Benirschke S K, Mirels H, Jones D, Tencer A F
Department of Orthopaedics, University of Washington, Seattle.
J Orthop Trauma. 1993;7(1):64-71. doi: 10.1097/00005131-199302000-00012.
A study was performed to assess the usefulness of measuring the resonant frequency of vibration of the tibia as a determinant of its flexural rigidity in fracture healing. The measurement system consisted of an electronic tapper that struck the anteromedial distal surface of the tibia and an accelerometer, held against the proximal surface, that received the response. Custom software displayed the frequency spectrum from which the first mode bending frequency of the tibia could be pinpointed. We have found that resonant frequency was highly correlated to the log of tibial flexural rigidity, with an exponent of 0.582 (r2 = 0.815). In human volunteers, a series of four tests at monthly intervals showed a reproducibility of approximately 3% (95% confidence interval) with no significant variability between right and left legs. In 14 patients with healing tibial fractures, resonant frequency ratio (healing/injured leg) was correlated to time ratio (time of test/time healed) by a second-order polynomial fit (r2 = 0.58).
进行了一项研究，以评估测量胫骨振动共振频率作为骨折愈合中其抗弯刚度决定因素的有用性。测量系统由一个敲击胫骨远端前内侧表面的电子敲击器和一个贴靠在近端表面接收响应的加速度计组成。定制软件显示频谱，通过该频谱可以确定胫骨的第一模态弯曲频率。我们发现共振频率与胫骨抗弯刚度的对数高度相关，指数为0.582（r2 = 0.815）。在人类志愿者中，每月进行一次的一系列四项测试显示重复性约为3%（95%置信区间），左右腿之间无显著差异。在14例胫骨骨折愈合患者中，共振频率比（愈合腿/受伤腿）与时间比（测试时间/愈合时间）通过二阶多项式拟合相关（r2 = 0.58）。
