A Bone Structure Prediction Method Applicable to Dynamic-Static Coupled Loads

Abstract

The invention discloses a bone structure prediction method suitable for dynamic and static coupled loads, comprising: Step 1: determining the topological range of the bone structure to be predicted, and distinguishing solid bone areas and intraosseous liquid fluid areas; Step 2: The bone structure is modeled, the solid domain and the fluid domain are modeled separately, and then assembled; Step 3: Carry out finite element mesh division on the established bone structure model to obtain the bone structure finite element mesh model; Step 4: Define the bone structure separately The material performance parameters of the structural solid bone and fluid; step five: load the mechanical boundary conditions and loads on the finite element mesh model of the bone structure; step six: perform finite element analysis on the bone structure; this method realizes the solid bone in the bone tissue The regulatory effects of the two mechanical signals of mass static load mechanical stimulation and hydrodynamic mechanical stimulation are basically consistent with the physiological mechanism of mechanical stimulation in bone reconstruction physiological observations, and the prediction results are more accurate.

Description

technical field [0001] The invention relates to a bone structure prediction method, in particular to a bone structure prediction method suitable for dynamic and static coupled loads. Background technique [0002] Bone structure prediction (also known as numerical simulation of bone remodeling) is an important method for studying bone remodeling theory. It provides a theoretical basis for clinically predicting changes in bone density or optimal design of prostheses, and is also helpful for the research of various bone metabolic diseases and new Proposal of treatment options for bone metabolic diseases. Bone has mechanical functions such as support, movement, and protection, and bears very complex loads, including static loads dominated by support functions, dynamic loads dominated by movement functions, and fluid circulation in the body. Bone tissue is a porous structure with fluid in the internal spaces. Solid bone has the ability of mechanical adaptability, that is, the p...

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Problems solved by technology

(Refer to: Lei Zhou Jixin, Wang Dongmei, Wang Chunhui, et al. Effects of different mechanical excitations on numerical simulation of bone remodeling [J]. Medical Biomechanics, 2015, 30(4): 299-303.) There are some existing bone structure prediction methods. Problems and shortcomings: First, when performing an abstract mechanical model of bone structure, the liquid existing inside the bone tissue is ignored, and the bone tissue is regarded as a solid elastic material with different density distribution, which is inconsistent with the fluid-solid two-phase structure of bone tissue; The mechanical stimulation uses the strain energy density of solid bone, Mises equivalent stress or Mises equivalent strain, which are different from the physiological mechanism of the actual mechanical stimulation of bone reconstruction.

Therefore, there is a large deviation between the current bone structure prediction algorithm and the actual physiological activity of bone reconstruction.

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