What This Guide Covers and Who It Is For
This guide explains distraction osteogenesis, a bone-lengthening surgery performed by oral and maxillofacial surgeons to correct severe jaw deficiency.
If you or your child has a jaw that is significantly shorter than normal, conventional surgery may not add enough length. Traditional bone grafting can move bone only a limited distance, and large grafts carry a higher risk of failure. Distraction osteogenesis solves this problem by coaxing the body into growing its own new bone across a gradually widening gap. The result is living, natural bone rather than a transplanted segment.
This guide is for patients and parents considering the procedure. It covers how the technique works, what the recovery timeline looks like, how much it may cost, and when to seek a specialist. Whether the jaw deficiency is present from birth or the result of an injury, the core principles are the same.
The procedure is performed by oral and maxillofacial surgeons who have specific training in craniofacial reconstruction. In many cases a team approach involving orthodontists, pediatric anesthesiologists, and speech therapists produces the best outcome. [1]
How Distraction Osteogenesis Works
Distraction osteogenesis uses the body's natural healing response to generate new bone across a controlled gap in the jaw.
The Biological Principle Behind Bone Distraction
When a bone is cut and the two ends are slowly pulled apart, the body responds by filling the space with new bone tissue. This biological process is called osteogenesis, which literally means "bone creation." The concept was first developed in orthopedic limb lengthening and later adapted for the facial skeleton.
A surgeon first performs an osteotomy (a precise, planned cut through the bone). A distraction device is then attached across the cut. After a short healing pause, the device is activated a small amount each day, typically about 1 millimeter. That daily separation triggers a cascade of cellular activity. Blood vessels grow into the gap, and bone-forming cells called osteoblasts lay down new bone along the tension zone.
Because the bone grows at the body's own pace, the surrounding soft tissues, including muscles, nerves, and blood vessels, stretch and adapt along with the bone. This is one of the major advantages over a single large bone graft, which can put sudden strain on soft tissues. [1]
The Three Phases of Treatment
Treatment follows three distinct phases, each serving a specific biological purpose.
The first is the latency phase. This lasts about 5 to 7 days after surgery. During this time the body forms a soft callus (an initial bridge of healing tissue) at the osteotomy site. No turning of the device occurs during latency. The goal is to establish a blood supply and a foundation of early repair tissue.
The second is the active distraction phase. The patient or a caregiver turns the device a prescribed amount each day, usually in two to four small increments totaling about 1 millimeter. This phase lasts 2 to 4 weeks depending on how much lengthening is needed. For example, moving the jaw forward 20 millimeters would require roughly 20 days of activation.
The third is the consolidation phase. Once the target length is reached, the device stays in place without further turning for 8 to 12 weeks. During this time the soft new bone (called regenerate bone) gradually mineralizes and hardens into mature bone. Premature removal of the device during consolidation can lead to relapse, so follow-up imaging is essential before the surgeon removes the hardware.
Conditions Treated with Jaw Distraction
Distraction osteogenesis is most commonly used for conditions where the jaw is significantly underdeveloped or has lost substantial bone.
Hemifacial microsomia is one of the most frequent indications. In this condition, one side of the lower jaw (mandible) is much smaller than the other, leading to facial asymmetry. Distraction can lengthen the short side to match the unaffected side.
Pierre Robin sequence involves a very small lower jaw (micrognathia), a tongue that falls backward (glossoptosis), and often a cleft palate. In severe cases the tongue blocks the airway. Mandibular distraction can pull the jaw and tongue forward, relieving the obstruction and sometimes avoiding the need for a tracheostomy (a surgically created breathing hole in the neck). [1]
Other indications include Treacher Collins syndrome, jaw deficiency after trauma, and bone gaps left by tumor removal. In adults, mandibular or midface distraction may also be considered when the bone deficiency is too large for conventional orthognathic (jaw repositioning) surgery to correct safely.
Types of Distraction Devices
Two main categories of devices exist: internal and external. Each has trade-offs in terms of comfort, versatility, and visibility.
