The Most Widely Used Technique

The Case for Natural Rib Cartilage

Name: Rib Cartilage for Microtia — Why It Is the Gold Standard
Creator: Arturo Bonilla, MD
Published: 2025-01-01

Every alternative to natural rib cartilage — synthetic implants, prosthetics, donor tissue — uses material that is external to the child's own biology. This page explains why that distinction matters over a lifetime.

Grows with the child for life

Develops its own blood supply

Cannot reject — it’s their own tissue

Bends rather than fractures under trauma

No replacement required

50+ years of outcome data

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Dr. Arturo Bonilla, MD — Written & Medically Reviewed
Fellowship-Trained · Pediatric Microtia Surgeon · Pediatric Otolaryngologist · Exclusively microtia since 1996 · Last reviewed 2026 · Updated regularly

✓ Medically Reviewed

The Biology

What Exactly Is Rib Cartilage — and Why Does It Matter?

Cartilage is a specialized connective tissue found throughout the body — in your joints, nose, trachea, and ribs. Unlike bone, cartilage is flexible. Unlike soft tissue, it holds its shape. It sits in a biological middle ground that makes it uniquely suited to reconstructing structures that need both form and resilience.

Rib cartilage — the cartilage connecting the ribs to the breastbone — is the most abundant harvestable cartilage in the body. It is dense enough to be carved into precise three-dimensional anatomical forms, yet pliable enough to flex safely under normal contact. In a child aged 6 and older, ribs 6, 7, and 8 typically provide enough material to construct an entire ear framework.

Critically: rib cartilage is living tissue. It has cells (chondrocytes), a supporting matrix, and the capacity to integrate with surrounding tissue after transplantation. When placed beneath the skin at the ear site, it is accepted by the body as its own. It is not rejected. It is not tolerated. It is adopted — becoming a permanent, biological part of the child’s anatomy.

No synthetic material does this. Porous polyethylene (Medpor/Su-Por), silicone, and irradiated donor tissue are all inert — their cellular activity ends where the child’s body begins. The boundary between implant and patient is permanent. Autologous cartilage integrates fully as the patient’s own tissue.

Rib Cartilage at a Glance

The material that becomes your child’s new ear — from their own body.

Type

Hyaline cartilage — the same as found in nose and trachea

Source

Ribs 6, 7 & 8 (costal cartilage)

Harvest incision

~1¼ inches — heals to a fine scar

Living cells

Yes — chondrocytes remain viable post-transplant

Blood supply

Develops via the surrounding skin envelope

Rejection risk

None — autologous (patient’s own) tissue

Growth

Grows proportionally with the child

Longevity

Permanent — no replacement required

Clinical Advantages

Seven Clinical Advantages of Natural Rib Cartilage

These are not preferences or opinions. They are properties of living tissue that no manufactured material replicates.

🌱

It Grows With the Child

A cartilage ear framework placed at age 6 grows proportionally as the child’s face develops. By adulthood, the reconstructed ear maintains natural symmetry with the opposite ear — because it participated in the same biological growth process. A synthetic implant placed at the same age remains exactly the same size, often becoming noticeably small relative to the adult face.

❤️

It Develops Its Own Blood Supply

After placement under the skin, the cartilage framework gradually develops vascular integration with the surrounding tissue. This means the reconstructed ear has an active blood supply — it is physiologically connected to the body, not merely housed within it. This vascularization is one of the key reasons infection is far rarer and far less consequential with cartilage than with synthetic implants, where bacteria have no immune response to contend with.

✅

It Cannot Reject

The immune system’s rejection response is triggered by foreign proteins. The child’s own cartilage carries none. There is no donor mismatch, no immunosuppression, no chronic rejection risk. Once integrated, the cartilage framework is simply part of the child. This is categorically impossible to replicate with any synthetic material, regardless of how biocompatible its coating claims to be.

