Key Takeaways & Executive Findings
- •• Principal compressive trabeculae exhibit a functionally graded porous structure, with region 5 showing the highest bone volume fraction, trabecular thickness, and grayscale value. • Principal tensile trabeculae show region 3 with the highest bone volume fraction, trabecular thickness, trabecular number, and grayscale value, while region 2 has the lowest. • A reliable method for extracting the volume of interest of principal stress trabeculae was proposed, enabling detailed morphometric analysis. • The findings provide new insights into the microstructural anatomy of principal stress trabeculae, potentially informing the design of novel bionic hip prostheses.
Abstract
BACKGROUND: The principal compressive and tensile trabecular bones in the proximal femur are essential structures responsible for transmitting forces through the hip joint. Given their complex and heterogeneous composition, exploring their microstructural variations will help improve our understanding of principal stress trabeculae. OBJECTIVE: To extract trabecular microstructural information from various regions of femoral head specimens and study their morphometric patterns, elucidate the microstructural variations of principal stress trabeculae, and provide a theoretical basis for the design of future bionic hip prostheses. METHODS: Totally 11 fresh femoral heads were obtained from patients with femoral neck fractures. They were scanned by Micro-CT and reconstructed by image analysis software (InveonTM Acquisition Workplace). The principal compressive and tensile trabecular bones were segmented into five regions respectively. After selecting the volumes of interest for each region, morphometric analyses were subsequently performed on bone volume fraction, bone surface area fraction, trabecular thickness, trabecular number, trabecular spacing, trabecular pattern factor, and grayscale value. RESULTS AND CONCLUSION: (1) Among the principal compressive trabeculae, Region 5 exhibited the highest bone volume fraction, trabecular thickness, and grayscale value, followed by Region 4 and 1, with statistically significant differences between Region 5 and 1 (all P < 0.05). Moving from Region 3 to Region 2, 1, and Regions 4, 5, there was a decreasing trend in bone surface area fraction and trabecular number, accompanied by an increasing trend in trabecular thickness. (2) Among the principal tensile trabeculae, Region 3 displayed the highest values for bone volume fraction, trabecular thickness, trabecular number, and grayscale value, while Region 2 showed opposite trends, with statistically significant differences between the two regions, (excluding grayscale value; all P < 0.001). (3) This study proposes a reliable method for extracting the volume of interest of principal stress trabeculae, and for the first time proposes the theory that principal compressive trabeculae are a functionally graded porous structure, providing new insights into the microstructural anatomy of principal compressive trabeculae and potentially proving useful for the design of novel bionic hip prostheses.
1. Introduction
The human proximal femur exhibits a distinct internal structure, most notably two trabecular columns that are clearly visible on anteroposterior radiographs of the hip joint (Figure 1). The vertical trabeculae originate from the inferior medial aspect of the femoral neck, ascend vertically to the femoral head, and terminate near the subchondral bone. The horizontal trabeculae traverse the femoral head, intersecting the vertical trabeculae at approximately right angles [1]. The formation of these two trabecular columns is closely related to the mechanical function of the femur, attracting considerable research interest, most notably from Wolff [2], leading to two theories: (1) the trajectorial theory, which primarily concerns the transmission of forces through the cancellous bone of the proximal femur, with the vertical trabeculae (principal compressive trabeculae) mainly transmitting compressive loads and the horizontal trabeculae (principal tensile trabeculae) mainly transmitting tensile loads; and (2) Wolff's theory of bone formation, which describes the response of bone to forces. Although these concepts remain debated, they have been widely accepted and used in simulation studies [3-5].
Understanding the microstructural variations of these principal stress trabeculae is crucial for comprehending the biomechanics of the hip joint and for designing biomimetic implants. This study aims to extract trabecular microstructural information from various regions of femoral head specimens and to analyze their morphometric patterns, thereby elucidating the microstructural changes of principal stress trabeculae and providing a theoretical basis for the design of future bionic hip prostheses.
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Cao Meng, Li Lun, Tian Simiao, Cao Fang, Song Liqun, Zhao Dewei (2026). Morphometric analysis of principal stress trabeculae in the proximal femur. Chinese Journal of Tissue Engineering Research. https://doi.org/10.12307/2026.21404
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Frequently Asked Questions
What is the main finding of this study?
The study reveals that the principal compressive trabeculae in the proximal femur exhibit a functionally graded porous structure, with regional variations in bone volume fraction, trabecular thickness, and other morphometric parameters. This provides new insights into the microstructural anatomy of these trabeculae and may inform the design of novel bionic hip prostheses.
How were the trabecular regions analyzed?
Fresh femoral heads from 11 patients with femoral neck fractures were scanned using Micro-CT and reconstructed with image analysis software. The principal compressive and tensile trabeculae were each divided into five regions, and volumes of interest were selected for morphometric analysis, including bone volume fraction, bone surface area fraction, trabecular thickness, trabecular number, trabecular spacing, trabecular pattern factor, and grayscale value.
What are the key differences between the principal compressive and tensile trabeculae?
The principal compressive trabeculae showed the highest bone volume fraction, trabecular thickness, and grayscale value in region 5, while the principal tensile trabeculae had the highest values in region 3. The study also found significant regional variations within each type, indicating distinct structural adaptations to mechanical loading.
Why is this research important for hip prosthesis design?
By understanding the functionally graded porous structure of the principal stress trabeculae, designers can create hip prostheses that better mimic the natural biomechanics and microstructure of the proximal femur, potentially improving implant integration and longevity.
What is the clinical significance of this study?
The findings enhance our understanding of the microstructural anatomy of the proximal femur, which is essential for diagnosing and treating conditions such as osteoporosis and for planning surgical interventions. Additionally, the proposed method for extracting volumes of interest can be applied in future studies of bone microstructure.
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