The Accuracy of Ultrasound for Measurement of Mobile- Bearing Motion

Reducing radiation exposure in early-onset scoliosis surgery patients: novel use of ultrasonography to measure lengthening in magnetically-controlled growing rods

“…[22][23][24] Ultrasound is a non-invasive, non-ionizing imaging modality with increasing scope of applications, including the measurement of stents implanted in the human body, 25 the relationship of nerves to orthopedic implants 26 and the evaluation of mobile bearings in knee arthroplasty. 27 The use of ultrasound scanning had been reported in the measurement of leglength discrepancy, 28 assessment of new bone formation during limb lengthening, 29 and measurement of fetal spine length in utero. 30 As such, in an attempt to reduce the number of plain radiographs required to monitor and chart the distraction of the MCGRs, the following study was undertaken to determine the feasibility and reproducibility of the novel use of ultrasonography to measure rod distractions.…”

In Vivo Testing of Knee Stability After Rotating-hinge Total Knee Arthroplasty: A Comparison of 2 Knee Systems

“…This technique was used because it has been shown to be a reliable method with no additional radiation burden. 18 The ultra-sound head was positioned on the medial and lateral side of the knee until the echo of the hinged insert was detected ( Figure 3A). The ultrasound response of bone and metal was reported previously and differs from the distinct hyperechogenic signal of the hinged tibial insert.…”

“…The ultrasound response of bone and metal was reported previously and differs from the distinct hyperechogenic signal of the hinged tibial insert. 18 On freeze images, the medial and lateral distance between the femoral and tibial component were measured in flexion and extension ( Figure 3A). These measurements were repeated with varus and valgus stress to cause medial and lateral lift-off ( Figure 3).…”