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Ilizarov wire tensioning and holding methods: a biomechanical study
A W Davidson1, M Mullins, David Goodier
1The Orthopaedic and Trauma Department, The Royal London Hospital, Whitechapel, London E1 1BB, UK. alastair_davidson@hotmail.com
Injury
|February 5, 2003
Summary
Ilizarov wire tensioning methods were compared. Twisting Russian bolts achieved higher tensions more easily than mechanical tensioners, making them recommended for effective Ilizarov external fixation.
Area of Science:
- Orthopedic biomechanics
- Surgical device engineering
Background:
- Ilizarov external fixation is crucial for bone fracture treatment.
- Precise wire tensioning is vital for construct stability and healing outcomes.
- Current methods for Ilizarov wire tensioning require evaluation for efficiency and effectiveness.
Purpose of the Study:
- To compare the effectiveness of two Ilizarov wire tensioning methods.
- To assess mechanical tensioners versus manual bolt-twisting techniques.
- To identify optimal wire holding bolts for achieving desired tension.
Main Methods:
- Utilized a Hounsfield test machine (H25KS) for stress/strain analysis.
- Assessed the department's existing mechanical tensioners.
- Evaluated three types of Ilizarov wire holding bolts: cannulated, slotted, and Russian, using manual twisting.
Main Results:
- Mechanical tensioners were accurate but inefficient, with a maximum tension of 1330N.
- Russian bolts proved most effective, generating mean tensions from 785N to 1695N depending on twist angle.
- Cannulated and slotted bolts frequently caused wire breakage at 90-degree twists.
Conclusions:
- Manual twisting of wire holding bolts is more efficient than mechanical tensioners.
- Russian bolts provide superior and easily achievable wire tensioning.
- Russian bolts are recommended for Ilizarov wire tensioning via bolt twisting.