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The Development and Biomechanical Study of NiTi Shape Memory Alloy Amplectant Femur Prothesis of Stemless Hip Prosthesis

Author: SongXiaoFei
Tutor: LinYueQiu
School: Kunming Medical College
Course: Orthopedics
Keywords: Proximal femur Measuring Nitinol Biomechanics
CLC: R318.01
Type: Master's thesis
Year: 2009
Downloads: 34
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Abstract


Objective: encircling the upper femur anatomical parameters and the nitinol characteristics, combined with the biomechanical advantages of the sessile hip prosthesis, the design of a nickel-titanium shape memory alloy sessile hip femoral prosthesis (NiTi shape memory alloy amplectant femur prothesis of stemless hipprosthesis, NTAF-SHP), and its biomechanical testing, to provide the basis for clinical application. : Vernier caliper measurements of 24 adult patients with proximal femur anatomy parameters, and in accordance with the design of the measurement data and the proximal femur Features NTAF-SHP: 24 cases of femoral specimens divided into four groups, three groups were simulated vitro hip joint prosthesis arthroplasty load points for the experimental group (NTAF-SHP group), control group (handle hip prosthesis group), control group 2 (sessile hip group), another group of the normal group. Shimadzu AG-1 high-precision electronic universal material tester fixed intensity: each specimen 100N-1000N pressure is applied, the pressure displacement experiments, observed early after prosthetic replacement solid; paste the strain gauge connected static resistance strain gauges continue universal testing machine stress-strain experiments to observe the stress distribution in the case of the upper femur prosthetic replacement. Analysis of the experimental results to evaluate the biomechanical properties of NTAF-SHP. Results and Conclusions (1) In the 800Nf effect, the normal group compression load - displacement of 0.48 ± 0.02mm; the compression load of the control group 1 - displacement of 0.75 ± 0.01mm and the compression load of the control group 2 - displacement 0.88 ± 0.11mm; experimental group compressive load - displacement of 0.66 ± 0.02mm; displacement of the normal group was significantly less than the other three groups, statistically significant differences (P <0.01); displacement of the experimental group was significantly less than the control group and the control group 2, a statistically significant difference (P <0.05). The above results show that the new memory alloy handle encircling hip femoral prosthesis biological stability. (2) femoral implant the strain point measurements of three different artificial hip prosthesis status and stress analysis. The groups experiment results show that: 6,7,8,9 measuring point stress value Description the calcar and pressure trabecular bone is the main load-bearing structure of the upper femur. When three different prosthesis after implantation, the average of the upper femur stress generally manifested as decreased. The medial cortical bone of the the experimental group femur specimens under pressure stress greater than the control group and the control group, statistically significant differences (P <0.01). After the installation of the new memory alloy sessile encircling hip femoral prosthesis femoral stress distribution is closer to normal femur This is more in line with the design of the biomechanics.

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CLC: > Medicine, health > Basic Medical > Medical science in general > Biomedical Engineering > General issues > Biomechanics
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