Internal (buried) devices are placed entirely beneath the skin and attached to the bone with screws. A small activation arm pokes through the gum or skin so the patient or caregiver can turn it. Internal devices are less visible, carry a lower risk of pin-site infection, and are generally more comfortable. However, they can only move bone in one direction (a straight line), and they require a second minor surgery for removal.
External devices have pins that pass through the skin into the bone and connect to a frame outside the face. They are bulkier and more noticeable, but they offer the ability to adjust the direction of movement during treatment. This makes them useful for complex three-dimensional corrections. Pin-site care is important to prevent infection.
The surgeon selects the device type based on the direction and amount of bone movement needed, the patient's age, and the anatomy of the deficiency. In many pediatric airway cases, internal devices are preferred to reduce the risk of accidental dislodgement. [1]
Practical Details: Age, Timing, and Preparation
Knowing what to expect before surgery helps patients and families prepare physically and emotionally.
Age and Timing of Surgery
One of the remarkable features of distraction osteogenesis is that it can be performed at nearly any age. Infants with Pierre Robin sequence who have life-threatening airway obstruction may undergo mandibular distraction within the first few weeks or months of life. In these urgent cases, the benefits of restoring the airway typically outweigh the risks of early surgery.
For conditions like hemifacial microsomia, the timing is more flexible. Some surgeons prefer to operate early (around age 4 to 6) to promote symmetric jaw growth. Others wait until the child is older and jaw growth is more complete to reduce the chance of needing a second procedure. There is no single "best" age; the decision depends on the severity of the deformity, airway status, psychosocial factors, and the surgeon's clinical judgment. [1]
In adults, distraction osteogenesis may be recommended when the jaw deficiency exceeds what standard orthognathic surgery can safely correct, typically when more than 10 to 15 millimeters of advancement is needed.
How to Prepare for Surgery
Preparation begins with imaging. A CT scan (computed tomography) creates a three-dimensional model of the jaw so the surgeon can plan the exact location of the bone cut and the position of the device. In some centers, virtual surgical planning software is used to design custom cutting guides and even patient-specific devices.
Orthodontic work may be needed before or after distraction to align the teeth with the new jaw position. Your surgeon and orthodontist will coordinate the overall treatment sequence.
General health screening is standard before any procedure requiring general anesthesia. Blood tests, a physical exam, and a review of medications will occur in the weeks before surgery. If your child is the patient, the anesthesia team will assess airway anatomy carefully, especially if the reason for surgery is airway obstruction.
Patients are typically asked to stop blood-thinning medications, avoid eating or drinking after midnight the night before surgery, and arrange transportation home. For pediatric patients, bring comfort items and plan for a hospital stay of one to three nights.
What Happens During and After the Procedure
The surgical phase takes a few hours under general anesthesia, but the full treatment spans several months.
The Day of Surgery
The procedure is performed under general anesthesia in a hospital operating room. The surgeon makes an incision inside the mouth or, less commonly, through the skin beneath the jaw. The bone is exposed, and the osteotomy is made using specialized saws or piezoelectric instruments (ultrasonic cutting tools that are precise and gentle on soft tissues).
The distraction device is secured to the bone segments with titanium screws. The surgeon then tests the device by turning it slightly to confirm the segments separate properly and move in the planned direction. The wound is closed with dissolving stitches. The total operating time typically ranges from 1 to 3 hours depending on whether one or both sides are treated.
Most patients stay in the hospital for one to three nights. Infants undergoing airway distraction may stay longer for monitoring. Pain is managed with prescription medication and typically decreases significantly within the first week.
Activating the Device at Home
After the latency phase (5 to 7 days), the surgeon will instruct you on how to activate the device. For internal devices, a small wrench-like key is inserted into the activation arm and turned a specific number of clicks. For external devices, a similar mechanism on the external frame is used.
Each activation session takes less than a minute. Most protocols call for two to four turns per day spaced evenly apart. A common schedule is 0.5 millimeters in the morning and 0.5 millimeters in the evening. You will record each activation in a log provided by the surgical team.
Some discomfort or a feeling of tightness is normal after each turn. This typically fades within 30 minutes. If pain is severe or the device will not turn, contact the surgeon's office rather than forcing it. Weekly or biweekly follow-up appointments allow the surgeon to check progress with X-rays and adjust the plan if needed.
