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Published on: October 15, 2019
Quantitative fit assessment of tibial nail designs using 3D computer modelling
B Schmutz1, K Rathnayaka, M E Wullschleger
1Institute of Health and Biomedical Innovation, Queensland University of Technology, 60 Musk Avenue, Kelvin Grove, Brisbane, QLD 4059, Australia. b.schmutz@qut.edu.au
Injury
|November 3, 2009
Summary
A new 3D modeling method quantitatively assessed tibial nail fit in Asian tibiae. The ETN-Proximal-Bend nail showed significantly better anatomical fit, reducing cortical protrusion compared to the standard ETN nail.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Anatomical modeling
Background:
- Intramedullary nailing is standard for adult tibial diaphyseal fractures.
- Modern tibial nail bends improve insertion, stability, and alignment.
- Current nail designs may not optimally fit Asian tibiae.
Purpose of the Study:
- To develop a quantitative method for assessing tibial nail anatomical fit.
- To evaluate the fit of two tibial nail designs in Asian tibiae using 3D computer modeling.
Main Methods:
- Utilized 3D computer models of two tibial nail designs (ETN and ETN-Proximal-Bend).
- Employed 20 CT-based 3D cortex models of Japanese cadaver tibiae.
- Assessed anatomical fit by quantifying nail protrusion into the cortical bone.
Main Results:
- The ETN-Proximal-Bend showed significantly less total surface area protrusion (540 mm²) compared to ETN (1044 mm²).
- Maximum nail protrusion distance was significantly smaller for ETN-Proximal-Bend (1.2 mm) versus ETN (2.7 mm).
- Both differences were statistically significant (p<0.05).
Conclusions:
- A quantitative 3D computer modeling method effectively assessed tibial nail fit.
- The ETN-Proximal-Bend demonstrated superior intramedullary fit with reduced cortical protrusion in Asian tibiae.
- This method can aid implant design and pre-operative planning for patient-specific nail selection.