Poudrel Anne-Sophie, Rosi Giuseppe, Nguyen Vu-Hieu, Haiat Guillaume
MSME, CNRS, UMR 8208, Univ Paris Est Creteil, Univ Gustave Eiffel, 61, Avenue du Général de Gaulle, 94010, Créteil Cedex, France.
MSME, Univ Paris Est Creteil, UMR CNRS 8208, CNRS, Univ Gustave Eiffel, 94010, Creteil, France.
Ann Biomed Eng. 2022 Jan;50(1):16-28. doi: 10.1007/s10439-021-02887-9. Epub 2022 Jan 7.
The femoral stem primary stability achieved by the impaction of an ancillary during its insertion is an important factor of success in cementless surgery. However, surgeons still rely on their proprioception, making the process highly subjective. The use of Experimental Modal Analysis (EMA) without sensor nor probe fixation on the implant or on the bone is a promising non destructive approach to determine the femoral stem stability. The aim of this study is to investigate whether EMA performed directly on the ancillary could be used to monitor the femoral stem insertion into the bone. To do so, a cementless femoral stem was inserted into 10 bone phantoms of human femurs and EMA was carried out on the ancillary using a dedicated impact hammer for each insertion step. Two bending modes could be identified in the frequency range [400-8000] Hz for which the resonance frequency was shown to be sensitive to the insertion step and to the bone-implant interface properties. A significant correlation was obtained between the two modal frequencies and the implant insertion depth (R = 0.95 ± 0.04 and R = 0.94 ± 0.06). This study opens new paths towards the development of noninvasive vibration based evaluation methods to monitor cementless implant insertion.
在非骨水泥型手术中，辅助器械插入时通过敲击实现的股骨柄初始稳定性是手术成功的一个重要因素。然而，外科医生仍依赖自身的本体感觉，这使得该过程具有高度主观性。在不将传感器或探头固定在植入物或骨头上的情况下使用实验模态分析（EMA）是一种很有前景的非破坏性方法，可用于确定股骨柄的稳定性。本研究的目的是调查直接在辅助器械上进行的EMA是否可用于监测股骨柄插入骨内的过程。为此，将一个非骨水泥型股骨柄插入10个模拟人股骨的骨模型中，并在每次插入步骤时使用专用冲击锤对辅助器械进行EMA。在[400 - 8000]Hz频率范围内可识别出两种弯曲模式，其共振频率对插入步骤和骨 - 植入物界面特性敏感。两种模态频率与植入物插入深度之间存在显著相关性（R = 0.95 ± 0.04和R = 0.94 ± 0.06）。本研究为开发基于振动的无创评估方法以监测非骨水泥型植入物插入开辟了新途径。
