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Related Experiment Videos

Trabecular minimodeling in human iliac bone.

S Kobayashi1, H E Takahashi, A Ito

  • 1Department of Orthopaedic Surgery, Shinshu University School of Medicine, Matsumoto, Japan. seneki@hsp.md.shinshu-u.ac.jp

Bone
|March 14, 2003
PubMed
Summary
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This study provides histologic evidence that trabecular bone modeling, or minimodeling, continues throughout adult human life. These findings support Frost's hypothesis and have implications for bone histomorphometry in adults.

Area of Science:

  • Bone Biology
  • Skeletal Physiology
  • Histomorphometry

Background:

  • Bone remodeling is the primary mechanism for bone tissue renewal in adults.
  • Frost's hypothesis proposed that bone modeling, a distinct process, might persist in trabeculae throughout life.
  • Previous research lacked definitive histologic evidence to confirm lifelong trabecular modeling.

Purpose of the Study:

  • To investigate Frost's hypothesis by seeking histologic evidence of trabecular modeling (minimododeling) in adult human bone.
  • To assess the prevalence and characteristics of minimodeling in transiliac bone biopsy specimens.
  • To determine the implications of minimodeling for bone histomorphometry parameters.

Main Methods:

  • Histomorphometric analysis of transiliac bone biopsy specimens from 34 adult patients (38-81 years).

Related Experiment Videos

  • Utilized fluorochrome labeling and identification of smooth cement lines as indicators of minimodeling.
  • Excluded patients with metabolic bone diseases or relevant medication use; confirmed biopsy site integrity via bone scintigraphy.

    • Main Results:

    • Histologic evidence of minimodeling was detected in 62% of specimens (63% in postmenopausal patients).
    • Minimodeling sites represented a small fraction of total bone volume (<1%) but a significant portion of osteoid volume (~10%) and labeled surface (25-50%).
    • Minimodeling presence correlated with smaller patient physique, accelerated mineralization, and higher bone turnover rates.

    Conclusions:

    • The findings support Frost's hypothesis that bone modeling (minimododeling) can continue throughout adult human life.
    • Minimododeling should be considered in adult bone histomorphometry, particularly for osteoid volume and mineralization assessments.
    • Further verification in larger, healthy populations is warranted.