Clinical Comparison
Vacuum Bell vs Nuss Procedure — What the Evidence Actually Shows
A peer-reviewed analysis of both treatment pathways for Pectus Excavatum: outcomes, risks, recovery, and the right choice for your case — backed by over a decade of published research.
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52%
Overall success rate
15-year study · 259 patients
20+
Years of published clinical data
63%
Of pectus surgeons use VBT
as alternative to surgery
0
Surgical incisions or hospitalisation
The Core Question
For decades, the Nuss procedure (MIRPE) was the only effective treatment for Pectus Excavatum beyond observation. In 2005, Eckart Klobe introduced the silicone Vacuum Bell — and a non-surgical alternative finally had clinical credibility.
Today, peer-reviewed literature from the Journal of Chest Surgery, BMC Pediatrics, and ScienceDirect shows that both approaches can produce meaningful correction — the difference lies in how, at what cost, and for whom.
This page presents an honest, data-led comparison. We don’t dismiss surgery — for severe cases it is clinically appropriate. But for mild to moderate PE, or patients with an aversion to surgery, Vacuum Bell Therapy has earned its place as a legitimate first-line option.
“Maybe you’ve already researched the Nuss procedure — and you’re hoping there’s another way. There is.”
Medical disclaimer: This comparison is for educational purposes only and does not constitute medical advice. The appropriate treatment for Pectus Excavatum depends on individual factors including Haller Index, age, chest wall flexibility, and symptoms. Always consult a qualified thoracic specialist before making treatment decisions.
Quick Comparison
Vacuum Bell Therapy
Non-surgical · At home · Gradual · Reversible
Nuss Procedure (MIRPE)
Surgical · Hospital · Immediate · Permanent
Not sure which applies to you? Our Size Guide and consultation help determine the best path.
Head-to-Head
Every factor that matters
A complete side-by-side review across 14 clinical and practical dimensions — sourced from peer-reviewed literature and established surgical protocols.
| Factor | Vacuum Bell Therapy (VBT) | Nuss Procedure (MIRPE) |
|---|---|---|
| Type of treatment | Non-surgical — external vacuum suction device worn daily - No incisions | Minimally invasive surgery — 2 lateral incisions, metal bar inserted under sternum |
| Mechanism | Negative pressure (−100 to −200 mbar) gradually elevates the sternum and reshapes costal cartilage over months | Stainless steel bar placed retrosternally — immediately mechanically corrects the deformity |
| Correction speed | Gradual — visible improvement typically at 3–6 months; full correction at 1–3 years | Immediate — anatomical correction occurs during surgery |
| 1-year Haller Index outcome | Comparable improvement to surgery in mild–moderate cases Equivalent result | Greater absolute HI change; superior in severe PE (HI >3.5) |
| Long-term success rate | 52.1% success in compliant patients (15-year study, 259 patients — ScienceDirect 2024) | 90%+ anatomical correction in surgical candidates (multiple studies) |
| Anesthesia required | None — fully awake throughout | General anesthesia required — risks including nausea, cognitive effects |
| Hospital stay | Zero — used at home | 3–7 days inpatient (mean 3.6 days — Annals of Thoracic Surgery) |
| Recovery time | No recovery period — therapy continues normal daily activity from day one | 4–6 weeks restricted activity; contact sports banned for 3+ months |
| Pain profile | Minor skin discomfort; temporary petechiae (bruising) during early adaptation | Significant postoperative pain; 56.9% pain-free at 3 months; can persist 12–24 months |
| Complication rate | 22.8% — all minor and temporary (skin changes, redness) — BMC Pediatrics 2024 | 18–20% overall complication rate including pneumothorax, bar displacement, pleural effusion, infection |
| Foreign body implant | None | Metal bar remains in chest 2–3 years; requires second surgery for bar removal |
| Reversibility | Fully reversible — device removed at any moment | Irreversible during bar implantation period; permanent correction after bar removal |
| Cost | Device only — no surgical fees, no hospital costs, no anesthesia fees | High — surgical team, operating room, hospital stay, anesthesia, bar removal surgery |
| Best candidates | Mild to moderate PE · HI < 3.5 · Flexible chest wall · Age 6–30 · Surgery-averse patients | Severe PE · HI > 3.5 · Symptomatic patients · Rigid chest in skeletally mature adults |
Sources: Jung et al. 2021 (PMC8646059) · BMC Pediatrics 2024 (PMC10924398) · ScienceDirect 2024 · Annals of Thoracic Surgery 2016 · PMC Complications of MIRPE review
52%
VBT long-term success
259 patients · 15-year study · ScienceDirect 2024
18%
Nuss complication rate
600 MIRPE patients · ScienceDirect surgery review
26%
Avoided surgery with VBT pre-Nuss
4/15 patients avoided Nuss after VBT bridging
25%
VBT excellent correction (HI <1.5cm)
BMC Pediatrics retrospective · n=72 · 2024
Patient Selection
The right choice depends on your specific case
Neither treatment is universally superior. The clinical evidence points clearly to patient-specific factors — primarily Haller Index, chest wall flexibility, age, and symptom severity.
