Safety of Limb Lengthening – Complications, Their Causes, and Prevention

Limb lengthening is a surgical procedure that can significantly improve quality of life—both for medical reasons (e.g., limb length discrepancy, deformities) and cosmetic reasons (desire to increase height). However, like any orthopedic surgery, it carries potential risks that the patient should be aware of and understand. Thanks to the experience of the surgical team and the appropriate care provided at the PALEY EUROPEAN Institute, the risk of serious complications is low, and most complications can be effectively prevented or treated.

1. Fat Embolism

One possible complication during a limb-lengthening procedure is fat embolism. When preparing the bone for the insertion of an intramedullary nail, the surgeon must clean and widen the medullary canal (a process known as reaming). This process increases pressure within the bone, which can cause tiny fat particles from the bone marrow to enter the bloodstream and be trapped in the lungs—this is known as a fat embolism.

In most cases, small amounts of fat are well tolerated and do not cause any symptoms. However, larger amounts can lead to shortness of breath, decreased oxygen saturation, and the need for oxygen via a mask or nasal cannula.

In rare, severe cases, treatment in an intensive care unit is necessary—though such situations are extremely rare. To minimize the risk, measures include the use of special surgical instruments, techniques to reduce pressure within the spinal canal, and close monitoring of the patient’s vital signs during surgery.

2. Deep vein thrombosis (DVT) and pulmonary embolism (PE)

After any orthopedic surgery, there is a risk of blood clots forming in the deep veins of the lower limbs—a condition known as deep vein thrombosis (DVT). If a clot breaks loose and travels through the bloodstream to the lungs, it can lead to a pulmonary embolism (PE), which is a serious life-threatening condition.

To significantly reduce this risk, patients undergo routine anticoagulant prophylaxis—such as taking low-dose aspirin or other anticoagulant medications, depending on individual indications. Proper prophylaxis and early mobilization of the patient after surgery significantly reduce the incidence of DVT and PE.

3. Premature bone healing

During bone lengthening, the healing process is controlled—the bone is gradually pulled apart, which stimulates the body to form new bone tissue. Sometimes the bone heals faster than it is being pulled apart, a condition known as premature union.

This may halt the lengthening process. In such cases, the surgeon may: temporarily increase the rate of distraction, or perform a minor re-osteotomy (re-cutting of the bone) to continue the lengthening.

Careful planning of the stretching rate and precise process control tools help minimize this complication.

4. Delayed or incomplete bone healing (Delayed / Failure of Consolidation)

On the other hand, during the lengthening process, bone healing may proceed more slowly than expected, or, in extreme cases, union may not occur. Factors contributing to this include osteoporosis, low vitamin D levels, smoking, certain medications, and other systemic conditions.

To prevent this, patients are often given vitamin D supplements and other supportive treatments, and wound-healing techniques are also used. In most cases, even if healing is delayed, the consolidation phase proceeds without the need for reoperation.

5. Nerve damage during lengthening

The nerves running along the bone may be at risk of being stretched during the bone-lengthening process. This risk increases if the rate of lengthening exceeds approximately 1 mm per day.

Common symptoms of nerve irritation include tingling, numbness, or muscle weakness. This most often affects the peroneal nerve in the shin area. If symptoms appear, the stretching pace is immediately reduced, and if necessary, a minor surgical procedure is performed to decompress the nerve.

In the case of some small nerves, such as those in the toes, the damage may resolve on its own without the need for additional treatment.

6. Muscle spasms and soft tissue contractures

Muscles and fascia respond to gradual bone lengthening by contracting. If the tension is too great or joint mobility is not properly monitored, spasms or contractures may develop, limiting the range of motion in the joints.

Physical therapy, both at the center and through independent exercises at home, is essential for maintaining a full range of motion, preventing contractures, and shortening the rehabilitation period.

Failure to undergo physical therapy during the lengthening process may lead to permanent limitations that will require additional treatment.

7. Complications related to the fibula

During tibial lengthening, it is important that the fibula is also securely fused to the tibia so that both bones lengthen evenly. If the fibula is not properly secured, this can lead to: displacement of the ankle joint, instability or pain in the knee, and degenerative changes.

That is why the technique used to fixate the fibula is crucial, and experienced surgeons strive to achieve a stable and symmetrical position for both bones.

8. Axial Deviation

During bone lengthening, slight deviations in the limb axis may occur, especially if the osteotomy was not performed at the optimal site or if the implant was not positioned correctly. Experienced surgeons use additional stabilizing devices, such as locking screws, to prevent deformities during bone growth.

Summary – Safety First

Limb lengthening, whether for medical or cosmetic purposes, is a procedure that requires extensive surgical experience, precise planning, and intensive rehabilitation. As the latest literature and the practice of specialized clinics show, it can be performed safely—and the risk of complications can be effectively minimized thanks to modern techniques, preventive measures, and close postoperative care.