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Osteoclast stimulation by positive middle-ear air pressure
Archives of Otolaryngology--Head & Neck Surgery
|October 1, 1986
Summary
Minute increases in middle ear pressure, without foreign objects, stimulate osteoclastic bone resorption. This finding clarifies the role of pressure in pathologic bone loss, particularly concerning cholesteatoma.
Area of Science:
- Otolaryngology
- Pathology
- Biomedical Engineering
Background:
- Pathologic bone resorption in cholesteatoma is not fully understood.
- Transmitted pressure is a suspected factor in osteoclast activation.
- Prior studies were limited by confounding foreign body effects.
Purpose of the Study:
- To investigate the direct effect of positive air pressure on osteoclast activity in the middle ear.
- To isolate pressure as the sole variable, excluding foreign body responses.
Main Methods:
- Positive air pressures were applied to the middle ear of Mongolian gerbils using implanted Silastic catheters.
- Histologic evaluation of the ventral bulla wall was conducted after two weeks of pressure application.
- Osteoclast number density, area density, and size were quantified.
Main Results:
- A significant increase in osteoclast number density, area density, and size was observed at pressures of 4, 6, 10, and 20 mm Hg.
- No significant changes in osteoclasts were noted at 2 mm Hg.
- These results demonstrate a pressure-dependent stimulation of osteoclasts.
Conclusions:
- Minute increases in middle ear pressure, independent of foreign objects, stimulate osteoclastic bone resorption.
- This study provides direct evidence for pressure-induced bone resorption in the middle ear.
- Findings have implications for understanding bone erosion in conditions like cholesteatoma.