Bone load detection method based on six-axis parallel external bone fixation device

Abstract

The invention discloses a fracture rehabilitation evaluation method based on a six-axis parallel external bone fixation device, which mainly comprises the following steps: adding a sensor to each branch chain of a prior six-axis parallel external bone fixation device, and restoring and fixing the fracture using a modified device; using a marker, wherein the space positions and postures of the fracture bone blocks and external bone fixation device are identified through the medical CT scanning; dividing the rehabilitation process into a first time period and a second period according to a clinical general rehabilitation phase dividing method, wherein, when a patient is in the first time period, the mechanical condition of the fracture part is measured and analyzed, and the external bone fixation device is finely adjusted and the patient is guided to carry out rehabilitation training; when the patient is in the second time period, the quantitative index of the fracture recovery is calculated, and the external bone fixation device is removed at appropriate timing. The method is suitable for all kinds of commercially available six-axis parallel external bone fixation devices, and haseconomy and convenience; according to the method, the quantitative evaluation of fracture rehabilitation is carried out by using an energy analysis method, and the reliability is good.

Description

technical field [0001] The invention relates to the technical field of orthopedic external fixation, in particular to a method for refitting an existing six-axis parallel bone external fixation device for long-term detection of the load bearing status of bones. Background technique [0002] Orthopedic external fixation technology is an orthopedic surgical treatment that uses a six-axis parallel external fixation device to fix the broken end of the fracture and provides a suitable mechanical environment for fracture healing. Patents US6030386, US8439914 and WO2011163406 propose a type of six-axis parallel external bone fixation device, which is composed of six branch chains with identical topological structures and two fixation rings. Doctors use metal bone pins to fix the two fixation rings to the bone fragments at both ends of the patient's fracture; six branch chains are connected to the two fixation rings through hinges at both ends. Adjusting the length of the six branc...

AI Technical Summary

Problems solved by technology

These methods of quantitative evaluation of fracture rehabilitation status mainly have the following problems: (1) It is necessary to remove the original six-axis parallel external fixation device and install special testing equipment, which is not economical and convenient, and when the bracket is removed, it may cause secondary damage. (2) The evaluation method based on bone load measurement uses a relatively rough axial loading model and average force calculation method, and the accuracy of the measurement results needs to be improved; (3) The evaluation method based on callus stiffness estimation is not very sensitive, It is necessary to apply a large load to the fracture site to detect the amount of deformation and estimate the stiffness of the callus, but excessive load is not conducive to the recovery of the fracture, and severe cases may cause secondary fractures

The above problems make it difficult to apply quantitative evaluation methods of fracture rehabilitation status in clinical practice.

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