Vacuum Bell Therapy
Ideal candidates for VBT
Vacuum Bell Therapy is the evidence-backed first line for patients who meet these criteria:
- Haller Index below 3.5 (mild to moderate PE)
- Flexible chest wall — especially patients under 25
- Age 6 to 25 (optimal cartilage pliability window)
- No or minimal cardiopulmonary symptoms
- Preference for non-surgical, at-home therapy
- Patients on Nuss waiting lists (bridge therapy)
- PE recurrence after Nuss bar removal
- Patients preparing for surgery (pre-operative softening)
Nuss Procedure (MIRPE)
When surgery is the appropriate choice
The Nuss procedure remains the clinical standard for patients with more severe presentations:
- Haller Index above 3.5 (moderate to severe PE)
- Documented cardiopulmonary compromise
- Rigid chest wall in skeletally mature adults
- Severe cosmetic deformity causing significant distress
- VBT failure after adequate trial (>12 months compliant use)
- Highly asymmetric deformity requiring bar contouring
- Worsening deformity during adolescent growth spurt
Not sure which category applies to you? Our free consultation helps assess your Haller Index, chest wall flexibility, and the right starting point.
Beyond Either/Or
VBT and the Nuss procedure can work together
Emerging evidence shows Vacuum Bell Therapy has a significant intraoperative role — and can even reduce the need for surgery entirely.
VBT as Surgical Bridge Therapy
In 26.7% of patients undergoing VBT while awaiting the Nuss procedure, surgery was ultimately avoided entirely (ScienceDirect 2024). This makes VBT a valuable bridge — or, in successful cases, a definitive treatment.
Intraoperative Use During MIRPE
Surgeons increasingly use the Vacuum Bell device during the Nuss procedure itself — applying it to temporarily elevate the sternum and create retrosternal space, making bar insertion safer and more precise. The thoracic remodelling during VBT application is directly comparable to the post-surgical configuration (PMC8975307).
Peer-Reviewed Research
The studies behind this comparison
Every claim on this page is grounded in published, peer-reviewed research. These are the key studies informing our analysis.
Journal of Chest Surgery · PMC
Surgical vs Vacuum Bell Therapy: 1-Year Treatment Outcomes
57 patients compared directly. Both groups showed no significant difference in post-treatment Haller Index after 1 year. VBT presented as a viable alternative for surgery-averse patients.
Jung et al. — December 2021 · PMC8646059
BMC Pediatrics · Springer Nature
ì
VBT for PE: A Retrospective Case-Control Study
98 patients, 72 analyzed. 25% excellent correction, 18.1% good correction. Key predictors: initial age ≤11 and treatment duration >24 consecutive months. Complications all minor.
BMC Pediatrics 2024 · PMC10924398
ScienceDirect · Journal of Pediatric Surgery
15 Years of VBT — Long-Term Outcomes and Influencing Factors
259 patients. 52.1% success rate in completed treatment group. Overnight use and longer duration significantly improved outcomes. 26.7% of pre-Nuss patients avoided surgery.
ScienceDirect · September 2024
ScienceDirect · Journal of Pediatric Surgery
VBT Long-Term Experience at Single Centre (2012–2023)
431 patients, 278 analyzed over 11 years. Chest wall flexibility and initial depth below 1.5 cm were the strongest predictors of excellent correction (p<0.001).
ScienceDirect · October 2024
ScienceDirect · Surgical Complications Review
Complications in 600 MIRPE Patients (2005–2020)
18% overall complication rate; 3.7% intraoperative, 14.3% postoperative. Bar displacement the most frequent surgical revision cause. Rates improved with surgeon experience.
ScienceDirect · 2018 · MIRPE Complications
Annals of Thoracic Surgery
Patient Satisfaction After Nuss in Adults — Long-Term Results
98 adult patients. Mean hospital stay 3.6 days. 56.9% pain-free at 3 months. High satisfaction scores for quality of life and cosmetic result after bar removal.
Annals of Thoracic Surgery · January 2016
Where to Start
Start with the least invasive option that fits your case
For mild to moderate PE with a flexible chest wall, the evidence supports Vacuum Bell Therapy as the intelligent first step. The PectusVac device range has been engineered to match Klobe-standard specifications across all severity levels and body types.
