Anatomical Measurements of Pudendal Nerve Block in Children

January 9, 2026 updated by: Münevver Kayhan, Istanbul University - Cerrahpasa

Investigation of the Distance of the Needle Entry Point From the Anus and the Depth to Reach the Pudendal Nerve in Pudendal Nerve Block Application in Children

This prospective observational study aims to investigate the relationship between anatomical parameters-specifically the distance from the anus to the needle insertion point and the depth required to reach the pudendal nerve-during neurostimulation-guided pudendal nerve block and patients' age, height, and weight in children undergoing penile surgery.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

The pudendal nerve originates from the sacral nerve roots Sacral2-Sacral4 and provides sensory and motor innervation to the penile and perineal regions. Effective postoperative analgesia is essential in pediatric penile surgeries. Pudendal nerve block may provide longer-lasting and more effective analgesia compared to caudal or penile blocks.

However, due to age- and size-related anatomical variability in children, data regarding optimal needle insertion distance and depth to reach the pudendal nerve are limited. In this study, neurostimulation will be used to confirm pudendal nerve localization, and anatomical measurements will be analyzed in relation to demographic parameters.

Study Type

Observational

Enrollment (Estimated)

50

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

  • Name: Pinar Kendigelen, Professor Doctor
  • Phone Number: 02124143000
  • Email: pinarken@gmail.com

Study Locations

  • Turkey (Türkiye)
    • Istanbul
      • Bakırköy, Istanbul, Turkey (Türkiye), 34153
        • Istanbul University-Cerrahpasa, Cerrahpasa Medicine of Faculty
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

This study includes children aged 1-18 years who are undergoing penile surgery. Neurostimulation-guided pudendal nerve block will be performed, and anatomical measurements, including the horizontal distance from the anus to the needle insertion point and the depth from the skin to the pudendal nerve, will be recorded. Measurements will be taken separately for the right and left sides. Patient age, height, and weight will also be recorded, and their relationship with the anatomical measurements will be analyzed. The study will be conducted at Istanbul University-Cerrahpasa, Department of Pediatric Surgery.

Description

Inclusion Criteria:

  • Children aged 1-18 years
  • Scheduled for penile surgery (e.g., hypospadias, phimosis)
  • Planned to receive neurostimulation-guided pudendal nerve block
  • Patient and parents/legal guardians willing to participate under general anesthesia

Exclusion Criteria:

  • Patients with incomplete measurement data
  • Cases where successful nerve block cannot be performed or nerve stimulation is not detectable at currents ≥1.5 mA
  • Patients or parents/legal guardians who refuse pudendal nerve block
  • Patients with pelvic deformities or neuromuscular disorders

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Pediatric Penile Surgery Cohort
Children aged 1-18 years undergoing penile surgery with neurostimulation-guided pudendal nerve block; anatomical measurements of needle insertion distance from anus and nerve depth are recorded.
Procedure: Neurostimulation-Guided Pudendal Nerve Block
Bilateral pudendal nerve block is performed under general anesthesia with neurostimulation guidance. Anatomical measurements, including distance from anus to needle insertion point and nerve depth, are recorded for each patient. Bupivacaine 0.25% is used at 0.25 ml/kg per side, with a maximum total dose of 2 mg/kg.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Horizontal distance from anus to needle insertion point and Depth from skin surface to pudendal nerve
Time Frame: During pudendal nerve block procedure
The horizontal distance from the anus to the needle insertion point is measured in centimeters for each patient using neurostimulation-guided pudendal nerve block. Measurements are recorded separately for the right and left sides.The depth from the skin surface to the pudendal nerve is measured in centimeters using neurostimulation guidance. Measurements are recorded separately for the right and left sides. The relationship of this distance and the association of nerve depth with patient age, height, and weight will be analyzed.
During pudendal nerve block procedure

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Istanbul University - Cerrahpasa

Investigators

  • Principal Investigator: münevver kayhan, Lecturer Doctor, Istanbul University-Cerrahpasa, Cerrahpasa Medicine of Faculty
  • Study Chair: Ayse Cigdem Tutuncu, Professor Doctor, Istanbul University-Cerrahpasa, Cerrahpasa Medicine of Faculty
  • Study Chair: Pinar Kendigelen, Istanbul University-Cerrahpasa, Cerrahpasa Medicine of Faculty

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

January 20, 2026

Primary Completion (Estimated)

May 20, 2026

Study Completion (Estimated)

June 10, 2026

Study Registration Dates

First Submitted

January 9, 2026

First Submitted That Met QC Criteria

January 9, 2026

First Posted (Estimated)

January 16, 2026

Study Record Updates

Last Update Posted (Estimated)

January 16, 2026

Last Update Submitted That Met QC Criteria

January 9, 2026

Last Verified

January 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • ctf- pudental mesafe- 04

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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