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Anatomic considerations of halo pin placement
1Department of Orthopedic Surgery, Medical College of Ohio, Toledo, USA.
American Journal of Orthopedics (Belle Mead, N.J.)
|November 1, 1996
Summary
This study precisely mapped supraorbital and greater occipital nerves to define safe halo pin placement zones. Findings establish critical distances to prevent neurologic damage during halo fixation procedures.
Area of Science:
- Neurosurgery
- Anatomy
- Medical Device Safety
Background:
- Halo fixation is crucial for stabilizing severe spinal injuries.
- Accurate pin placement is vital to prevent neurological complications.
- Understanding the precise anatomical location of cranial nerves is essential for safe halo pin insertion.
Purpose of the Study:
- To quantitatively determine the anatomical location of supraorbital and greater occipital nerves relative to halo pin placement.
- To define a safe zone for anterolateral and posterolateral halo pin insertion.
- To minimize the risk of neurologic damage during halo fixation.
Main Methods:
- Quantitative anatomical analysis of supraorbital and greater occipital nerves.
- Measurement of nerve distances and angles with respect to the sagittal plane.
- Definition of safe zones based on mean nerve locations and variability.
Main Results:
- Mean distances of lateral branches from the midline were 3.9 cm (supraorbital) and 4.8 cm (greater occipital).
- Mean angles with the sagittal plane were 26.0° (supraorbital) and 38.0° (greater occipital).
- Safe placement sites are recommended at 4.5 cm (anterior) and 6.0 cm (posterior) lateral to the midlines.
Conclusions:
- Halo pins placed 4.5 cm and 6.0 cm lateral to the anterior and posterior midlines, respectively, are safe for supraorbital and greater occipital nerves.
- This study provides crucial anatomical data for optimizing halo pin placement and enhancing patient safety.
- Adherence to these defined safe zones can significantly reduce the risk of iatrogenic neurologic injury.