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Resonant frequency of a pin-accelerometer system mounted in bone
Journal of Biomechanics
|May 1, 1995
Summary
Plucking intraosseous pins is a reliable method for determining resonant frequency. For accurate spinal motion measurement up to 32 Hz, use pins with a 2.0 mm diameter or greater.
Area of Science:
- Biomedical Engineering
- Orthopedics
- Biomechanics
Background:
- Intraosseous metal pins are frequently used for invasive spinal motion measurement.
- Accurate measurement of spinal motion requires understanding the dynamic properties of these pins.
Purpose of the Study:
- To determine the resonant frequency of intraosseous pins with attached accelerometers.
- To establish optimal pin dimensions for accurate bone movement measurement.
Main Methods:
- Two distinct methods were employed to determine the resonant frequency of intraosseous pins.
- A plucking method was utilized to excite and measure pin vibrations.
Main Results:
- The plucking method proved reliable for determining the resonant frequency of intraosseous pins.
- Accurate measurement of bone movement up to 32 Hz necessitates a pin diameter of at least 2.0 mm.
- Optimal pin dimensions include a total length not exceeding 80 mm, a bone-accelerometer distance of 25 mm, and a pin diameter of 2.4 mm for a 27 g accelerometer mass.
Conclusions:
- Plucking is a validated technique for assessing intraosseous pin resonant frequencies.
- Specific pin dimensions are critical for achieving accurate spinal motion data in the 32 Hz range.