Determination of The Hip Stem Loosening Using Vibration Method

Year 2019, Volume: 3 Issue: 1, 73 - 77, 27.06.2019

Talip Çelik , Yasin Kisioglu

Abstract

Aseptic
loosening is a common problem in total hip replacement surgery. Routine
radiological imaging techniques are used for postoperative diagnosis. The
alternative technique is required to develop because of the low success rate in
current diagnostic techniques. The purpose of this study is to develop the new
method to diagnose the aseptic loosening of the stem using vibration technique.
Two different experimental setups were established in this study, vibrational
and cyclic loading tests. In the vibrational test, the bone-prosthetic models
were vibrated from the distal femur at a certain frequency and then the
vibration data were taken via accelerometer from the trochanter region of the
femur. The vibration data were converted to the frequency domain for
evaluations. The stability of the femur-prosthesis system was determined by
evaluating the fundamental frequency change and harmonics generated at the FFT
analysis. In the cyclic loading test, the femur-prosthesis system was forced to
fatigue at a maximum amplitude of 1700 N and 1 Hz frequency. After every 5000
cycles in the test, the femoral prosthesis system was connected to the
vibrational test and the loosening of the system was considered. After 115000 cycles,
the harmonic frequencies were observed and the amplitude value of the
fundamental frequency was decreased. The experiments were stopped when the stem
was pulled out easily from the femur. As the degree of the loosening increased,
the number of the harmonics increased and the fundamental frequency values
decreased. In conclusion, the vibration method can be used as an alternative
technique to determine the degree of the hip stem loosening.

Keywords

Aseptic loosening, Total Hip Prosthesis, Vibration Technique, Cyclic Loading

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