Christensen A B, Ammitzbøll F, Dyrbye C, Cornelissen M, Cornelissen P, Van der Perre G
J Biomech. 1986;19(1):53-60. doi: 10.1016/0021-9290(86)90108-9.
Vibrational methods to monitor fracture healing, the BRA and the IFR, are compared under different supporting conditions, excitation technique and signal processing. Mode shapes are identified by modal analysis. A wet excised human tibia and an amputation specimen are investigated. Excitation technique and signal processing caused only minor differences in the resonance frequencies. The supporting conditions had an important influence on the single bending modes changing both mode-shapes and frequencies. Thus the BRA-splint imposed a node at the malleolus. Modal analysis revealed the following modes in the two supporting conditions: BRA-splint: A 'rigid body' mode of 165 Hz in the sagittal plane. A single bending mode of 315 Hz close to the sagittal plane. IFR-hanging leg: A 'rigid-body' mode of 167 Hz close to the sagittal plane. Two single bending modes ('free-free'), a mode of 303 Hz close to the frontal plane and a mode of 470 Hz in the sagittal plane.
在不同的支撑条件、激励技术和信号处理方式下，对用于监测骨折愈合的振动方法——BRA和IFR进行了比较。通过模态分析识别振型。研究了一个湿的切除的人体胫骨和一个截肢标本。激励技术和信号处理在共振频率上仅引起微小差异。支撑条件对单个弯曲模态有重要影响，改变了振型和频率。因此，BRA夹板在踝关节处形成一个节点。模态分析揭示了在两种支撑条件下的以下模态：BRA夹板：矢状面内165Hz的“刚体”模态。接近矢状面的315Hz的单个弯曲模态。IFR悬垂腿：接近矢状面的167Hz的“刚体”模态。两个单个弯曲模态（“自由-自由”），接近额状面的303Hz的模态和矢状面内470Hz的模态。
