Cancellous bone volume and structure in the forearm: noninvasive assessment with MR microimaging and image processing

Area of Science:

• Biomedical Imaging
• Osteoporosis Research
• Bone Densitometry

Background:

• Osteoporosis poses a significant fracture risk, particularly vertebral fractures.
• Accurate assessment of bone health is crucial for fracture risk prediction.
• Current methods like bone mineral density (BMD) may not fully capture bone's structural integrity.

Purpose of the Study:

• To develop a novel method for quantifying cancellous bone architecture from in vivo MRI of the distal radius.
• To assess the utility of these derived architectural parameters in predicting vertebral fracture status in women with osteopenia.

Main Methods:

• Utilized 3D spin-echo MRI of the distal radius in 36 women.
• Developed a histogram deconvolution method for analyzing cancellous bone structure at limited spatial resolution.
• Quantified parameters including intertrabecular spacing, contiguity, and tubularity (longitudinal alignment).

Main Results:

• Neither BMD nor individual structural parameters significantly correlated with vertebral deformity.
• A combined function of tubularity and longitudinal spacing showed a strong correlation with vertebral deformity fraction (r = .78, P < .005).

Conclusions:

• Histomorphometric parameters of distal radius cancellous bone can be reliably derived from in vivo MRI.
• These MRI-derived parameters are significant predictors of vertebral deformity, offering a promising tool for fracture risk assessment.