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Updated: Jun 8, 2026

Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models
Published on: October 9, 2014
Hoffman II external fixator techniques--a work-around to use small pins in large clamps
M P Rodger1, D Standley, M Kazel
1MDHU Derriford, Plymouth, Devon. mike.rodger@doctors.org.uk
Abstract:
We describe a novel technique to allow use of small pins in medium pin size clamps. Slipping a second 3 mm pin into the same clamp hole as the first allows the 5 mm clamp to bite securely on a 3 mm pin. This enables construction of an external fixator frame utilising 3 mm and 5 mm pins, as required to span the elbow, wrist and ankle. This extends the capabilities of the 5 mm clamp and reduces the need for extra materiel such as sets containing damps to connect 3 mm pins to standard size rods.
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