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Chronic Pelvic PainPhase 2VOICENCT06673108

Vaginal Photobiomodulation for Chronic Pelvic Pain

A Phase 2 study testing SoLa Pelvic Therapy in people with Chronic Pelvic Pain and Chronic Pelvic Pain Syndrome (CPPS), run by SoLa Pelvic Therapy at 11 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

The goal of this clinical study is to determine if 8 treatments with photobiomodulation using near-infrared laser energy can help reduce chronic pelvic pain in women. Additionally, researchers want to determine if treatment with this type of energy can also alleviate pain with activities such as standing, sitting… Read more about this study

Who is it for?
Ages 18 years and older, women only
What is being tested?
SoLa Pelvic Therapy
Type of treatment
Medical device
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
128 participants
Where
11 sitesUnited States
Study dates
17 Oct 2024to 17 Jun 2026
Phase
Phase 2
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • Women only
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Age 18 years or older;
  • CPP for 3 months or longer;
  • Overall pelvic pain severity ≥4 in the last 7 days;
  • Pelvic muscle tenderness pain level ≥4.

Who cannot join

  • Previous vaginal or vulvar laser therapy;
  • Receiving concurrent pelvic physical therapy;
  • Unable to tolerate vaginal/pelvic examination
  • Taking drugs that have heat- or light- sensitive contraindications;
  • Subjectively reports abnormal or decreased sensation in the vagina or rectum;
  • History of cancer of the cervix, vagina, uterus, bladder, or vulva or suspected of having neoplasia or pre-cancerous lesions;
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  • History of autoimmune inflammatory conditions such as vulvar lichen sclerosis or other types of dermatoses;
  • History of vaginal trauma, ulcerations, erosions, or other evidence of vaginal and vulvar skin breakdown;
  • Less than 6 months post-partum;
  • Actively trying to get pregnant or not willing to use contraception during the trial;
  • Positive pregnancy test or planning to get pregnant during the study;
  • Vaginal discharge or bleeding concerning for neoplasia, infectious, or autoimmune condition; *
  • Pelvic pain has not been fully evaluated or pain is not confirmed as chronic pelvic pain;
  • Does not speak, read, or writes English and thus cannot complete surveys;
  • Does not have access to smart digital devices or computer, or cannot receive emails.

Trial locations and contacts

11 sites in 1 country.

11 sites in 1 country

United States11 sites
  • Obgyn South

    Birmingham, Alabama, 35209

  • Boston Urogyn

    Boston, Massachusetts, 02481

  • The Thompkins Center

    Brentwood, Tennessee, 37027

  • Horizons Health and Wellness

    Bridgewater, Massachusetts, 02324

  • The Continence Program-Southeast Urogyn

    Flowood, Mississippi, 39232

  • Nurture Women's Health

    Frisco, Texas, 75035

  • Minnesota Women's Care: OBGYN and Urogynecology

    Maplewood, Minnesota, 55109

  • The Clark Center for Urogynecology

    Newport Beach, California, 92663

  • Urogynecology of Kansas City

    Overland Park, Kansas, 66214

  • The Orady Womens Clinic

    San Francisco, California, 94109

  • IntimMedicine Specialists

    Washington D.C., District of Columbia, 20036

Other trials in United States

About this study

Official title: Vaginal Photobiomodulation for Chronic Pelvic Pain: A Randomized Controlled Trial

The goal of this clinical study is to determine if 8 treatments with photobiomodulation using near-infrared laser energy can help reduce chronic pelvic pain in women. Additionally, researchers want to determine if treatment with this type of energy can also alleviate pain with activities such as standing, sitting, urinating, having bowel movements and intercourse.

Read the detailed description

This clinical trial will be a multi-center, triple-masked randomized study comparing vaginal photobiomodulation to sham, for the treatment of chronic pelvic pain in women. The study will include 126 participants, 63 randomized to vaginal photobiomodulation and 63 randomized to vaginal sham treatment. Potential participants will be recruited in communities and clinics where gynecologists are routinely evaluating patients for chronic pelvic pain.

Women who fulfill inclusion criteria will undergo, screening gynecologic evaluation to ensure they can participate. Informed and written consent will be obtained from all study participants prior to enrollment.

After consent, participants will be randomized to 8 treatments with active photobiomodulation or sham administered twice a week. Study subjects will be randomized using blocked 1:1 randomization with random permuted blocks of 4. Participants, study investigators, staff, and statisticians will remain masked throughout the study and unaware of whether sham or active laser is being administered to each participant.