💪

It Bends — It Does Not Break

Cartilage is naturally flexible. Under trauma — a fall, a sports collision, any blunt impact to the ear — a cartilage ear flexes with the force and returns to its shape. It does not fracture. It does not displace. It does not require emergency surgery. Porous polyethylene implants, by contrast, are rigid plastic. Surgeons who use them routinely advise patients to wear protective headgear for contact sports — because a blow can fracture or displace the implant, requiring surgical intervention.

🌟

Native Skin on Every Visible Surface

In rib cartilage reconstruction, the cartilage framework is placed beneath the skin already present at the ear site. That skin is the child’s own — with its natural color, texture, vascular pattern, and sensation. It ages and tans alongside the rest of the face. The elevation stage does use a small full-thickness skin graft, placed behind the ear in a location not visible from the front or sides. The critical distinction is where any graft is placed. Medpor/Su-Por reconstruction requires a temporoparietal fascia flap from the scalp and a skin graft on the front of the ear — the most visible surface — which often results in permanent color and texture differences that cannot be concealed.

✅

Infection Is Rare — and Survivable

The living tissue around a cartilage reconstruction has an active immune response. If infection does occur — which is uncommon — the body’s own defenses can often contain it, and antibiotic treatment is usually sufficient. With synthetic implants, bacteria colonize the porous surface and form biofilm that antibiotics cannot penetrate.

🤝

Superior Long-Term Sensation

Because the cartilage framework sits beneath the child’s own skin — which retains its nerve connections — the reconstructed ear develops meaningful sensation over time. Patients report sensitivity to pressure, temperature, and light touch. The ear feels like theirs, because it is. Skin grafted over a synthetic implant has compromised or absent nerve supply; the tactile experience of that ear is fundamentally different, and for many patients, the ear never fully integrates into their sense of body identity the way a cartilage reconstruction does.

🔧

Revision Is Always Possible

Cartilage reconstruction remains amendable throughout life. Additional cartilage can be harvested to refine detail, add projection, or address any area where more definition is desired. Options stay open. With Medpor/Su-Por, the porous polyethylene becomes embedded in a web of fibrovascular ingrown tissue — removing or significantly revising it requires surgery that risks damaging the surrounding skin, blood supply, and nerves. The practical consequence: families who pursue synthetic implant reconstruction are betting everything on the first attempt going perfectly. With cartilage, the surgeon can always do more.

The Honest Comparison

How Living Tissue Compares to Synthetic Alternatives

The two most common alternatives to natural rib cartilage are porous polyethylene implants (Medpor/Su-Por) and ear prosthetics. Each has genuine advantages — earlier timing in the case of Medpor/Su-Por, and no surgery at all in the case of an adhesive prosthetic. These advantages are real and worth acknowledging.

But there is a fundamental category difference between what a living autologous cartilage reconstruction is and what a synthetic alternative is. A cartilage ear becomes part of the child. A synthetic alternative remains foreign to the child — managed, tolerated, or worn.

The case for cartilage is not that it is more convenient in the short term. It often requires waiting until age 6, it requires one to three surgical stages depending on grade, and it leaves a small chest scar. The case for cartilage is that it is the only option that produces an ear the child’s own body fully accepts — one that grows with them, feels like them, and requires nothing of them for the rest of their life.

The implant extrusion problem. One of the most significant clinical concerns with Medpor/Su-Por is that the implant can slowly work its way through the overlying skin — a process called extrusion. Published complication rates vary across studies — a reflection of differing follow-up durations and patient populations. Families are encouraged to review the literature and ask their surgeon directly. When extrusion occurs, the implant is often too embedded in ingrown tissue to remove cleanly. The revision options are severely limited. Cartilage reconstruction carries no equivalent risk — it does not extrude because it is not a foreign body pushing against the skin from within. Published evidence: Ma & Lloyd, J Craniofac Surg 2022 (PMID: 34643598) — systematic review reporting 15% extrusion or infection rate with Medpor versus 2% with autologous cartilage. Sharma et al., Laryngoscope 2024 (PMID: 37607106) — national database study confirming higher wound complication rates (8.6% vs. 2.8%, p = 0.037) and longer operative times (350 vs. 235 minutes) with alloplastic implants. View full research summary →

Prosthetic ears serve specific cases well — patients for whom surgery is not possible, those with prior failed reconstruction, or families who prefer a non-surgical path for their child. But the permanent attachment to a removable device — one that must be cleaned nightly, replaced every few years, and cannot sweat or tan alongside the rest of the face — is a fundamentally different relationship with one’s own appearance than having a permanent biological ear.