If VBT proves insufficient after a rigorous trial, the surgical pathway remains open — and in many cases, VBT will have pre-softened the chest wall, making surgery more effective.
01
Assess your Haller Index
Mild–moderate PE (HI < 3.5) with a flexible chest wall: strong VBT candidate. Use our Haller Index Guide to understand your severity.
02
Choose the right device size
PectusVac offers Standard (19cm), Junior (16cm), Pro (22cm), and Women’s variants. Our Size Guide matches device to anatomy.
03
Follow the evidence-based protocol
Begin with 30 minutes daily, increase progressively to 2+ hours. Overnight use significantly improves long-term outcomes. Review our complete protocol.
04
Track progress — reassess at 6 months
Document changes with regular photos. Most patients see visible improvement within 3–6 months. If insufficient progress, reassess the surgical pathway with your specialist.
Common Questions
Frequently asked questions
The questions patients ask most when comparing Vacuum Bell Therapy and the Nuss procedure.
Is Vacuum Bell Therapy as effective as the Nuss procedure?
For mild to moderate Pectus Excavatum, peer-reviewed research shows comparable 1-year Haller Index outcomes between VBT and MIRPE (Jung et al., 2021 — PMC8646059). The Nuss procedure achieves a greater absolute change in HI, particularly for severe cases. However, VBT achieves equivalent functional and cosmetic results in carefully selected patients — without surgery, anesthesia, hospitalization, or a permanent metal implant.
The key is patient selection: VBT is most effective for HI below 3.5, flexible chest walls, and patients under 25. For severe PE or rigid chest walls in adults, surgery has a higher correction rate.
How long does Vacuum Bell Therapy take compared to surgery recovery?
Vacuum Bell Therapy produces gradual improvement over 6–36 months, depending on severity and compliance. There is no recovery period — patients continue normal activities from day one. The Nuss procedure achieves immediate anatomical correction but requires 3–7 days in hospital, 4–6 weeks of restricted activity, and the metal bar remains in the chest for 2–3 years before a second procedure for bar removal. Total Nuss journey: 3–4 years including both surgeries.
Can I try Vacuum Bell Therapy before deciding on surgery?
Yes — and this is clinically supported. VBT used as a bridge therapy while awaiting the Nuss procedure resulted in 26.7% of patients avoiding surgery altogether (ScienceDirect 2024). Additionally, pre-operative VBT use has been shown to soften the chest wall, potentially improving surgical outcomes and reducing operative difficulty. It is a low-risk, non-invasive option that does not compromise surgical eligibility.
What are the risks of the Nuss procedure compared to VBT?
The Nuss procedure carries a documented complication rate of 18–20% across large series (ScienceDirect MIRPE review). Common complications include pneumothorax, pleural effusion, bar displacement requiring revision, surgical site infection, and chronic postoperative pain. General anesthesia adds further risk. A second surgery is required for bar removal after 2–3 years.
VBT complications are all minor and temporary (22.8%): skin redness, petechiae (bruising), and temporary discomfort. No reports of serious VBT-related complications appear in peer-reviewed literature. Recurrence after successful VBT occurs in 2.3% of patients — significantly lower than post-surgical recurrence rates.
Is age a factor in choosing between VBT and surgery?
Age is a critical factor. VBT is most effective in patients with pliable costal cartilage — typically under 25, with optimal results in the 6–18 age range. Studies confirm that initial age ≤11 is a strong predictor of excellent correction (BMC Pediatrics 2024). As the chest wall ossifies with age, VBT becomes progressively less effective — though it can still produce improvement with prolonged use in older patients with residual chest wall flexibility.
The Nuss procedure can be performed across a wider age range including adults, though complication rates and postoperative pain are higher in adult patients compared to adolescents.
Can Vacuum Bell Therapy be used if I've already had Nuss surgery?
Yes. VBT is one of the established treatment options for PE recurrence after Nuss bar removal. The BMC Pediatrics 2024 study included 9 patients with post-Nuss recurrence who were successfully managed with Vacuum Bell Therapy. This makes VBT a valuable tool across the entire patient journey — as a first-line treatment, surgical bridge, and post-surgical maintenance option.
Does insurance or healthcare cover Vacuum Bell Therapy devices?
Coverage varies significantly by country and insurance provider. In several European countries, VBT devices may be partially reimbursable when prescribed by a specialist. The Nuss procedure, where indicated, is typically covered by national health systems or insurance for severe PE. Because VBT devices cost a fraction of the total Nuss procedure expense — even without coverage — they represent a significantly lower financial burden in most cases. We recommend consulting your insurer with a specialist’s letter confirming clinical indication for VBT.