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Femoral neck bone density. Direct measurement and histomorphometric validation
N A Johanson1, M E Charlson, L Cutignola
1Department of Orthopedics, Temple University School of Medicine, Philadelphia, Pennsylvania.
The Journal of Arthroplasty
|December 1, 1993
Summary
This study developed direct bone density measurement methods for the femoral neck. Apparent density correlated best with bone concentration and may predict hip implant success.
Area of Science:
- Orthopedics
- Biomaterials Science
- Bone Physiology
Background:
- Assessing bone quality is crucial for predicting hip implant success.
- Current methods for measuring bone density in the femoral neck have limitations.
Purpose of the Study:
- To develop and validate a direct method for measuring bone density in femoral neck sections.
- To compare different bone density measurements (real, apparent, ash) and their correlation with histomorphometric and radiographic parameters.
Main Methods:
- Directly measured real, apparent, and ash bone densities in proximal and distal femoral neck cross-sections.
- Compared these measurements with histomorphometric analysis and the cortical index.
- Analyzed correlations between different density measures and between density and structural parameters.
Main Results:
- Strong correlation found between real and ash bone density (r = .93, P = .0001).
- Apparent density showed better correlation between proximal and distal sections (r = .76, P = .0001) than real or ash density.
- Apparent density moderately correlated with total bone area (r = .66, P = .008), suggesting it reflects bone concentration in space.
Conclusions:
- Direct measurement of apparent bone density in the femoral neck is a promising method.
- Apparent density may offer prognostic value for long-term hip implant fixation.
- Further research is needed to define bone quality parameters for implant success.