Nakatsuchi Y, Tsuchikane A, Nomura A
Department of Orthopaedic Surgery, Shinshu University School of Medicine, Matsumoto, Japan.
J Orthop Trauma. 1996;10(1):50-62. doi: 10.1097/00005131-199601000-00008.
The resonant frequency of a long bone as measured using the impulse response method (IRM) can reflect the bending rigidity of the bone. A study was performed using IRM to quantitatively assess fracture healing in 67 tibial fractures. A temporary decrease in resonant frequency early in the treatment course was found in 55.6% of tibias, most frequently in the cases treated by external fixation (83.3%) and the AO plate (80%). The resonant frequency also decreased temporarily following the removal of the fixation devices in 76% of the tibias where they were removed. The resonant frequency of the fractured tibia at the final follow-up exceeded that of the contralateral side in 18% of tibias, approached within 20 Hz in 11.5%, and did not reach within 20 Hz in 70.5%. A questionnaire on the effectiveness of the IRM examination in the treatment of the tibia fractures was completed by the treating orthopaedic surgeons. The IRM examinations were found to be very useful in 58.2% of cases, useful in 31.3%, and useless in 10.4%. Thus, IRM examinations are most helpful when they are able to detect the change in bending rigidity early in the treatment of tibia fractures.
使用脉冲响应法（IRM）测量的长骨共振频率可反映骨骼的弯曲刚度。一项研究采用IRM对67例胫骨骨折的骨折愈合情况进行了定量评估。在治疗过程早期，55.6%的胫骨出现共振频率暂时下降，最常见于采用外固定（83.3%）和AO钢板（80%）治疗的病例。在76%的已拆除固定装置的胫骨中，拆除固定装置后共振频率也会暂时下降。在最终随访时，18%的胫骨骨折侧共振频率超过对侧，11.5%的胫骨骨折侧共振频率与对侧相差在20 Hz以内，70.5%的胫骨骨折侧共振频率与对侧相差未达20 Hz。治疗的骨科医生完成了一份关于IRM检查在胫骨骨折治疗中有效性的问卷。结果发现，58.2%的病例中IRM检查非常有用，31.3%的病例中IRM检查有用，10.4%的病例中IRM检查无用。因此，当IRM检查能够在胫骨骨折治疗早期检测到弯曲刚度的变化时，最有帮助。
