Estudo comparativo da velocidade e atenuação ultra-sônica na avaliação da consolidação óssea

Abstract

Objectives: The objective of this study was to compare the in vitro ultrasonic velocity and attenuation in bone healing evaluation. Methods: Seventeen sheep weighting 37 kg in average were used, being divided into two groups of five animals each and one group of seven animals, according to the postoperative follow-up time (30, 60 and 90 days, respectively). Osteotomies were performed on the right tibiae and the intact left tibiae of the 17 animals were used as control. The healing process was monitored with conventional conventional radiographs taken at two-week intervals. The animals were sacrificed at the end of the corresponding follow-up period and both right and left tibiae were removed for in vitro underwater and contact ultrasound evaluations. The transverse and longitudinal ultrasound propagation velocity (USPV) and the broadband ultrasound attenuation (BUA) were measured and correlated. Results: USPV increased with the progression of the healing process, while BUA decreased, with significant differences between the experimental and control groups and between the experimental groups, for most of the comparisons. Conclusion: It was concluded that the method using ultrasound as employed in this investigation is feasible and reliable for evaluating cortical bone healing.

Recycled windshield glass as new material for producing ultrasonic phantoms of cortical bone-healing stages

“…The bulk density data (table 2) agree with studies of fractures in which there is an increase in bone density together with the values of c L as the healing progresses, as opposed to the rise that occurs with attenuation, which tends to be reduced with the advancement of bone healing owing to the loss of continuity that occurs when there is a fracture (Saulgozis et al 1996, Barbieri et al 2009.…”

“…Comparison between the ultrasonic longitudinal velocity of the present study and those found in the works ofProtopappas et al 2006, Barbieri et al 2009, and Vavva et al 2008 …”

“…When the correlation between the corrected attenuation coefficient and c L was verified, the results indicated a high (625 °C, 645 °C, and 663 °C) and moderate (for 657 °C) negative correlation between these parameters, as studies show the same trend of the velocity increase and attenuation reduction as the fracture healing progresses, which explains the negative correlation between these parameters (Vavva et al 2008, Barbieri et al 2009. Saulgozis et al 1996, in studying human cortical tibia in vivo and in situ, observed this tendency, explaining that the increase in attenuation until a few weeks after a fracture is due to the tremendous acoustic impedance suffered by the ultrasound wave at the bone-callus and callus-bone interfaces.…”

“…3.5. Correlation between acoustic parameters c L and a c Although they are independent, the correlation between the acoustic values c L and the attenuation coefficients were verified because these parameters are often applied in studies using QUS (Barbieri et al 2009, Hoffmeister et al 2018. After the non-normal distribution of each of the acoustic parameters was verified considering all study data via the K-S test (p<0.05, data=1, 200 per parameter), Spearman's correlation coefficients showed high results (ρ=−0.84, p<0.01) between c L and a .…”