focus on the load bearing characteristics of the
implant by developing new geometries to improve the implant-tissue interface. The
objective of this investigation was to analyse the osteosynthesis/femur head interaction
of two commonly used osteosyntheses, one with a helical blade and the other
one with a screw design under different loading conditions.
For the comparative investigation the helical blade of the Proximal Femur Nail
Antirotation was investigated versus the screw system of the Dynamic Hip Screw.
After implantation in a femoral head the loads for rotational overwinding of the
implants were analysed. Pull-out forces with suppressed rotation were investigated
with analysis of the influence of the previous overwinding. All investigations were
performed on human femoral heads taken of patients with average age of 70.3 ±
11.8. The bone mineral densities of the human specimens were detected by QCTscans
(average BMD: 338.9 ± 61.3 mg
cm3 ). Prior to cadaveric testing the experimental
set-up was validated and special influences were analysed by the use of synthetic
foam blocks (Sawbone). The helical blade showed a significant higher torque for
the rotation of the femoral head compared to the screw system. The pull-out forces
of the blade were substantially lower than of the comparative screw.
Taken together the helical blade showed a higher potential of rotational stability,
but after a rotation the lower pull-out forces demonstrate a higher degree of damage
to the femoral head. |
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