Consolidation and Device Removal
Once the jaw reaches its target position, the device is locked in place. The consolidation phase lasts 8 to 12 weeks. During this time, the regenerate bone matures from soft woven bone into stronger lamellar bone.
You will continue follow-up visits so the surgeon can monitor bone density on X-rays. A diet of soft foods is usually recommended throughout the distraction and consolidation phases to avoid stressing the new bone.
Device removal is a shorter procedure, typically performed under a brief general anesthetic or deep sedation. Internal devices require a small incision to access the hardware. External device pins are unscrewed and removed, and the pin sites heal over the following week. Most patients return to normal activity within a few days of device removal.
Risks and Potential Complications
Like any surgical procedure, distraction osteogenesis carries risks. Common issues include temporary numbness of the lower lip (due to stretching of the inferior alveolar nerve), pin-site infection with external devices, and mild scarring.
Less common but more serious complications include premature consolidation (bone hardens before the target length is reached), device loosening, unfavorable direction of bone growth (called a vector problem), and relapse (partial loss of the gained length after device removal). In published case series, complication rates vary widely depending on patient age, condition severity, and device type.
Tooth buds in children can occasionally be damaged during the osteotomy. Careful preoperative imaging helps the surgeon plan bone cuts that avoid developing teeth. Open communication with your surgical team about any unusual symptoms during treatment is the best way to catch and manage complications early. [1]
Cost Ranges and Insurance Considerations
Total treatment costs for jaw distraction osteogenesis typically range from $15,000 to $50,000. Costs vary by location, provider, and case complexity.
Several factors influence where a case falls within that range. Surgeon and anesthesia fees make up a substantial portion. Hospital or surgical center facility fees depend on the length of stay. The distraction device itself can cost several thousand dollars; custom or patient-specific devices tend to be more expensive than off-the-shelf models. If orthodontic treatment is part of the plan, those fees are usually billed separately.
Insurance coverage is common when the procedure is deemed medically necessary. Conditions like Pierre Robin sequence with airway obstruction, hemifacial microsomia causing functional problems, and post-traumatic jaw deficiency typically qualify. Insurance approval often requires documentation including clinical photos, imaging, sleep studies or airway assessments, and a letter of medical necessity from the surgeon. [1]
Purely cosmetic indications are less likely to be covered. If you are uncertain about your coverage, request a predetermination (a written estimate of benefits) from your insurance company before scheduling surgery. The surgeon's billing coordinator can usually help with this process.
When to See an Oral and Maxillofacial Surgeon
A referral to an oral and maxillofacial surgeon is appropriate whenever a significant jaw size discrepancy affects function, breathing, or facial balance.
Your general dentist, pediatrician, or orthodontist may be the first to notice signs that the jaw is severely underdeveloped. In children, warning signs include persistent difficulty feeding, noisy breathing or snoring, an obviously recessed chin, or a large open bite that braces alone cannot fix. In adults, signs include severe obstructive sleep apnea linked to a small jaw, facial asymmetry from a prior fracture, or a bone defect after tumor surgery. [2]
Not every small jaw requires distraction osteogenesis. Mild to moderate deficiencies may be correctable with standard orthognathic surgery or orthodontic camouflage. A specialist evaluation determines which approach fits the anatomy. If the bone needs to move a large distance, or if the patient is very young, distraction osteogenesis may be the most appropriate option.
Seek an oral and maxillofacial surgeon who regularly performs craniofacial distraction. Ask about the number of cases they have completed, the types of devices they use, and whether they work within a multidisciplinary craniofacial team. A team approach, including orthodontics, speech therapy, and sometimes pulmonology, typically produces more predictable results.
Find a Qualified Oral and Maxillofacial Surgeon
If you or your child may benefit from distraction osteogenesis, the next step is a consultation with a qualified specialist. Use our directory to search for an oral and maxillofacial surgeon near you who has experience in craniofacial reconstruction and jaw distraction procedures. A thorough evaluation, including imaging and a review of medical history, will help determine whether this technique is the right fit for your specific situation.
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