Natural Rib Cartilage

✓Living tissue — grows with the child

✓Patient’s own biology — zero rejection

✓Develops blood supply — immune response intact

✓Bends under trauma — does not fracture

✓Native skin covers ear — natural color & texture

✓No scalp surgery — no fascia flap required

✓No extrusion risk — not a foreign body

✓Sensation preserved — nerve supply intact

✓Revision always possible with more cartilage

✓Permanent — no replacement, ever

✓50+ years of long-term outcome data

Medpor/Su-Por Implant

✗Synthetic — does not grow with child

✗Foreign body — permanent boundary with tissue

✗No immune response — biofilm colonization risk present

✗Rigid — vulnerable to fracture under trauma; displacement may require surgical intervention

✗Skin graft required — color and texture mismatch

✗Scalp fascia flap — independent surgery with own risks

✗Exposure risk persists for life — 6.97% higher rate vs. rib cartilage per 2025 meta-analysis

✗Flap tissue — sensation variable, often limited

✗Revision extremely difficult — ingrown tissue

✗Implant may need replacement due to complications

✗Less long-term data — technique is newer

What happens if the Medpor/Su-Por implant fails?

→The porous polyethylene becomes embedded in fibrovascular ingrown tissue — this is by design, as ingrowth is what stabilizes it.

→When complications require removal, the ingrown tissue must be separated from surrounding skin, blood vessels, and nerves — a high-risk procedure.

→After failed implant removal, the available skin and tissue is often too compromised for rib cartilage salvage reconstruction.

→The family’s options narrow significantly. The first attempt is often the only good attempt.

Lifetime Result

Long-Term Results — No Maintenance or Replacement Required

After the third and final stage of reconstruction is complete, the cartilage ear requires no maintenance, no follow-up procedures, no monitoring, no replacement. It simply lives as part of the child — growing, aging, and adapting alongside them.

Stage 1

Cartilage harvested & ear framework placed under skin

Stage 2

Earlobe, tragus & conchal detail refined

Stage 3

Ear elevated to permanent projected position

Done

Reconstruction Complete

No further surgery. No follow-up. No replacement.

∞

Lifelong

The ear grows, ages, and lives as a permanent part of the child

What “permanent” actually means

✓No replacement timeline — unlike prosthetics (2–7 year cycles) or implants that may fail

✓No daily removal — the ear is always there, not something worn and stored

✓No color drift — the skin ages naturally with the rest of the face

✓No implant surveillance — no annual checks for extrusion or degradation

✓No activity restriction — sports, swimming, and physical contact carry no long-term risk

✓No secondary surgical site — no scalp incisions, no fascia flap complications

The Rib Harvest Scar — What Families Should Know

The most frequently cited disadvantage of rib cartilage reconstruction is the chest incision required to harvest the cartilage. This is a real consideration and deserves an honest answer.

Dr. Bonilla’s technique uses a single incision approximately 1¼ inches long, placed low on the lateral chest wall where the ribs are most accessible. The incision is closed in layers and heals into a fine, faded line — typically covered by clothing and nearly imperceptible within a few years.

In more than 30 years of practice and thousands of reconstructions, Dr. Bonilla reports that virtually no patient has expressed regret about the rib scar. When asked, patients and families describe a clear and consistent sentiment: the scar is a small trade for a permanent, living ear. It is the mark of something built — not purchased, not borrowed, not implanted. For most patients, it carries no negative psychological weight. For some, it carries meaning.

The comparison that matters: a 1¼ inch chest scar that fades to near-invisibility, versus a lifetime of implant surveillance, scalp flap scarring, potential hair loss at the incision site, and the persistent risk that the implant one day needs to be removed.

