Evaluation of Several Limb Lengthening Methods

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Posts: 356

Joined: Jun 2026

Posted on Jun 18, 2026, 8:32 pm

#1

Limb lengthening surgery has become increasingly popular in recent years, offering individuals the opportunity to increase their height or correct leg length discrepancies. Among the various techniques developed, each method comes with its own advantages, limitations, and associated risks. Understanding these differences is crucial for anyone considering the procedure. This article provides an overview and evaluation of several common Limb lengthening methods.

Part 1
LON Leg Lengthening Method: Pros, Cons, and Risks

The LON (Lengthening Over Nail) method combines an internal intramedullary nail with an external fixator to achieve leg lengthening. Below is an overview of its advantages, disadvantages, and potential risks:

Advantages

Low cost compared to fully internal methods.
Capable of large lengthening distances, making it appealing for those seeking major height increases.
Strong structural support: The solid internal nail can bear weight effectively after removing the external fixator.

Disadvantages

Low bone axis accuracy: Increases the chance of misalignment, such as bowed legs or uneven leg lengths.
Damage to soft tissue: Screws connecting the external fixator to the bone may injure muscles and tendons, especially during prolonged lengthening.
Difficulty in daily activities: The presence of an external frame makes movement and living routines more difficult.
Open wounds: Pin sites from the external fixator can slow down bone healing.
Practical length limitation: Average effective lengthening is about 5 cm; going beyond becomes much harder and riskier.

Risks

High risk of infection due to prolonged exposure from open pin wounds.
Permanent tendon damage caused by the external fixation system.
Bone axis deformities can occur, affecting the leg’s structure and symmetry.
Unequal leg lengths as a result of inaccurate control during the lengthening process.

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Limb lengthening surgery has become increasingly popular in recent years, offering individuals the opportunity to increase their height or correct leg length discrepancies. Among the various techniques developed, each method comes with its own advantages, limitations, and associated risks. Understanding these differences is crucial for anyone considering the procedure. This article provides an overview and evaluation of several common Limb lengthening methods.

Part 1
LON Leg Lengthening Method: Pros, Cons, and Risks

The LON (Lengthening Over Nail) method combines an internal intramedullary nail with an external fixator to achieve leg lengthening. Below is an overview of its advantages, disadvantages, and potential risks:

Advantages

Low cost compared to fully internal methods.
Capable of large lengthening distances, making it appealing for those seeking major height increases.
Strong structural support: The solid internal nail can bear weight effectively after removing the external fixator.

Disadvantages

Low bone axis accuracy: Increases the chance of misalignment, such as bowed legs or uneven leg lengths.
Damage to soft tissue: Screws connecting the external fixator to the bone may injure muscles and tendons, especially during prolonged lengthening.
Difficulty in daily activities: The presence of an external frame makes movement and living routines more difficult.
Open wounds: Pin sites from the external fixator can slow down bone healing.
Practical length limitation: Average effective lengthening is about 5 cm; going beyond becomes much harder and riskier.

Risks

High risk of infection due to prolonged exposure from open pin wounds.
Permanent tendon damage caused by the external fixation system.
Bone axis deformities can occur, affecting the leg’s structure and symmetry.
Unequal leg lengths as a result of inaccurate control during the lengthening process.

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mariodevn

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Posts: 81

Joined: Jun 2026

Posted on Jun 18, 2026, 8:32 pm

#2

This is an example of a LON bone deformity complication – where the two legs are no longer equal after leg lengthening. The left leg (L) shows misalignment in both the upper and lower femur, causing the thigh bone to bend inward after the lengthening procedure. The lower leg (tibia) is also slightly misaligned, resulting in the overall left leg curving inward significantly. This condition can negatively affect walking and may lead to long-term spinal issues.

You may be able to partially correct this by asking the surgeon to use additional screws to adjust the alignment of the nail during the frame removal surgery. If not addressed at this stage, you might need to undergo axis correction after full recovery.

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mariodevn

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Posts: 344

Joined: Jun 2026

Posted on Jun 18, 2026, 8:32 pm

#3

The image on the L side is an example of a LON side view bone axis deformity. The tibia is bent backward, and this type of deformity also affects walking and the spine. However, in the long term, it may lead to bone fractures if you engage in intense physical activity.

You can also see in the image on the R side that the screw hole is larger and longer than the screw itself. This makes it easier for the doctor to insert the screw into the hole, but it can also result in bone shortening after the external fixator is removed. In particular, it may cause a leg length discrepancy.

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