Comparison of Ultrasound and Anatomic Landmark Techniques of the Ulnar and Posterior Tibial Nerves

March 31, 2026 updated by: J. Ross Renew, M.D., Mayo Clinic
The purpose of this study is to determine whether placement of stimulating electrodes over the ulnar nerve is important for proper delivery of current leading to stimulation of intrinsic hand muscles.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Detailed Description

Placement of stimulating electrodes over the ulnar nerve is important for proper delivery of current leading to stimulation of intrinsic hand muscles. Accuracy may be improved with a better description of the precise location of the ulnar nerve. There may be a simple fraction of the wrist width that can be utilized to assist the busy practitioner with accurate placement of the stimulating electrodes over the ulnar nerve. It is expected that the ulnar groove, when easily identified, will be an accurate estimate (within 10% of total wrist width) of the ulnar nerve location.

Study Type

Observational

Enrollment (Estimated)

40

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 Locations

  • United States
    • Florida
      • Jacksonville, Florida, United States, 32224
        • Mayo Clinic

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

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Sampling Method

Probability Sample

Study Population

Mayo Clinic employees who meet inclusion/exclusion criteria

Description

Inclusion Criteria:

• English speaking

Exclusion Criteria:

  • History of ulnar neuropathy or ulnar nerve or wrist surgery (i.e. carpal tunnel)
  • Upper extremity edema

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
Volunteers
Employee volunteers will have hand measurements obtained to help identify location of ulnar nerve.
Other: Hand measurements

Ulnar right:

  • Width of wrist
  • Distance from radial side to middle of ulnar groove

  • Photo of ulnar groove

    o Grade ability to identify: easy, moderate-difficult, unable

  • Ultrasound measurements

Ulnar left:

  • Width of wrist
  • Distance from radial side to middle of ulnar groove

  • Photo of ulnar groove

    o Grade ability to identify: easy, moderate-difficult, unable

  • Ultrasound measurements
Other: Foot/ankle measurements

Posterior tibial right:

  • Distance between prominence of medial malleolus and mid-Achilles tendon
  • Distance artery point of maximal pulsation to posterior border of medial malleolus
  • Distance artery point of maximal pulsation to medial border of Achilles tendon

  • Photo taken after palpating posterior tibial artery

    o Grade ability to identify: easy, moderate-difficult, unable

  • Ultrasound measurements

Posterior tibial left:

  • Distance between prominence of medial malleolus and mid-Achilles tendon
  • Distance artery point of maximal pulsation to posterior border of medial malleolus
  • Distance artery point of maximal pulsation to medial border of Achilles tendon

  • Photo taken after palpating posterior tibial artery

    o Grade ability to identify: easy, moderate-difficult, unable

  • Ultrasound measurements

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Wrist width
Time Frame: Baseline
Width of wrist will be measured with calipers and reported in inches
Baseline
Reliability of wrist width to locate ulnar nerve
Time Frame: Baseline
Total number of times that the ulnar nerve, as identified with ultrasound, falls between 5-15% of the wrist width distance as measured from the ulnar side of the wrist
Baseline

Collaborators and Investigators

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

Sponsor

Mayo Clinic

Investigators

  • Principal Investigator: J. Ross Renew, MD, Mayo Clinic

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)

April 1, 2026

Primary Completion (Estimated)

January 1, 2027

Study Completion (Estimated)

January 1, 2027

Study Registration Dates

First Submitted

March 31, 2026

First Submitted That Met QC Criteria

March 31, 2026

First Posted (Actual)

April 7, 2026

Study Record Updates

Last Update Posted (Actual)

April 7, 2026

Last Update Submitted That Met QC Criteria

March 31, 2026

Last Verified

March 1, 2026

More Information

Terms related to this study

Other Study ID Numbers

  • 25-013952

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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