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Accessory Structures of the Skin: Nails

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Related Experiment Video

Updated: Nov 13, 2025

An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice

An Intramedullary Locking Nail for Standardized Fixation of Femur Osteotomies to Analyze Normal and Defective Bone Healing in Mice

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Post-retrieval functionality testing of PRECICE lengthening nails: The "Sleeper" nail concept.

Hady H Eltayeby^1,2, Hamza M Alrabai^1,3, Julio J Jauregui⁴

¹International Center for Limb Lengthening, Rubin Institute for Advanced Orthopedics, Sinai Hospital of Baltimore, Baltimore, MD, USA.

Journal of Clinical Orthopaedics and Trauma

|March 15, 2021

Summary

This summary is machine-generated.

Dormant PRECICE nails can be reactivated for further limb lengthening, with 84.3% success. Avoid full deployment to prevent mechanism damage, ensuring successful re-lengthening with the PRECICE nail.

Keywords:

Expandable rod Internal limb lengthening PRECICE® nail Sleeper nail

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Last Updated: Nov 13, 2025

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Published on: February 28, 2025

Area of Science:

Orthopedic surgery
Biomedical engineering

Background:

PRECICE intramedullary magnetic lengthening nails are used for long bone lengthening.
The "sleeper" nail concept proposes dormant implants for staged lengthening, potentially reducing joint and soft tissue stress.
The functionality of dormant PRECICE nails after extended periods was investigated.

Purpose of the Study:

To evaluate the mechanical functionality of explanted PRECICE nails after a dormant period.
To determine the viability of the "sleeper" nail concept for staged limb lengthening.

Main Methods:

102 consecutively explanted PRECICE nails were tested for lengthening and retraction functionality.
A "fast magnet" was used to test the nail mechanism, avoiding full stroke capacity to prevent jamming.
Nail functionality was assessed based on successful lengthening and retraction to specified parameters.

Main Results:

84.3% (86/102) of the tested PRECICE nails performed successfully.
No statistical significance was found between successful/failed nails based on nail type, generation, diameter, length, or in vivo interval.
Nails that were fully deployed at the time of testing were significantly more likely to fail (p < 0.001).

Conclusions:

Dormant PRECICE nails can be successfully reactivated for further lengthening.
Full deployment of the PRECICE nail may compromise its mechanism for future re-lengthening.
Candidate nails for the "sleeper" concept should be free of visible damage and not fully deployed.