If you have been researching waist reduction surgery in Australia, you may have come across terms such as “rib reshaping surgery”, “floating rib surgery” or “rib remodelling”. This guide explains what the procedure involves, how the modern ultrasonic technique works, what the published research reports, and what the Australian patient pathway looks like — in plain, practical English.
The anatomy: which ribs are involved?
Most people have twelve pairs of ribs. The upper seven pairs are “true ribs” — each connects directly to the breastbone (sternum) by its own cartilage. Below them sit two groups relevant to this procedure:
- False ribs (ribs 8–10). These do not reach the breastbone directly. Instead, their cartilage joins the cartilage of the rib above, forming the lower border of the rib cage at the front.
- Floating ribs (ribs 11–12). These are shorter and attach only to the spine at the back. Their front ends sit free within the muscles of the abdominal wall, which is why they are called “floating”.
Because the floating ribs — and to a lesser degree the lower false ribs — flare outward at the level of the natural waist, their position influences how narrow the waist can be. In some people, particularly those with an “H-shaped” torso and low body fat, the skeletal frame itself sets the limit on waist circumference, and no amount of diet, exercise or fat-reduction treatment will change the underlying bone structure.
Rib remodelling typically targets ribs 10–12. Some technique variants also mobilise ribs 8–9; these are more extensive procedures and are discussed separately in the published literature.
How does the ultrasonic technique work?
The most widely published modern approach uses a piezoelectric (ultrasonic) instrument. Rather than cutting through the whole rib, the instrument is used to create a controlled monocortical fracture — sometimes called a “greenstick-type” fracture — of the outer layer (cortex) of the rib only. The inner cortex and the periosteum (the membrane surrounding the bone) remain intact.
Think of bending a green tree branch: the outer surface gives way while the branch stays in one piece. Once the outer cortex has been weakened at planned points, the surgeon can bend the rib inward toward the body’s midline.
Key features of the technique as described in the literature:
- It is performed under general anaesthesia administered by a specialist anaesthetist.
- The instrument is guided by real-time ultrasound imaging, allowing the surgeon to see the rib, the instrument and the underlying structures throughout.
- Access is through small access points — reported sizes range from 1–2 mm up to roughly 2 cm depending on the technique. These are small, but they are real incisions and leave scars; honest scar information is part of any proper consultation.
- Operating time is typically around 45–60 minutes, performed as day surgery or with a one-night stay.
- A pre-operative CT scan is used to map the individual’s rib anatomy before surgery.
After the ribs are repositioned, they need to heal — or consolidate — in the new inward position. In most published protocols this is supported by a rigid corset worn approximately 23 hours a day for about 8–12 weeks (technique-dependent; 8 weeks is a typical minimum and some protocols extend to 6 months). One published variant uses small internal plates (osteosynthesis) to hold the ribs instead of a corset. Consolidation is the reason the corset protocol matters so much: in pooled data, the small number of asymmetry cases reported was mostly linked to corset non-compliance.
Recovery milestones reported in the literature and by practices include a return to desk work at around 1–2 weeks, bruising settling over about 4 weeks, swelling resolving over 4–8 weeks, a return to strenuous exercise and heavy lifting somewhere between 6 weeks and 3 months, and the final contour becoming apparent at 3–6 months. You can read more on our recovery page.
What rib remodelling is not
It is not rib removal. Traditional rib resection — an older operation — removed segments of the lower ribs entirely. Remodelling deliberately keeps every rib: the bone is fractured on one side only, bent inward and allowed to heal. No bone is taken out. If you want a detailed comparison, see our article on rib remodelling versus rib removal.
It is not a weight-loss procedure. It changes the position of bone, not the amount of body fat. Published patient cohorts have been at healthy weights (mean BMI around 22 in the pooled analysis), and candidacy criteria generally include a stable weight and a BMI below roughly 28–30.
It is not minor surgery. Despite the small access points, this is an operation on the rib cage under general anaesthesia, close to the pleura (the lining of the lungs). It carries genuine risks, described below and in full on our risks page.
Who performs rib remodelling in Australia?
Rib remodelling is an established, published surgical technique. It has appeared in the peer-reviewed literature since 2021, with international case series, systematic reviews and, in 2025, a pooled meta-analysis of 318 patients. Internationally it is performed by plastic surgeons; in Australia it is performed exclusively by FRACS specialist plastic surgeons — Fellows of the Royal Australasian College of Surgeons in Plastic and Reconstructive Surgery — who hold specialist registration with the Medical Board of Australia, are fully insured, and operate at accredited facilities with general anaesthesia administered by specialist anaesthetists.
