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Osseous Repair in Minimally Invasive Reconstruction of Anterior Skull Base Defects
Vijay R Ramakrishnan1, Adam M Terella, Seerat Poonia
1*Department of Otolaryngology †Department of Neurosurgery ‡University of Colorado School of Medicine, Aurora, CO §Department of Otolaryngology-Head and Neck Surgery, University of Kansas, Kansas City, KS ||Department of Otolaryngology-Head and Neck Surgery, University of Pennsylvania, Philadelphia, PA.
Human anterior skull base defects do not spontaneously close. Free bone grafts show good incorporation, indicating their utility for skull base reconstruction regardless of defect size.
Area of Science:
- Neurosurgery
- Skull Base Surgery
- Reconstructive Surgery
Background:
- Management of anterior skull base defects involves innovative surgical techniques.
- Various grafting materials are used, influenced by defect size, availability, and surgeon preference.
- Spontaneous bony closure of skull defects occurs in animal models but remains unexplored in humans.
Purpose of the Study:
- To evaluate spontaneous osseous closure of human anterior skull base defects.
- To assess the long-term incorporation of free bone grafts in skull base reconstruction.
- To compare bony closure in reconstructed defects versus non-reconstructed sellar defects.
Main Methods:
- Retrospective review of 13 patients undergoing endoscopic skull base repair with free bone grafts.
- Postoperative computed tomography (CT) scans were used to assess bone graft incorporation.
- Comparison with postoperative radiology from transsphenoidal surgery patients without rigid reconstruction.
Main Results:
- Free bone grafts demonstrated significant incorporation (84.6% partial or complete) at a mean of 5.3 years postoperatively.
- No spontaneous osseous closure was observed in human anterior skull base defects, even small ones.
- Patients undergoing pituitary surgery without reconstruction showed no spontaneous bony closure of sellar defects.
Conclusions:
- Human anterior skull base defects do not appear to close spontaneously, unlike in animal models.
- There is no "critical size defect" for spontaneous closure in the human skull base.
- Free bone grafts are reliable for long-term, rigid skull base reconstruction, irrespective of defect size.
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