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Interstitial fluid flow in cortical bone.

R J Montgomery1, B D Sutker, J T Bronk

  • 1Department of Orthopedics, Mayo Clinic, Rochester, Minnesota.

Microvascular Research
|May 1, 1988
PubMed
Summary
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Ferritin injected into dog tibial arteries moved through bone interstitial fluid, indicating bulk flow. This movement occurred in patterns around capillaries and through unlined channels, suggesting a unique fluid transport system in bone.

Area of Science:

  • Bone biology
  • Fluid dynamics in bone tissue
  • Microcirculation

Background:

  • Understanding fluid transport within bone is crucial for nutrient delivery and waste removal.
  • The existence and function of lymphatic-like vessels in bone matrix remain poorly understood.

Purpose of the Study:

  • To investigate the pathways and mechanisms of interstitial fluid movement within the tibial cortex of adult dogs.
  • To identify potential routes for fluid and solute transport in bone.

Main Methods:

  • Injection of ferritin tracer into the tibial nutrient artery of adult dogs.
  • Microscopic observation of ferritin distribution in the tibial cortex at various time points post-injection.
  • Analysis of ferritin movement patterns in relation to osteons, capillaries, and bone matrix.

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Main Results:

  • Ferritin rapidly appeared in the interstitial fluid of the tibial cortex, persisting for up to 25 minutes.
  • Ferritin exhibited centrifugal movement around central capillaries within osteons, forming halo patterns.
  • Ferritin moved towards the periosteal surface, forming a front, with movement delayed by appositional bone.
  • Ferritin was observed in endothelial-lined channels identified as 'matrix prelymphatics' and 'perivascular prelymphatics'.

Conclusions:

  • Interstitial fluid in the tibial cortex moves via bulk flow, influenced by hydrostatic pressure.
  • Bone possesses prelymphatic channels within the matrix and perivascular spaces that facilitate fluid transport.
  • These findings suggest a previously unrecognized fluid transport system within the bone cortex.