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External fixation of the leg using unilateral biplanar frames
Archives of Orthopaedic and Traumatic Surgery. Archiv Fur Orthopadische Und Unfall-Chirurgie
|January 1, 1985
Summary
This study presents a new method for testing external fixator stability. A unilateral biplanar frame offers rigidity comparable to bilateral frames, potentially avoiding pin placement in sensitive leg compartments.
Area of Science:
- Orthopedic biomechanics
- Surgical device engineering
Background:
- External fixators are crucial for fracture management.
- Assessing the stability of different external fixator configurations is vital for clinical application.
- Understanding frame rigidity under various stress planes is important for optimal device selection.
Purpose of the Study:
- To introduce a simple and reliable method for evaluating external fixator stability.
- To compare the rigidity of different external fixator designs under simulated clinical stresses.
- To investigate the influence of bending stresses in multiple planes on frame stability.
Main Methods:
- Testing of unilateral uniplanar, unilateral biplanar, and bilateral uniplanar external fixator frames.
- Measurement of frame deformations under bending stresses applied in different planes.
- Simulation of stresses encountered during clinical practice.
Main Results:
- External fixator frames exhibit variable rigidity across different bending planes.
- A unilateral biplanar frame, even without transfixation pins, demonstrates rigidity equivalent to a bilateral frame.
- This configuration allows for application on the leg while avoiding pin insertion through the anterolateral compartment.
Conclusions:
- The developed method provides a reliable assessment of external fixator stability.
- Unilateral biplanar frames offer a viable alternative to bilateral frames in terms of rigidity.
- Clinical application of unilateral biplanar frames may enhance patient safety by avoiding critical anatomical structures.