Dr. Bonilla’s Position

Why He Has Used Only This Technique for 30 Years

“I only perform rib cartilage reconstruction because I believe — after thirty years and thousands of cases — that it produces the most durable outcome for the patient across their lifetime. Not the fastest result. Not the one with the smallest initial scar. The best lifetime outcome. ”

Dr. Arturo Bonilla, MD

Fellowship-trained Pediatric Otolaryngologist — Exclusive microtia practice since 1996
Founder, Microtia & Congenital Ear Institute, San Antonio, TX

What “exclusive” means

Dr. Bonilla does not use Medpor/Su-Por as the ear reconstruction framework. He does not offer cadaver cartilage. He does not rotate between techniques based on which one a family requests. This is a deliberate clinical position — not a limitation of his practice, but a conviction about what produces the best outcome. The reconstructed ear itself is always built entirely from the child’s own natural rib cartilage. Dr. Bonilla does use a small Su-Por wedge — which he designed — placed entirely behind the cartilage framework during Stage 3 elevation to maintain projection permanently. It is not visible, forms no part of the ear structure, and lies fully protected behind the natural cartilage ear.

A surgeon who performs the same technique exclusively at high volume develops a level of refinement that concentrated repetition makes possible. Dr. Bonilla's practice is built on this principle.

His assessment of alternatives

Dr. Bonilla reviews the literature on synthetic implants and stays current with published outcomes data. He acknowledges the genuine advantage of earlier surgical timing that Medpor/Su-Por allows. He does not dismiss families who consider it.

His conclusion after three decades of observation: the long-term complication profile of synthetic implants — extrusion, infection, revision difficulty, growth asymmetry — produces outcomes that, in his clinical judgment, do not serve the patient as well as living cartilage does across a lifetime. That is his honest assessment.

The Clinical Record

Fifty Years of Evidence for Rib Cartilage Reconstruction

The technique Dr. Bonilla uses has been refined and documented since the 1960s. No other microtia reconstruction approach has comparable long-term data.

1960s–1980s

Tanzer and Brent Establish the Foundation

Radford Tanzer developed the staged rib cartilage reconstruction technique. Robert Brent refined and systematized it, publishing extensive 20–30 year follow-up data demonstrating stable, well-maintained results into adulthood. This remains the foundational evidence base.

1990s

Nagata Refines for Greater Anatomical Detail

Satoru Nagata published refinements to cartilage framework carving technique and stage management, demonstrating that greater anatomical precision was achievable. The Nagata technique influenced an entire generation of microtia surgeons including Dr. Bonilla.

2000s–2010s

Long-Term Comparisons Favor Cartilage

As Medpor/Su-Por gained adoption in the 1990s, comparative studies began accumulating. Long-term follow-up consistently showed higher complication rates, more revision surgeries, and lower patient satisfaction scores with synthetic implants compared with autologous cartilage reconstruction.

Current

Clinical Evidence and Global Adoption

Autologous rib cartilage reconstruction is currently endorsed as the first-line approach by the American Academy of Otolaryngology and major academic medical centers worldwide. The weight of evidence — 50+ years of documented outcomes — is unmatched by any alternative technique.

Dr. Bonilla

Thousands of Cases Over 30 Years

Dr. Bonilla’s own published clinical outcomes contribute to this evidence base. With thousands of rib cartilage reconstructions — performing this surgery and only this surgery — his case volume and outcome data represent a high-volume single-surgeon series representing one of the largest published cartilage case records.

Key Insight

Volume and Specialization Drive Outcomes

The cartilage technique rewards surgical experience more than almost any procedure in reconstructive surgery. Framework carving is an art that improves with repetition. Surgeons who perform this exclusively, at high volume, produce results that occasional practitioners cannot replicate regardless of technical training.

