Trabecular bone mineral density correlations using QCT: Central and peripheral human skeleton

Area of Science:

• Biomechanics
• Orthopedics
• Radiology

Background:

• Musculoskeletal injuries to the lower leg and foot-ankle are common from external loads.
• Bone mineral density (BMD) is a key indicator of bone strength.
• Standard BMD assessments focus on the hip and spine.

Purpose of the Study:

• To investigate the correlation between BMD in standard clinical sites (hip, lumbar spine) and non-standard sites (foot-ankle-distal tibia).
• To determine if hip or lumbar spine BMD can predict BMD in the hind foot.
• To explore the utility of hind foot BMD in predicting hip injury risk.

Main Methods:

• Quantitative computed tomography (QCT) was used to measure trabecular BMD in 21 post-mortem human subjects (PMHS).
• BMD was quantified in the talus, distal tibia, and calcaneus.
• Correlations were analyzed between hind foot BMD and available hip and lumbar spine BMD data.

Main Results:

• Trabecular BMD was highest in the talus, followed by the distal tibia and calcaneus.
• Distal tibia BMD showed the strongest correlation with hip intertrochanter BMD (R²=0.72).
• Calcaneus BMD best correlated with hip femoral neck BMD (R²=0.64).

Conclusions:

• Hind foot bone BMD correlates better with hip BMD than lumbar spine BMD.
• Hip BMD may serve as a better predictor of hind foot injury risk than lumbar spine BMD.
• Calcaneal BMD could potentially predict hip injury risk, and these correlations can enhance finite element models for injury prediction.