Prospective Paired Evaluation of Conventional Versus Structured Magnetic Resonance Imaging Interpretation for Preoperative Assessment of Gluteal Permanent Synthetic Filler Disease

September 7, 2026 updated by: Research Inc
This prospective paired diagnostic-impact study will compare conventional qualitative MRI reporting with a new structured anatomic classification in adults undergoing surgery for gluteal permanent synthetic filler disease. The structured report will document material effects across superficial, deep, muscular, regional, lymphatic, and interstitial compartments. Standardized intraoperative mapping will serve as the reference standard. The main outcome is the difference in sensitivity for surgically confirmed compartment involvement

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.

Detailed Description

Eligible participants will undergo a standardized pelvic and gluteal MRI before planned filler-removal surgery. The same examination will be interpreted using two prespecified formats: a conventional qualitative report and a structured report that grades involvement of the fat-fascia interface, subcutaneous fat, deep fascia, gluteal muscles, subcrestal, ischial, trochanteric, and pelvic-ring regions, as well as lymphatic and interstitial pathways. The operating surgeon will record a preliminary plan and utility rating after each report. During surgery, actual compartment involvement will be documented using a standardized map and, when available, specimen and histopathologic findings. Paired diagnostic performance, inter-reader agreement, change in surgical planning, and associations with operative complexity will be analyzed.

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.
Observational

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.
200

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

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

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

Sampling Method

Non-Probability Sample

Study Population

Adults with prior gluteal injection of permanent synthetic fillers who undergo preoperative pelvic/gluteal MRI and are scheduled for surgical removal or exploration.

Description

Inclusion Criteria:

  • Age 18 years or older.
  • History of gluteal injection with a permanent or unknown nonresorbable filler.
  • Preoperative pelvic/gluteal MRI performed using the study acquisition protocol.
  • Planned surgical removal, biopsy, or operative exploration within 90 days after MRI.
  • Written informed consent for paired image interpretation and use of operative findings.

Exclusion Criteria:

  • MRI contraindication or nondiagnostic imaging caused by motion or incomplete anatomic coverage.
  • Prior extensive gluteal filler removal that prevents mapping of the predefined compartments.
  • No operative procedure within 90 days after MRI and therefore no reference-standard assessment.
  • Acute life-threatening infection or emergency surgery that prevents completion of the preoperative reporting sequence.
  • Inability to provide consent.

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

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
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.
Paired MRI Interpretation Cohort
Each participant has the same MRI interpreted with the conventional qualitative format and with the structured anatomic classification before the index operation.
Diagnostic test: Conventional Qualitative MRI Interpretation
The report records the presence or absence of injected foreign material in the gluteal region and any routinely reported findings. A preliminary surgical plan is recorded after review of this report. Linked arm/group(s): Paired MRI Interpretation Cohort.
Diagnostic test: Structured Gluteal Filler MRI Classification
The report records material distribution and severity in predefined compartments: fat-fascia interface, subcutaneous fat, deep fascia, gluteal muscles, subcrestal region, ischial region, trochanteric region, pelvic ring, lymphatic pathways, and interstitial involvement. The final classification manual and grade definitions will be locked before enrollment. Linked arm/group(s): Paired MRI Interpretation Cohort.
Procedure: Standardized Intraoperative Anatomic Mapping
During the index operation, the surgeon documents actual involvement of each predefined compartment before reviewing the imaging accuracy analysis. Operative photographs, specimen mapping, and histopathology may support the reference standard. Linked arm/group(s): Paired MRI Interpretation Cohort.

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
Sensitivity for Surgically Confirmed Anatomic Compartment Involvement
Time Frame: Preoperative MRI interpretation and the index surgical procedure performed within 90 days after MRI. 90 days
For each reporting method, sensitivity is the number of predefined compartments identified as involved on MRI divided by the number confirmed as involved during standardized intraoperative mapping. The structured and conventional results will be compared within the same participant.
Preoperative MRI interpretation and the index surgical procedure performed within 90 days after MRI. 90 days

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
Specificity for Surgically Uninvolved Anatomic Compartments
Time Frame: Preoperative MRI interpretation and the index surgical procedure performed within 90 days after MRI. 90 dys
For each method, specificity is the number of compartments correctly identified as uninvolved on MRI divided by the number documented as uninvolved at surgery.
Preoperative MRI interpretation and the index surgical procedure performed within 90 days after MRI. 90 dys
Change in Preoperative Surgical Plan After Structured MRI Review
Time Frame: Immediately after the conventional report and immediately after the structured report, both before surgery. 1 day
Proportion of participants for whom the recorded operative plan changes after the structured report, including planned incision, extent of excision, anticipated deep-plane dissection, lymphatic evaluation, or reconstruction strategy.
Immediately after the conventional report and immediately after the structured report, both before surgery. 1 day
Surgeon-Rated MRI Report Utility
Time Frame: Immediately after review of each preoperative MRI report. 1 day
The operating surgeon rates completeness, anatomic clarity, confidence, and usefulness for planning on prespecified 0-to-10 scales after each report. Higher scores indicate greater perceived utility.
Immediately after review of each preoperative MRI report. 1 day

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.
Research Inc

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Edison Osorio, MD, plastic surgery

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)

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.
October 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.
December 1, 2026

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.
December 31, 2026

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).
September 1, 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.
September 7, 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.
September 8, 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.
September 8, 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.
September 7, 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.
September 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.
  • 007

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

no, due the privacity and informed consents signed by the patients

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.

Cookie Settings

We use cookies to ensure that we give you the best experience on our website. For more details carefully read our Privacy and Cookies Policy. ...>>>You can change your preferences or withdraw your consent at any time by deleting the cookies from your website or computer as described in the policy. Please accept it and choose your preferences by ticking the corresponding boxes in the "Manage Settings" section below. Please carefully read our Terms of Service before you proceed with using any part of this website.
«Manage Settings