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Predicting the failure load of the distal radius
Monique E Muller1, Colin E Webber, Mary L Bouxsein
1Department of Nuclear Medicine Hamilton Health Sciences McMaster Site, HSC-1P10, L8N 3Z5, Hamilton, Ontario, Canada.
Summary
Peripheral quantitative computed tomography (pQCT) best predicts distal radius fracture risk. Bone mineral content and geometry measures improve fracture prediction, with women showing higher wrist fracture risk than men.
Area of Science:
- Orthopedics
- Biomedical Engineering
- Radiology
Background:
- The distal radius is a common fracture site, necessitating accurate risk assessment.
- In vivo bone strength measurement is currently not feasible.
- Identifying reliable non-invasive methods to predict distal radius fracture is crucial.
Purpose of the Study:
- To determine which forearm bone assessment technique best predicts distal radius failure load.
- To compute a factor of risk for wrist fracture (Phi wrist).
- To evaluate the combined predictive power of bone density and geometry measures.
Main Methods:
- Thirty-eight cadaveric forearm specimens were analyzed.
- Five techniques assessed bone density, content, geometry, and structure: DXA, pQCT, DXR-BMD, and quantitative ultrasound.
- Failure load was determined by simulating a fall on an outstretched hand.
Main Results:
- pQCT measures (polar stress-strain index, cortical content) best predicted failure load (r2=0.82-0.85).
- Bone mineral content measures were superior predictors (r2=0.53-0.85) compared to density values (r2=0.22-0.69).
- Combining bone geometry with density improved prediction accuracy.
Conclusions:
- pQCT is a highly effective method for assessing distal radius fracture risk.
- Bone mineral content and geometry are critical factors in predicting failure load.
- Women in the study exhibited a higher wrist fracture risk compared to men.