Methods of Limb Lengthening Surgery Explained: Internal Nails vs External Fixators

Modern limb lengthening surgery is performed using two primary methods: internal motorized nails and external fixators.

Internal Motorized Nails

Modern

A telescopic nail is placed inside the bone. The nail lengthens gradually using a magnetic or motorized mechanism.

Advantages

• Smaller external scars

• Lower pin-site infection risk

• Better comfort during daily activities

• Easier clothing and hygiene management

Disadvantages

• Higher cost

• Not suitable for every bone size

• May have weight-bearing limitations depending on the implant

External Fixators

Traditional

A frame is attached outside the leg and connected to the bone through pins or wires.

Advantages

• Can achieve significant lengthening

• Useful for complex deformities

• Often less expensive than internal systems

Disadvantages

• Pin-site care is required

• More visible hardware

• Higher risk of superficial infections

• Can be less comfortable during rehabilitation

Which method is better?

The role of rehabilitation

Regardless of the method, physical therapy is essential. The device itself creates the lengthening, but rehabilitation helps maintain joint movement, muscle flexibility, and walking ability.