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Appositional bone formation rates in the Beagle.

C Anderson, K D Danylchuk

    American Journal of Veterinary Research
    |July 1, 1979
    PubMed
    Summary
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    Accurate bone formation rate measurements in Beagles require considering tetracycline ring size. Only haversian systems with outer rings >0.35 mm yield reliable appositional bone formation rate data.

    Area of Science:

    • Histology
    • Bone Biology
    • Animal Research

    Background:

    • Haversian systems are key structural units in bone.
    • Tetracycline labeling is a common method to measure bone apposition rates.
    • Standardized research colony Beagles are often used in preclinical studies.

    Purpose of the Study:

    • To evaluate the reliability of haversian appositional bone formation rate measurements in Beagles.
    • To determine the influence of tetracycline ring circumference on measurement accuracy.

    Main Methods:

    • Analysis of 400 haversian systems from the 11th rib midshaft of 28-month-old Beagles.
    • Measurement of outer tetracycline ring circumference.
    • Assessment of bone appositional formation rate regularity.

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    Main Results:

    • Bone appositional formation rates were gradual and regular when outer tetracycline ring circumference exceeded 0.35 mm.
    • Measurement regularity decreased significantly when outer tetracycline ring circumference was less than 0.35 mm.

    Conclusions:

    • The size of the tetracycline ring circumference is critical for accurate bone formation rate assessment.
    • Haversian systems with outer tetracycline ring circumferences below 0.35 mm can lead to erroneous conclusions.
    • For significant findings, measurements must consistently use haversian systems with outer tetracycline ring circumferences above 0.35 mm in both pre- and post-biopsy samples.