Depth-specific characterization of bone microarchitecture in the femoral head: implications for osteoarthritis and osteoporosis research
Authors' conclusion
Our findings showcase spatially distinct contributions of cartilage degeneration and systemic skeletal status to subchondral bone remodeling, identifying depth as a critical determinant in the analysis of osteochondral alterations in hip OA. Specifically, our findings emphasize that systemic BMD should be considered a covariate in OA research and that deep regions of the femoral head should be used for OP research to minimize potential confounding by local OA-related effects.
Study context
- Population
- Patients undergoing primary total hip arthroplasty for hip osteoarthritis (OA)patients whose femoral heads were obtained
- Participants
- 30 patients
- Outcome
- Depth profile of Tb.vTMD, BV/TV and Tb.Th
Methodological detailscomputational segmentation of the subchondral mineralized plate (SMP) and five concentric trabecular regions, histologically assessed cartilage degeneration, systemic bone mineral density (BMD) measured by dual-energy X-ray absorptiometry (DXA)
- Computational segmentation of the subchondral mineralized plate (SMP) and five concentric trabecular regions
- Histologically assessed cartilage degeneration
- Systemic BMD measured by dual-energy X-ray absorptiometry (DXA)
Main finding
As reported in the abstract
- Initial decrease in the superficial trabecular regions, followed by a progressive increase toward deeper regions
Further findings
Cyst-like void volume by depth
- Continuously decreased with depth and almost completely disappeared beyond depth (mm)
- 9.84 mm
Cartilage degeneration as predictor of subchondral bone microstructure
- Independently predicted subchondral bone microstructure within the SMP and in superficial to intermediate trabecular regions, up to depth
- 13.12 mm
- Higher OARSI grades were associated with higher SMP.Th, Tb.vTMD, BV/TV, and Tb.Th
- Cartilage degeneration was not associated with trabecular bone parameters in the deepest trabecular region
Systemic BMD T-score as predictor of trabecular bone parameters
- Independent predictor of trabecular bone parameters across all depths
- Sole determinant of BV/TV and Tb.Th in the deepest trabecular region (beyond 13.12 mm depth)
Cohort characteristics
- Mean age (years)
- 75.4 ± 9.5
- Female
- 53.3%
- Normal BMD
- 36.7%
- Osteopenia
- 46.7%
- Osteoporosis
- 16.7%
Original publication
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