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Related Experiment Videos

Pulverized bone matrix as an injectable bone graft in rabbit radius defects.

P Aspenberg, J Wittbjer, K G Thorngren

    Clinical Orthopaedics and Related Research
    |May 1, 1986
    PubMed
    Summary

    Injectable demineralized bone matrix enhanced bone repair in rabbits, with pulverized particles showing initial advantages. Calcium-45 (Ca45) measurements offered superior precision for evaluating bone regeneration compared to Technetium-99m MDP scintimetry.

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    Area of Science:

    • Orthopedic Surgery
    • Biomaterials Science
    • Regenerative Medicine

    Background:

    • Bone defects often require grafting for effective repair.
    • Demineralized bone matrix (DBM) is a common bone graft material.
    • Optimizing DBM preparation and delivery is crucial for enhancing bone regeneration.

    Purpose of the Study:

    • To compare the efficacy of pulverized versus non-pulverized demineralized bone matrix (DBM) mixed with autologous bone marrow for bone defect repair in rabbits.
    • To evaluate the accuracy of radiographic planimetry, Tc99m MDP scintimetry, and Ca45 content analysis in quantifying bone yield.
    • To assess the overall impact of injectable DBM preparations on bone healing.

    Main Methods:

    • A critical-sized defect was created in the rabbit radius diaphysis.

    Related Experiment Videos

  • Demineralized bone matrix was prepared either pulverized or non-pulverized and mixed with autologous bone marrow.
  • The prepared DBM was implanted into the defect.
  • Bone yield was assessed using radiographic planimetry and Tc99m MDP scintimetry.
  • Ash weight and Ca45 content were measured in transverse bone segments.

    • Main Results:

    • Initially, pulverized DBM showed a higher ash weight at two weeks compared to non-pulverized DBM.
    • No significant difference in ash weight was observed between the groups by four weeks.
    • Injectable DBM preparations did not impede the natural bone repair process.
    • Ca45 content analysis provided high-precision data, demonstrating greater reliability than Tc99m MDP scintimetry in assessing biologic variation.

    Conclusions:

    • Pulverization of DBM may offer a temporary advantage in early bone formation, but differences diminish over time.
    • Injectable DBM preparations are a viable option for bone defect repair without compromising healing.
    • Ca45 measurement is a more precise method for quantifying bone regeneration and assessing variability in preclinical studies.