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Devices and Methods: External Fixation, Internal Nails, and Combined Approaches

A neutral comparison of limb lengthening fixation methods — external fixation, internal lengthening nails, and combined strategies (LON, LATN) — covering how they differ operationally and what factors surgeons consider when choosing a method. No ordering or recommendations are provided.

Stage: planningCategory: devicesUpdated 2026-07-15

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In brief

What should readers understand about Devices and Methods: External Fixation, Internal Nails, and Combined Approaches?

A neutral comparison of limb lengthening fixation methods — external fixation, internal lengthening nails, and combined strategies (LON, LATN) — covering how they differ operationally and what factors surgeons consider when choosing a method.

Limits: This page is educational context only and is not medical advice.

Evidence
Peer-reviewed evidence
Source set
Mixed source types
Updated
References
9 listed

Editorial responsibility: Limb Lengthening Library editorial team. Independent medical review is not claimed unless a named reviewer is listed. How sources are reviewed.

The Main Fixation Strategies

All methods use , but they stabilize and move the bone differently. The practical comparison is not simply internal versus external: it includes device-specific load limits, pin-site exposure, number and timing of operations, implant fit, deformity-correction needs, follow-up, and regulatory status. [1]

Device and method overview with a dated reminder to verify current labeling, availability, and recall status.

External Fixation

Circular, monolateral, and hexapod frames connect to bone through pins or wires. They can provide powerful multiplanar correction and do not require a large , but they create pin sites, visible external hardware, and frame-specific mobility and care demands. Pin-site problems are common; deep infection, alignment, , and problems remain possible.

Motorized Intramedullary Nails

Internal nails place a telescoping implant inside the bone and use a device-specific actuation system. They avoid external pin sites, but they still require , locking screws, serial imaging, load restrictions, and usually a later removal operation. Nail diameter, length, curvature, stroke, entry approach, and magnetic-controller depth all need to match the patient and current instructions for use. [1][2]

Combined Methods: LON and LATN

Lengthening Over a Nail (LON)

In LON, an and are present during distraction. The frame is removed and the nail is locked to support . In a randomized 31-limb study, LON shortened external-fixator time and had fewer overall reported complications than conventional Ilizarov lengthening, but 3 of 15 LON limbs developed deep infection. Both findings belong in the consent discussion. [3]

Lengthening And Then Nailing (LATN)

LATN uses an for distraction and inserts an at a later operation for . The approach reduces frame duration compared with classic in the original case-matched study, but adds a second major procedure. External and are not intended to remain together through distraction, although conversion and infection precautions still require careful technique. [4]

Weight-Bearing Is Model- and Diameter-Specific

Do not apply one kilogram limit to every nail. Permitted load depends on the exact product, diameter, bone, number of implanted devices, treatment phase, and current instructions. The treating surgeon may impose a stricter limit. A cleared or marketed design claim is not permission to exceed the written protocol. [2]

Current U.S. Regulatory Snapshot

The FDA states that stainless-steel devices, including , remain recalled and should not be implanted. The titanium IMLL instructions include removal after one year. received 510(k) clearance in 2023. A separate Class II recall covers identified 2024 catalog and lot combinations; the open FDA record, updated July 14, 2026, tells customers to stop using and return affected unimplanted devices. It does not establish that every later or current unit is recalled or available. [2][5][6]

Availability Is Not Global or Static

Official U.S. records include clearances for TAA and the Transport and Lengthening System, but clearance does not prove local stocking, an indication for a particular patient, or the status of every catalog item. An open 2025 Class II recall identifies two units from specified trochanteric nail lots; it is not a product-family recall. Verify the exact model, UDI or lot, current instructions, and local regulator record for every proposed implant. [7][8][9]

Questions That Make a Device Comparison Useful

  • What is the exact manufacturer, model, diameter, stroke, and lot or catalog family?
  • What load is permitted in each phase, and is that per limb or total body loading?
  • What operations are planned for locking, frame removal, conversion, or ?
  • What is the current regulatory and recall status in the country where surgery occurs?
  • What are this center's own device, infection, alignment, and reoperation outcomes?

Sources

Verification policy

Informational only. Not medical advice.