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Measurement and judgment method for orthopedics diagnosis

A technology of orthopedics and femur, which is applied in the field of measurement and judgment of orthopedic diagnosis, can solve the problems of high medical cost, time-consuming test subjects, and simultaneous judgment of human bone density and hip joint looseness, etc.

Active Publication Date: 2012-05-09
QUANTA COMPUTER INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, traditionally, human bone density and hip joint looseness must be measured separately, and it is impossible to judge human bone density and hip joint looseness at the same time, so it is not only time-consuming for the subjects. , and the medical cost is relatively high

Method used

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  • Measurement and judgment method for orthopedics diagnosis
  • Measurement and judgment method for orthopedics diagnosis
  • Measurement and judgment method for orthopedics diagnosis

Examples

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no. 1 example

[0034] Because the proportion of the human body has a certain relationship, the circumference of a specific part of the human body is used to express the circumference of the femur, and the length between the two ends of the femur adjacent to the skin (the greater trochanter and the lateral upper malleolus) is measured to represent the length of the femur, combined with the aforementioned vibration source many times The resonance frequency measured by the low-frequency sweep is substituted into formula (1). Since vibration is difficult to estimate on irregular and heterogeneous objects, the inertia I is ignored, and after simplifying formula (1), formula (2) is obtained as follows:

[0035] EST BD=CL 2 f formula (2)

[0036] Among them, EST BD stands for bone density, C is the circumference of the wrist, L is the length of the femur, and f is the resonance frequency of the femur measured by the instrument. Comparing the EST BD measured by the instrument of this embodiment with the...

no. 2 example

[0039] Because body weight is directly related to bone weight, assuming that the area and density on a single length are the same, the body weight can be directly incorporated into formula (1), and after simplifying formula (1) and omitting the inertia I, the formula is obtained (3) As follows:

[0040] EST BD = f 2 w L 3 3 Formula (3)

[0041] Where EST BD stands for bone density, f is the resonance frequency of the femur measured by the instrument, w is the body weight, and L is the length of the femur. Compare the EST BD measured by the instrument of this embodiment with the BMD measured by the dual-energy X-ray absorption measurement method. figure 2 .

[0042] figure 2 Use this method of vibration source measurement and dual-energy X-ray absorption measurement method for the subject. The X axis is the EST BD obtained using this embodiment, and the Y axis is the BMD obtained using the dual-energy X-ray absorption measurement method. It can be seen...

no. 3 example

[0045] When measuring whether the hip joint is loose (the hip joint looseness referred to here mainly refers to the loosening of the artificial femoral ball head segment and the original femoral segment after replacement), the vibration source can also be used to input a fixed frequency low-frequency signal to Femur, and then observe whether there is obvious harmonic generation. If there is obvious harmonic generation, it means that the artificial femur end segment and the original femur segment may become loose.

[0046] In the choice of vibration frequency, because the resonance frequency of the femur is about 100Hz, and the resonance frequency of the soft tissue is not more than 50Hz, when the hip joint detachment test is performed, the input signal between 50Hz and 200Hz can be selected as the fundamental frequency, and Observe whether there are obvious harmonics between 50Hz and 200Hz. If the harmonic amplitude / fundamental frequency amplitude is greater than 50%, it means th...

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Abstract

A measurement and judgment method for orthopedics diagnosis comprises the steps of providing bone resonant frequency and bone length as well as a correction parameter of a testee, and setting the resonant frequency, the bone length and the correction parameter into a formula for calculation to obtain the bone density of the bone. The correction parameter can be of a circumference parameter or a weight parameter. In the method, whether artificial coax joints are loosened is judged better through comparing the input fundamental frequency amplitude with the generated harmonic amplitude.

Description

Technical field [0001] The invention relates to a method for measuring and judging orthopedic diagnosis, and in particular to a method for simultaneously measuring bone density and judging whether an artificial hip joint is loose. Background technique [0002] With the prosperous development of industry and economy, the average life expectancy of the people continues to increase and has a trend of increasing year by year. The pain caused by osteoporosis and degenerative arthritis is a big impact on the elderly. The problems caused by osteoporosis include low bone density, resulting in easy fracture and medical expenses. Degenerative arthritis can cause joint pain and damage, and artificial joint replacement must be performed in severe cases. [0003] When obtaining information on the bone density of the human body and whether the hip joint is loose or not, one of the methods is to use vibration as the signal input source, by transmitting the vibration wave to the skin surface of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00A61F2/76
Inventor 吴育民游志雄吴欣学王建胜谢宗闵黄书伟
Owner QUANTA COMPUTER INC
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