Treatments will be administered using the SoLá Pelvic Therapy laser, which has been modified to emit sham or active photobiomodulation through the vagina using a thin laser wand protected by a sterile plastic covering. Treatments will be administered by a gynecology providers who specialize in evaluation and management of chronic pelvic pain. The SoLá Pelvic Therapy device auto-calculates power and duration of treatment based on vaginal length. The procedure typically lasts 3-6 minutes depending on the vaginal length and the pre-determined dosing selected by the device.

Patient reported pain levels will be assessed prior to each treatment and again at 1-week and 3-months after treatment. Pain levels will be obtained from both groups at baseline and after each treatment, while demographics, pain intensity, pain impact, pain behavior, and quality of life measures (QoL) will be collected at baseline and after treatment. Need for additional therapies, global impression of change, adherence and satisfaction will be assessed after 8 treatments. To assess effect duration, both groups will be followed for an additional 3 months, after which pain levels, QoL, use of additional treatments, global health, global impression of change, and satisfaction with the procedure will be assessed. After the 3-month follow-up, participation will come to an end.

The primary outcome will be to determine the percentage of participants who achieve a minimal clinically important difference (MCID) in overall pelvic pain, defined as a post-treatment decrease of ≥2 points on a 0-10 pain NRS (Numeric Rating Scale) at 3 months compared to baseline. Secondary outcomes include changes from baseline in:

  • mean NRS pain levels of overall pelvic pain and symptom specific pelvic pain (pain with exercise, sitting, standing, bowel movements, urination, and intercourse);
  • percentage of patients achieving MICD for symptom specific pelvic pain
  • quality of life measured by decrease in pain intensity, impact, and interference, reduced need for additional treatments;
  • improvement in global health;
  • global impression of change,
  • adherence and satisfaction with treatment. The intervention will be considered superior if 30% or higher percentage of participants achieve MCID compared to placebo (e.g., 30% in sham group vs 60%), or the intervention results in ≥1.1 NRS points reduction in mean pain levels compared to sham (e.g., intervention reduces mean pain levels by 2.4 points while sham reduces mean pain levels by 1.2 NRS points).

All patient reported outcomes (PROs) will be recorded using electronic surveys; many are specifically validated to measure pelvic pain, pelvic function, and quality of life.

Being tested
SoLa Pelvic Therapy, Sham

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • SoLa Pelvic TherapyDevice

    Also called Low level laser therapy

    SoLá Pelvic Therapy laser emits near-infrared (810-980 nm wavelength) energy to the vaginal tissues. The device treats at 6 W for 3-6 minutes and delivers a fluence of 300-1,600 J/cm2 through a sterile vaginal probe. Specific treatment time is calculated based on vaginal length. Based on a code input, the device can cycle between emitting laser energy or sham which is visible light without focused laser energy.

  • ShamDevice

    Sham red light WITHOUT focused laser energy.

Study groups in NCT06673108
Study groupRoleWhat they receive
Vaginal photobiomodulationActive comparatorVaginal photobiomodulation with near-infrared (810-980nm wavelength) energy.
Receives: Device: SoLa Pelvic Therapy
Sham-Light without laser energy.Sham comparatorVaginal light therapy without focused laser energy.
Receives: Device: Sham

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Overall pelvic pain

    Overall pelvic pain level as measured on a 0-10 numeric rating pain scale (NRPS). On this scale, 0 represents no pain and 10 represents wors pain possible. Pain will be analyzed as median pain levels and % of participants achieving a minimal clinically important difference (MCID) defined as reduction in pain level of 2 or more NRPS points.

    Measured: At baseline, at 1-week after completing treatment, and at 3 months after completing treatment.

Secondary outcomes (8)
  1. Symptom specific pelvic pain

    Pain with exercise, sitting, standing, bowel movements, urination, and intercourse as measured on a 0-10 numeric rating pain scale and analyzed in the same manner as the primary outcome 'overall pelvic pain'.

    Measured: At baseline, at 1-week after completing treatment, and at 3 months after completing treatment.

  2. Pain impact

    Pain intensity as measured by Patient Reported Outcomes Measurement Information System (PROMIS) Pain Intensity Scale and Pain Interference Scale. The scales assess the impact of pain on activity, mood, relationships, sleep, and general enjoyment of life. The PROMIS Pain Intensity Scale asks participants to categorize pain intensity in the last 7 days, as an ordinal categorical scale using words like 'had no pain', 'mild', 'moderate', 'severe', and 'very severe', and the PROMIS Pain Interference Scale asks participants about the degree that pain interferes with activity, work around the home, participation in social activities, things usually done for fun, enjoyment of life, family life. Participants can rank their answers as an ordinal scale using words like 'not at all', 'a little bit', 'somewhat', 'quite a bit', and 'very much'.

    Measured: At baseline, at 1-week after completing treatment, and at 3 months after completing treatment.