Since Australia’s 2023 reforms, “surgeon” is a protected title that only practitioners with specialist registration in surgery (including plastic surgery), ophthalmology or obstetrics and gynaecology may use — even so, it is worth verifying any practitioner’s specialist registration yourself on the AHPRA public register at ahpra.gov.au.
You can read more about who performs the procedure on our surgeons page.
What outcomes does the research report?
The most useful summary comes from a pooled meta-analysis published in Aesthetic Plastic Surgery (Springer) in 2025, which combined four studies covering 318 patients (98.1% women, mean age 32.7, mean BMI 22.4). It reported:
- a mean waist reduction of 8.59 cm at 3 months (95% confidence interval 6.92–10.27 cm);
- a mean satisfaction score of 94.89 out of 100;
- no pneumothorax cases (0.00 per 100 patients; 95% CI 0–0.66) and no infections in the pooled data;
- skin burns in 0.57 per 100 patients and asymmetry in 1.85 per 100 — the latter largely associated with corset non-compliance, a factor in the patient’s hands.
The safety picture holds up across much larger numbers, too. In the largest global dataset compiled to date — 2,351 cases — serious complications such as pneumothorax were rare, at just 0.17%. Notably, the more serious complications recorded in the older surgical literature cluster around the obsolete rib-resection approach, not modern remodelling.
Individual studies report a range of results — from around 8 cm with the greenstick method to larger reductions with more aggressive technique variants. Outcomes vary between individuals. For a full walk-through of every major study, see what the research actually says about rib remodelling.
What are the risks?
Rib remodelling is surgery, and all surgery carries risk. Possible complications include pneumothorax (collapsed lung), bleeding, infection, nerve injury and ongoing pain, asymmetry, scarring, and risks associated with general anaesthesia. Outcomes vary from person to person. Read our full risk information before considering this procedure.
Other reported risks include seroma, skin burns from ultrasonic devices (around 0.6% in pooled data), under- or over-correction — one series reported up to 14% of patients requiring a secondary procedure for insufficient correction — delayed union or non-union of the ribs, and deep vein thrombosis or pulmonary embolism. Read about the risks of rib remodelling in full before going any further in your research.
The Australian pathway
Australian regulations require a referral from your GP or another independent medical practitioner, at least two pre-operative consultations (including one in person with your surgeon), screening for body dysmorphic disorder, and a minimum 7-day cooling-off period after informed consent before surgery can be booked. Rib remodelling is not available to people under 18.
Candidacy is assessed individually, but published consensus points to healthy adults aged 18 or over, ideally with a BMI under about 28–30, a stable weight, non-smoking status (or ceasing at least six weeks before surgery), adequate bone quality (a bone-density check is often considered over about age 40), realistic expectations, and the ability to commit to the corset protocol. Pregnancy or breastfeeding, bleeding disorders, significant respiratory or spinal disease, active infection, poor bone density, smoking and concerns identified on body dysmorphic disorder screening are contraindications. A full description of the operation itself is on our procedure page.
If reshaping the frame of your waist is what you have been looking for, the most useful next step is a conversation with a specialist. Request a consultation to discuss your anatomy, your goals and whether rib remodelling is right for you.
Frequently asked questions
Does rib remodelling remove any ribs?
No. The ribs are preserved. The technique creates a controlled fracture of the outer cortex only, allowing each rib to be bent inward, where it consolidates over roughly 8–12 weeks. Nothing is removed from the body.
How much waist reduction is realistic?
The pooled 2025 meta-analysis of 318 patients reported a mean reduction of 8.59 cm at 3 months (95% CI 6.92–10.27 cm). Larger figures reported for aggressive technique variants are upper bounds, not typical results. Outcomes vary between individuals.
Is rib remodelling permanent?
The ribs consolidate in their new position and the change is intended to be long-lasting. Consolidated bone is stable tissue; published follow-up currently runs to six months, with longer-term data accumulating.
Medical review: This article is general information only and does not replace a consultation with a specialist plastic surgeon. Rib remodelling carries risks — read them at /risks/. All surgery requires a GP referral, two consultations and a mandatory cooling-off period.
References
Pooled meta-analysis, Aesthetic Plastic Surgery (Springer), 2025: https://link.springer.com/article/10.1007/s00266-025-05240-w
Kudzaev greenstick method, PRS Global Open, 2021: https://journals.lww.com/prsgo/fulltext/2021/07000/waist_narrowing_without_removal_of_ribs.9.aspx
Systematic review, RBCP: https://www.rbcp.org.br/details/3632/