Thumb Base Osteoarthritis: Ultrasound-guided Platelet-rich Plasma Versus Placebo Injection (Thumbs-up)

April 3, 2026 updated by: Evi Loos, Goed Medisch Centrum

Thumb Base Osteoarthritis: Ultrasound-guided Platelet-rich Plasma Versus Placebo Injection (Thumbs-up Study)

The goal of this clinical trial is to evaluate whether platelet-rich plasma (PRP) injections improve pain and function in adults with thumb base osteoarthritis (CMC-I OA).

The main questions it aims to answer are:

Does a PRP injection reduce pain compared to a placebo (saline) injection? Does PRP improve hand function, strength, and thumb mobility? What adverse events occur following PRP treatment?

Researchers will compare PRP injections to a placebo injection (saline solution) to determine whether PRP is an effective treatment for CMC-I osteoarthritis.

Participants will:

Receive a single ultrasound-guided injection of PRP or placebo (saline) in the CMC-I joint.

Attend follow-up visits at 3, 6, 9, and 12 months for clinical assessments. Complete questionnaires on pain (VAS) and hand function (MHQ-DLV) at multiple time points.

Undergo physical examinations (grip strength, pinch strength, thumb motion). Undergo ultrasound evaluations to assess joint characteristics.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
88

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Age 18 or older
  • Patients with an Eaton-littler score of I, II or III
  • Patients with uni- or bilateral CMC-I osteoarthritis
  • Non-responders to conservative therapy i.e., hand therapy and immobilisation after 3 months

Exclusion Criteria:

  • Aged below 18
  • Patients with an Eaton-littler score of IV (STT arthrosis)
  • Surgical interventions of the CMC-I joint
  • A known articular systemic disease (e.g. rheumatoid arthritis) or additional hand osteoarthritis/ tenosynovitis or metabolic disease like diabetes mellitus
  • Patients with an infectious arthritis of CMC-I joint
  • A known psychiatric condition
  • Neuropathic chronic pain syndrome
  • Intra articular injection 6 months prior to inclusion
  • Smoking
  • Active use of statins

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: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Platelet-rich plasma group A
Biological: Platelet-Rich Plasma (PRP) Injections
Autologous platelet-rich plasma (PRP) is prepared from 90 mL of the participant's venous blood using a standardized two-step centrifugation protocol (ACP® Max system, Arthrex Inc.). The first centrifugation is performed at 3200 rpm for 9 minutes, followed by a second centrifugation at 1500 rpm for 5 minutes, resulting in approximately 2 mL of PRP. A single injection of 2 mL PRP is administered under sterile conditions and ultrasound guidance into the CMC-I joint, consisting of 1 mL intra-articular and 1 mL peri-articular injection. No repeated injections are performed.
Placebo Comparator: Placebo group B
Saline
Drug: Saline (0.9% NaCl)
Participants receive a placebo injection consisting of 2 mL sterile saline (0.9% NaCl), administered under sterile conditions and ultrasound guidance into the CMC-I joint. The injection protocol is identical to the PRP group, with 1 mL injected intra-articularly and 1 mL peri-articularly. To maintain blinding, participants in the placebo group undergo a venous blood draw mimicking the PRP preparation procedure; however, the collected blood is discarded. The duration and procedural steps are standardized to ensure comparable treatment conditions between groups. No repeated injections are performed.
Other Names:
  • Placebo injection

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Clinical pain improvement: Visual Analog Scale (VAS) for pain
Time Frame: 3, 6, 9 and 12 months
Pain will be assessed using the Visual Analog Scale (VAS), a continuous scale ranging from 0 to 100, where 0 indicates no pain and 100 indicates worst imaginable pain. A decrease in VAS score reflects an improvement in pain.
3, 6, 9 and 12 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Functional improvement: Michigan Hand Outcomes Questionnaire (MHQ-DLV)
Time Frame: 3, 6, 9 and 12 months
Hand function will be assessed using the Michigan Hand Outcomes Questionnaire (MHQ), Dutch Language Version (MHQ-DLV). The MHQ is a patient-reported outcome measure consisting of multiple domains (including overall hand function, activities of daily living, pain, work performance, aesthetics, and patient satisfaction), each scored on a scale from 0 to 100. For all domains except pain, higher scores indicate better hand function and greater satisfaction. For the pain domain, higher scores indicate more severe pain.
3, 6, 9 and 12 months
Functional improvement: Grip and pinch test
Time Frame: 3, 6, 9 and 12 months
3, 6, 9 and 12 months
Functional improvement: Opposition of the thumb (pollexograph)
Time Frame: 3, 6, 9 and 12 months
3, 6, 9 and 12 months
Functional improvement: Kapandji Opposition Score
Time Frame: 3, 6, 9 and 12 months
Thumb opposition will be assessed using the Kapandji Opposition Score, a clinical scale ranging from 0 to 10, where 0 indicates no opposition and 10 indicates maximal opposition of the thumb across the palm. Higher scores indicate better thumb function and greater range of opposition.
3, 6, 9 and 12 months

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Goed Medisch Centrum

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Arthrex, Inc.

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)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
April 1, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
March 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
June 1, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
March 18, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 18, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
March 24, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
April 9, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 3, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
March 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • NL-010929

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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