RIBOSS-01: Prospective Controlled Clinical Trial to Evaluate the Safety and Effectiveness of Rib Osteotomy With Osteosynthesis Stabilization for Waist Narrowing ((RIBOSS))

July 10, 2026 updated by: Brian Ramirez, MD, MSc, Research Inc

Prospective Controlled Clinical Trial to Evaluate the Safety and Effectiveness of Rib Osteotomy With Osteosynthesis Stabilization for Waist Narrowing

The goal of this observational study is to learn about the long-term effects of RIBOSS intervention and demonstrate non-inferiority of postoperative respiratory function (FEV1, FVC, FEV1/FVC) at 6 months in the RIBOSS group compared with controls, using a non-inferiority margin of ≤0.10 L for FEV1 and FVC, and ≤0.05 for the ratio.

Study Overview

Status

Active, not recruiting

Conditions

Detailed Description

Secondary Objectives:

  • To quantify hip circumference, change and waist-hip ratio improvement.
  • To compare intraoperative and postoperative pain levels (VAS) up to 1 month.
  • To assess radiological consolidation and plate angulation at 3 and 6 months.
  • To record early and late complications (Clavien-Dindo classification) up to 12 months.
  • To measure time to return to physical activity and overall satisfaction.

Study Type

Observational

Enrollment (Estimated)

160

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

  • Colombia
    • Bogota D.C.
      • Bogotá, Bogota D.C., Colombia, 110121
        • Clinica INO

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

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

The study population will consist of adult male and female patients aged 18 to 45 years seeking elective waist narrowing through high-definition liposculpture at participating center in Bogotá, Colombia.

Eligible participants must have a body mass index (BMI) ≤30 kg/m² and demonstrate prominent projection of floating ribs (ribs XI-XII) ≥7 cm on preoperative computed tomography (CT), making them anatomically suitable candidates for structural waist modification. All participants must present with normal baseline spirometry values (FEV1, FVC, and FEV1/FVC within predicted limits) to ensure adequate pulmonary reserve prior to intervention.

Participants must be medically fit for elective surgery under general anesthesia and capable of providing written informed consent and completing patient-reported outcome measures, including the Body-QoL questionnaire.

Exclusion criteria include prior thoracic surgery or trauma, rib agenesis, osteoporosis or metabolic bone disease, c

Description

Inclusion Criteria:

  • Candidates for elective waist narrowing through high-definition liposculpture.
  • Rib XI-XII projection ≥7 cm (CT-based).
  • Baseline spirometry within predicted limits.
  • Ability to provide informed consent and complete Body-QoL questionnaire.

Exclusion Criteria:

  • Prior thoracic surgery, trauma, or rib agenesis.
  • Osteoporosis or bone metabolic disease.
  • Chronic pulmonary or systemic disease.
  • Coagulopathy or psychiatric disorder limiting adherence.
  • Pregnancy or lactation.
  • Allergy to titanium implants.

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
RIBOSS Arm (Intervention)

Rib Osteotomy with Osteosynthesis Stabilization (RIBOSS) plus liposculpture

Procedure:

2-3 cm incision 7 cm lateral to the midline over ribs XI-XII. Periosteal elevation and monocortical osteotomy using piezotome (Cube, Finapolline, France).

Controlled greenstick fracture, preserving pleura and neurovascular bundle. Internal fixation with pre-bent 1.5-mm titanium plates (MatrixRIB, Synthes) using 5-hole segments and 6-8 mm screws (two medial, two distal).

Mean angulation: 45° (ribs X-XI), 55° (rib XII). Layered closure with absorbable sutures. No corset required postoperatively.
Control Arm
Standard liposculpture (VASER and/or MicroAire-assisted) without rib osteosynthesis.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Satisfaction of body results
Time Frame: 1 day before surgery, 1 day after surgery, 7 days after surgery, 30 days after surgery, 3 months after surgery and 6 months after surgery
Body-QoL total score (0-100) from baseline to 6 months.
1 day before surgery, 1 day after surgery, 7 days after surgery, 30 days after surgery, 3 months after surgery and 6 months after surgery
Change in waist circumference (cm)
Time Frame: 1 day before surgery, 1 day after surgery, 7 days after surgery, 30 days after surgery, 3 months after surgery and 6 months after surgery
Change in waist circumference (cm), reduction of the waist circumference
1 day before surgery, 1 day after surgery, 7 days after surgery, 30 days after surgery, 3 months after surgery and 6 months after surgery

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Safety Endpoint
Time Frame: 1 week before surgery and 6 months after surgery
spirometry values (FEV1, FVC, FEV1/FVC) from before surgery to 6 months after surgery
1 week before surgery and 6 months after surgery

Collaborators and Investigators

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

Sponsor

Research Inc

Investigators

  • Principal Investigator: Hugo Aguilar, MD, plastic surgery, HAV Academy
  • Study Director: Brian Ramirez, MD, Aerospace medicine, MSc, P, Research Inc

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 (Actual)

February 20, 2026

Primary Completion (Estimated)

August 20, 2026

Study Completion (Estimated)

February 20, 2027

Study Registration Dates

First Submitted

February 21, 2026

First Submitted That Met QC Criteria

July 10, 2026

First Posted (Actual)

July 15, 2026

Study Record Updates

Last Update Posted (Actual)

July 15, 2026

Last Update Submitted That Met QC Criteria

July 10, 2026

Last Verified

July 1, 2026

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • 002 (University of CT Health Center)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

IPD Plan Description

It only be able if it is required by someone

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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