Frequently Asked Questions

Questions Families Ask About Cartilage Reconstruction

Why does my child have to wait until age 6? Can’t you start earlier? +

The wait until approximately age 6 is not a conservative preference — it is a biological requirement. Sufficient rib cartilage must be available to harvest and carve into an ear framework that will be appropriately proportioned relative to the adult face your child will grow into. If surgery is performed too early, the resulting ear may be technically correct at age 5 but undersized by age 20. Dr. Bonilla assesses rib cartilage development individually at consultation — a well-developed 5-year-old may have sufficient cartilage, while a smaller 7-year-old may need to wait another year. The timing decision is always individualized. For families who wish to begin before age 6, Medpor/Su-Por allows earlier surgery but at the cost of the significant long-term advantages cartilage provides.

Does removing rib cartilage weaken the chest wall or cause long-term problems? +

No. The costal cartilage Dr. Bonilla harvests — from ribs 6, 7, and 8 — regenerates partially over time. The chest wall is not structurally compromised. Children who have had cartilage harvested participate fully in sports, physical activity, and normal life without restriction. The small harvest site does not create a detectable deformity in the vast majority of cases. In more than 30 years and thousands of procedures, Dr. Bonilla has not seen lasting chest wall complications from cartilage harvest.

How visible is the chest scar after cartilage harvest? +

The harvest incision is approximately 1¼ inches long, placed on the lower lateral chest. It is closed meticulously in layers and heals over the following months into a fine, faded line. By two to three years after surgery, it is typically very difficult to see. It is always below the neckline and covered by clothing, including swimwear in most cases. In Dr. Bonilla’s experience, patients virtually never express concern about the scar in the years following reconstruction — they consistently regard it as a small and entirely worthwhile trade.

Can my child play contact sports after cartilage reconstruction? +

Yes — after each recovery period, there are no long-term activity restrictions. Children who have had rib cartilage reconstruction swim, play soccer, wrestle, play basketball, and engage in all sports without restriction. Because the cartilage is flexible, it bends under impact rather than fracturing or displacing. This is one of the most important practical advantages over synthetic implants, which are rigid plastic — surgeons who use Medpor/Su-Por routinely recommend protective headgear for contact sports because trauma can fracture or displace the implant.

What if the reconstruction needs to be changed or improved later? +

Cartilage reconstruction remains revisable throughout life. Additional cartilage can be harvested and used to refine detail, add definition, or address any area where the patient wants improvement. The skin envelope retains its full vascular supply, so future work is technically feasible. This is in sharp contrast to synthetic implant reconstruction, where the porous polyethylene becomes embedded in fibrovascular ingrown tissue — revision requires separating the implant from this tissue at significant risk to surrounding structures. With cartilage, options stay open indefinitely.

Will the reconstructed ear look exactly like a normal ear? +

Rib cartilage reconstruction produces ears with full anatomical form — all major structures of a normal ear are present and visible: helix, antihelix, conchal bowl, tragus, antitragus, and earlobe. In experienced hands, the result is a natural-looking ear that blends with the face. It will not be identical to the opposite ear — no biological reconstruction can guarantee mirror symmetry — but it is designed to harmonize with it, and the cartilage grows proportionally as the child develops. Dr. Bonilla’s results across thousands of cases are documented on this site and discussed candidly at every consultation.

My child was previously told to do Medpor/Su-Por. Can we switch to cartilage? +

If your child has not yet had surgery, yes — consultation with Dr. Bonilla is appropriate and he will give you a complete assessment. If your child has already had Medpor/Su-Por surgery and you are considering revision, the situation is more complex. Whether rib cartilage reconstruction is feasible depends on the condition of the existing skin and tissue, how the implant has integrated, and what revision options remain. Dr. Bonilla sees a meaningful number of patients seeking revision after prior Medpor/Su-Por reconstruction and evaluates each case individually. He can discuss what is and is not possible at consultation.

Request a Consultation

Dr. Bonilla consults with families worldwide via telehealth. To get started, submit your information through the contact form and his team will reach out to schedule a virtual consultation. He will review your child’s grade, rib cartilage development, and candidacy, and give you a direct, honest assessment of what reconstruction would look like.

Request a Consultation With Dr. Bonilla Call (210) 477-3277 The Surgical Technique