  3. Quality of life

    As measured by the Short Form-12 Health Survey (SF-12), a self-reported outcome measure assessing the impact of health on an individual's everyday life. The SF-12 assess general health and well-being [or health-related quality of life (HRQOL)], including the impact of any and all illnesses on a broad range of functional domains. The SF-12 has two components scored on a range of 0-100: a physical component score (PCS) and a mental component score (MCS). A score of 50 or less on the PCS-12 indicates poor physical functioning or a physical condition, because scores above 50 indicate better than average health related quality of life, while a score below 50 suggests below average health. A score of 42 or less on the MCS-12 may indicate clinical depression. Therefore, SF-12 scores above 50 indicate better health and scores below 50 indicate worse than average health.

    Measured: At baseline, at 1-week after completing treatment, and at 3 months after completing treatment.

  4. Global physical and mental health

    Global physical and mental health as measured by the PROMIS Global Health questionnaire. It contains questions that allows participants to rank their general physical health, ability to carry out every day physical activities such as walking, climbing stairs, carry groceries, or moving a chair, using an ordinal scale ranking 'excellent', 'very good', 'good', 'fair', and 'poor'. This questionnaire also contains questions that allows participants to rate their mental health including ability to think, and satisfaction with social activities and relationships on an ordinal scale ranking 'excellent', 'very good', 'good', 'fair', and 'poor'.

    Measured: At baseline, at 1-week after completing treatment, and at 3 months after completing treatment.

  5. Satisfaction with treatment.

    Likert scale to describe satisfaction and likelihood of recommending treatment to a friend with a similar condition. Satisfaction is assessed with one question where participants are asked to rank their satisfaction with SoLa Pelvic Therapy on a Likert ordinal scale ranking satisfaction as 'very satisfied', 'satisfied', 'not satisfied', and 'very satisfied'. Likelihood of recommending the therapy to a friend is assessed with a Likert ordinal scale ranking 'very likely', 'somewhat likely', 'not likely', and 'very unlikely'.

    Measured: At 1-week after completing treatment.

  6. Adherence with treatment.

    Measured as the percentage of completed treatments per participant and percentage of participants who completed 5 or more treatments.

    Measured: After 5 treatments are completed.

  7. Need for additional treatment

    Questionnaire that collects data on additional pharmacologic or non-pharmacologic, extra-pelvic, pain therapies used during the study duration (excluding laser and physical therapy).

    Measured: This questionnaire is completed once a week, prior to each treatment through administration of all 8 treatments (which are administered twice a week), and again at 3 months after completing the last treatment.

  8. Global impression of change

    a single, self-administered question asking respondents to rate whether their condition has changed after treatment compared to baseline before treatment. They are asked to select a response based on the following categories: 'very much improved', 'much improved', 'minimally improved', 'no change', 'minimally worse', 'much worse', and 'very much worse'.

    Measured: At 1-week after completing treatment, and at 3 months after completing treatment.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted4 Nov 2024
  2. Study start17 Oct 2024
  3. Primary completion17 Jun 2026
  4. Study completion17 Jun 2026

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Quadruple blind
Who is masked
Participant, Care provider, Investigator, Outcomes assessor
Enrolment
128 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06673108
Sponsor's protocol ID
SoLaPelvicTherapy
Acronym
VOICE
Status last verified
Oct 2025
First submitted
25 Oct 2024
Last updated
25 Aug 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
Yes
Individual data sharing
Yes: De-identified data tables may be shared after permission is obtained from the study sponsor.

Publications

  • Zipper R, Pryor B, Lamvu G. Transvaginal Photobiomodulation for the Treatment of Chronic Pelvic Pain: A Pilot Study. Womens Health Rep (New Rochelle). 2021 Nov 23;2(1):518-527. doi: 10.1089/whr.2021.0097. eCollection 2021.

    PubMed 34841398
  • Zipper R, Pryor B. Evaluation of a novel deep tissue transvaginal near-infrared laser and applicator in an ovine model. Lasers Med Sci. 2022 Feb;37(1):639-643. doi: 10.1007/s10103-021-03315-z. Epub 2021 Apr 14.

    PubMed 33855615

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing SoLa Pelvic Therapy in people with Chronic Pelvic Pain and Chronic Pelvic Pain Syndrome (CPPS), run by SoLa Pelvic Therapy at 11 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 4 inclusion and 15 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 25 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 11 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Overall pelvic pain (time frame: At baseline, at 1-week after completing treatment, and at 3 months after completing treatment.). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT06673108, which also lists 2 linked publications.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 25 Aug 2026; AzTrials last refreshed its copy on 6 Nov 2026.

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