Subchondral bone density distribution in the human femoral head

David A. Wright, Michael Meguid, Omri Lubovsky, Cari M. Whyne

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Objective This study aims to quantitatively characterize the distribution of subchondral bone density across the human femoral head using a computed tomography derived measurement of bone density and a common reference coordinate system. Materials and methods Femoral head surfaces were created bilaterally for 30 patients (14 males, 16 females, mean age 67.2 years) through semi-automatic segmentation of reconstructed CT data and used to map bone density, by shrinking them into the subchondral bone and averaging the greyscale values (linearly related to bone density) within 5 mm of the articular surface. Density maps were then oriented with the center of the head at the origin, the femoral mechanical axis (FMA) aligned with the vertical, and the posterior condylar axis (PCA) aligned with the horizontal. Twelve regions were created by dividing the density maps into three concentric rings at increments of 30° from the horizontal, then splitting into four quadrants along the anterior-posterior and mediallateral axes. Mean values for each region were compared using repeated measures ANOVA and a Bonferroni post hoc test, and side-to-side correlations were analyzed using a Pearson's correlation. Results The regions representing the medial side of the femoral head's superior portion were found to have significantly higher densities compared to other regions (p<0.05). Significant side-to-side correlations were found for all regions (r 2=0.81 to r 2=0.16), with strong correlations for the highest density regions. Side-to-side differences in measured bone density were seen for two regions in the anterio-lateral portion of the femoral head (p<0.05). Conclusions The high correlation found between the left and right sides indicates that this tool may be useful for understanding 'normal' density patterns in hips affected by unilateral pathologies such as avascular necrosis, fracture, developmental dysplasia of the hip, Perthes disease, and slipped capital femoral head epiphysis.

Original languageEnglish
Pages (from-to)677-683
Number of pages7
JournalSkeletal Radiology
Volume41
Issue number6
DOIs
StatePublished - 1 Jun 2012
Externally publishedYes

Keywords

  • Bone density distribution
  • Computed tomography
  • Femoral head
  • Subchondral bone

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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