Abstract | Keywords | Export | Availability | Bookmark

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Total Hip Arthroplasty is a common surgery for replacing impaired hip joints. One of the important steps in the procedure is to hammer the acetabular cup so that it is fixed in the pelvis. However, the depth of hammering is decided by the surgeon based on his or her experience. The fixation is crucial for evaluating the surgery: the pelvis might be fractured in case of too much hammering, this causes secondary injuring to the patient; if the fixation is insufficient, the acetabular cup could not be fixed properly. The research of the thesis is in the framework of finding this appropriate endpoint of insertion based on acoustic technology and will contain the evaluation of this new technique on foam block and animal bone models. By exciting the system, the generated sounds will be recorded. By using Fast Fourier Transform (FFT), the sound signals in time domain are transferred to the frequency domain. The resonance frequencies can be extracted. By observing the shift tendency of resonance frequencies. The end point of insertion will be determined. The experiments are conducted on six foam blocks and two bovine blocks. For the foam blocks, there are in total two sensitive resonance frequencies, the second one which varies from 1400 Hz to 2400 Hz turns out to be the most sensitive and the clearest, it can be used as the criterion to stop the insertion. For bovine blocks, the experiments are conducted on both one dried block without marrow and one moisturized block with marrow, the result on the moisturized block with marrow is more clear than the result on dried one without marrow. This is a decent result since moisturized bovine block with marrow is closer to intraoperative situation. Both results on foam and bovine blocks indicate that the feature of resonance frequencies can be used as a criterion to stop the insertion, if resonance frequency stops shifting around certain frequency for two or three times, this indicates the end of the insertion has been reached. However, the experiments have not been performed on in vivo situation, this could be done in the future work.