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Surface localization of sacral foramina for neuromodulation of bladder function. An anatomical study
S T Hasan1, D A Shanahan, A K Pridie
1University Department of Surgery, University of Newcastle, Newcastle upon Tyne, UK.
European Urology
|January 1, 1996
Summary
This study details a new method for locating sacral foramina for bladder neuromodulation. It identifies risks like nerve root and vascular penetration, guiding safer needle placement.
Area of Science:
- Anatomy
- Neuromodulation
- Surgical Techniques
Background:
- Percutaneous sacral neuromodulation is used for bladder dysfunction.
- Accurate localization of sacral foramina is crucial for effective and safe procedures.
- Existing methods may have limitations in guiding needle placement.
Purpose of the Study:
- To describe a novel method for percutaneous localization of sacral foramina.
- To analyze needle entry paths and identify potential risks associated with different insertion angles and approaches.
- To enhance the safety and efficacy of sacral neuromodulation procedures.
Main Methods:
- Anatomical dissection of 10 human cadaver pelves (5 male, 5 female).
- Percutaneous needle placement into all sacral foramina from nine different angles using surface markings.
- Subsequent dissection to study needle paths and assess nerve root/vascular penetration.
Main Results:
- Any sacral foramen could be accessed from various angles.
- Increased needle entry angle correlated with higher nerve root/vascular penetration incidence.
- Medial approaches showed higher nerve root penetration than lateral entry.
- S1 foramen insertion risked arterial hemorrhage; S3/S4 insertions risked venous hemorrhage.
Conclusions:
- A new method for identifying sacral foramina surface markings and needle paths is proposed.
- Understanding insertion angles and approaches can mitigate risks of nerve root and vascular injury.
- The study highlights potential hemorrhage risks associated with specific sacral nerve root targeting.