Can the Phoenix Sign be Elicited With D5W

April 30, 2026 updated by: Stephen Barrett, US Neuropathy Centers

Elicitation of the Phoenix Sign With Non-guided Subcutaneous D5W Infiltration

To determine if the Phoenix sign can be reliably elicited with non-guided subcutaneous infiltration of D5W (5% Dextrose in Water) in patients with subclinical weakness of the extensor hallucis longus (EHL) muscle.

Study Overview

Status

Enrolling by invitation

Conditions

Intervention / Treatment

Detailed Description

  • To determine the prevalence of subclinical EHL weakness in a general clinical population
  • To measure the time course of strength changes following D5W infiltration
  • To identify potential predictive factors for positive response to treatment

Study Type

Interventional

Enrollment (Estimated)

600

Phase

  • Not Applicable

Contacts and Locations

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

Study Locations

  • United States
    • Georgia
      • Marietta, Georgia, United States, 30067
        • US Neuropathy Centers

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
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • subjects must have a weakness of dorsiflexion and specifically of the Extensor Hallucis Longus muscle
  • drop foot

Exclusion Criteria:

  • Trypanaphobia
  • allergy to D5W

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

  • Primary Purpose: Diagnostic
  • Allocation: N/A
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Infiltration of D5W
3 cc's of D5W will be infiltrated subcutaneously at the level of the fibular neck to see if there is any improvement in dorsiflexion strength at 4 and 10 minutes post infiltration.
Drug: Infiltration of D5W
There is no other intervention.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Changes in motor strength of dorsiflexion of the anterior and lateral compartments of the lower extremity
Time Frame: From enrollment to end of their treatment at 1 day
Each subject will receive the infiltration and then be assessed for any changes in motor strength at 4 and 10 minutes after the injection.
From enrollment to end of their treatment at 1 day
Presence of absence of increase in motor strength of the lower extremity in dorsiflexion
Time Frame: From enrollment to the end of the day
Using manual motor testing the strength of the lower extremity in dorsiflexion will be evaluated with a score of 1-5 out of 5.
From enrollment to the end of the day
Number of subjects that have increased dorsiflexion strength after D5W infiltration
Time Frame: Enrollment to end of clinic vist in 1 hour
Subjects will be evaluated by manual motor testing of the patient before and after infiltration of D5W on a 1 to 5 out of 5 mother strength grading.
Enrollment to end of clinic vist in 1 hour

Collaborators and Investigators

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

Sponsor

US Neuropathy Centers

Investigators

  • Principal Investigator: Stephen L Barrett, DPM MBA, US Neuropathy Centers LLC

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 10, 2026

Primary Completion (Estimated)

September 1, 2026

Study Completion (Estimated)

January 15, 2027

Study Registration Dates

First Submitted

April 5, 2026

First Submitted That Met QC Criteria

April 30, 2026

First Posted (Actual)

May 5, 2026

Study Record Updates

Last Update Posted (Actual)

May 5, 2026

Last Update Submitted That Met QC Criteria

April 30, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • USNC

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

product manufactured in and exported from the U.S.

Yes

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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