Reliability of Rod Lengthening, Thoracic, and Spino-Pelvic Measurements on Biplanar Stereoradiography in Patients Treated With Magnetically Controlled Growing Rods.

STUDY DESIGN: Cross-sectional study. OBJECTIVE: To assess the inter- and intraobserver reliability of thoracic, spino-pelvic, and rod lengthening measurements made on biplanar spinal stereoradiography (EOS imaging) in children treated with magnetically controlled growing rod (MCGR). SUMMARY OF BACKGROUND DATA: MCGR treatment aims to gain spine length while gradually correcting the spinal deformity. Monitoring thoracic and spino-pelvic parameters is crucial for successful management. EOS imaging is widely used for diagnosis and monitoring of children with Early Onset Scoliosis. However, there is a paucity of literature on the reliability of thoracic and spino-pelvic parameters on EOS imaging in children treated with MCGR. METHODS: Three independent reviewers independently read a random assortment of 20 whole spine posteroanterior and lateral radiographs from patients treated with MCGR. The measurements were repeated 4 weeks after the initial read. The following radiological parameters were measured: Cobb angle of the main and compensatory curves, coronal balance, coronal T1-S1 and T1-T12 length, chest width and depth at T6, pelvic inlet width, MCGR distracted lengths, global kyphosis, proximal and distal junctional angle, lordosis, sagittal balance, pelvic incidence, pelvic tilt and sacral slope. Statistical analysis was performed with paired t test and Cronbach alpha for inter- and intraobserver reliability. RESULTS: All measurements had good or excellent intra- and interobserver reliability (α>0.8; P < 0.05), except measurements of the proximal junctional angle which showed only poor intra- and interobserver reliability for patients with an upper instrumented vertebra cranial to T4. CONCLUSION: EOS imaging is reliable for diagnosis and monitoring of children with Early Onset Scoliosis treated with MCGR. EOS imaging is particularly excellent for assessment of MCGR lengthening. Diagnosis and interpretation of early proximal junctional kyphosis within the cervicothoracic junction should be made with caution. LEVEL OF EVIDENCE: 3.

Somatosensory evoked potentials can be recorded on the midline of the skull with subdermal electrodes in non-sedated rats elicited by magnetic stimulation of the tibial nerve.

Somatosensory evoked potentials (SSEPs) are a sensitive quantitative measure of conduction in somatosensory pathways of the central nervous system and are increasingly used in both clinical trials and animal experiments. SSEPs can be recorded in non-sedated rodents by magnetic stimulation (MS) of peripheral nerves. To overcome some disadvantages caused by using anesthesia and implanted recording electrodes, we used subdermal needle electrodes located on the midline of the skull to successfully record SSEPs in non-sedated rats, elicited by stimulating the tibial nerve with a magnetic stimulator. The wave form contains a typical P1 peak and N1 peak. Although there is a variation of P1 latency, N1 latency, and P1-N1 amplitude between right side and left side, it was not statistically significant. In addition, there is a significantly positive relationship between P1-N1 amplitude and MS strength, suggesting that the increase in magnetic stimulating strength resulted in the increase in P1-N1 amplitude. Results in the present study demonstrate that our modified method is a reliable and feasible paradigm for recording SSEPs in non-sedated rats.

Analisis poblacional del uso y eficiencia de los soportes plantares imantados / Population analysis use and efficiency orthotics magnetized

Todos los seres vivos se encuentran bajo la influencia de un campo magnético. Por esta afirmación han sido utilizados los dispositivos magnéticos en diversas patologías para aliviar la sintomatología. El objetivo del estudio es realizar una revisión de la literatura publicada acerca del tratamiento de diversas patologías mediante el uso de dispositivos imantados, principalmente el de los soportes plantares. Se diseña una encuesta (N=60) acerca del conocimiento poblacional sobre estos dispositivos. Los resultados obtenidos en las encuestas demuestran un escaso conocimiento de los dispositivos y poca creencia en los mismos. La revisión de la literatura pone de manifiesto que este tipo de tratamiento con imanes posee un gran componente placebo(AU)

All living beings are under the influence of a magnetic field. By this statement the magnetic devices in various pathologies have been used to relieve the symptoms. The objective of the study is to conduct a review of published literature on the treatment of various diseases using magnetic devices, mainly of magnetic insoles. Designing a survey (N = 60) of population knowledge on these devices. The results obtained in the surveys show a little knowledge of devices and little belief in them. The literature review shows that this type of treatment with magnets has a large placebo component(AU)