Abstract
Background and objectives: Internal fixation is one of the most effective methods for the treatment of proximal femur fractures. The migration of implants after the operation can seriously affect the reduction of treatment and even cause complications. Traditional diagnosis methods can not directly measure the extent of displacement. Methods: Based on the analysis of Hansson pins, this paper proposes a measurement method based on three-dimensional matching, which uses computerized tomography (CT) images of different periods of patients after the operation to analyze the implants’ migration in three-dimensional space with the characteristics of fast speed and intuitive results. Results and conclusions: The measurement results show that the method proposed in this paper has more minor errors, more flexible coordinate system conversion, and more explicit displacement analysis than the traditional method of manually finding references in CT images and measuring displacement.
Highlights
Proximal femur fractures commonly occur worldwide, especially in the elderly [1].With increasing incidence, the number of patients is expected to double by 2025 compared to 1990 [2]
The models’ main directions in each group were the same and could be usedFdiigruecretly15foprrefisneentrsegthisetrdaattioanp.reprocessing results, and the 10 groups of models based on the computerized tomography (CT) images
The aim was to present a method based on point cloud matching for evaluating the stability of internal fixation implants in femur fractures during patient recovery
Summary
The number of patients is expected to double by 2025 compared to 1990 [2]. For treating Garden I and Garden II stable femoral neck fractures, the use of internal fixation has become a consensus among orthopedic surgeons [5,6,7]. Various options are currently available for stabilizing the internal fixation of femoral neck fractures, including cannulated screws, dynamic hip screws, proximal femoral locking plates, and other implants. Methods: Based on the analysis of Hansson pins, this paper proposes a measurement method based on three-dimensional matching, which uses computerized tomography (CT) images of different periods of patients after the operation to analyze the implants’ migration in three-dimensional space with the characteristics of fast speed and intuitive results. Results and conclusions: The measurement results show that the method proposed in this paper has more minor errors, more flexible coordinate system conversion, and more explicit displacement analysis than the traditional method of manually finding references in CT images and measuring displacement.
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