Interactions between programmable shunt valves and magnetically controlled growing rods for scoliosis

2020 ◽  
Vol 26 (6) ◽  
pp. 667-670
Author(s):  
Thomas Larrew ◽  
Mohammed Alshareef ◽  
Robert F. Murphy ◽  
Ramin Eskandari ◽  
Libby Kosnik Infinger
Keyword(s):  
Remote Control ◽  
Ex Vivo ◽  
Shunt Valve ◽  
Growing Rods ◽  
Growing Rod ◽  
Before And After ◽  
Magnetically Controlled Growing Rods ◽  
Ex Vivo Study

OBJECTIVEAlthough the advent of magnetic growing rod technology for scoliosis has provided a means to bypass multiple hardware lengthening operations, it is important to be aware that many of these same patients have a codiagnosis of hydrocephalus with magnet-sensitive programmable ventricular shunts. As the magnetic distraction of scoliosis rods has not previously been described to affect the shunt valve setting, the authors conducted an investigation to characterize the interaction between the two devices.METHODSIn this ex vivo study, the authors carried out 360 encounters between four different shunt valve types at varying distances from the magnetic external remote control (ERC) used to distract the growing rods. Valve settings were examined before and after every interaction with the remote control to determine if there was a change in the setting.RESULTSThe Medtronic Strata and Codman Hakim valves were found to have setting changes at distances of 3 and 6 inches but not at 12 inches. The Aesculap proGAV and Codman Certas valves, typically described as MRI-resistant, did not have any setting changes due to the magnetic ERC regardless of distance.CONCLUSIONSAlthough it is not necessary to check a shunt valve after every magnetic distraction of scoliosis growing rods, if there is concern that the magnetic ERC may have been within 12 inches (30 cm) of a programmable ventricular shunt valve, the valve should be checked at the bedside with a programmer or with a skull radiograph along with postdistraction scoliosis radiographs.

Evaluation of an overlapping pubic and ischiatic osteotomy for the improvement of acetabular ventroversion in dogs: an ex vivo study

2016 ◽  
Vol 29 (06) ◽  
pp. 499-506
Author(s):  
James Roush ◽  
David Biller ◽  
Julie Gervais
Keyword(s):  
Ex Vivo ◽  
Single Session ◽  
Surgical Equipment ◽  
Minimal Impact ◽  
Computed Tomography Images ◽  
Pelvic Inlet ◽  
Before And After ◽  
Patients At Risk ◽  
Canine Hip Dysplasia ◽  
Ex Vivo Study

SummaryObjectives: To assess the potential of a new single-session surgical procedure, the overlapping pubic and ischiatic osteotomy (OPIO) for modification of bilateral hip conformation. We hypothesized that OPIO would be simple to perform with currently available surgical equipment, through a single surgical approach, with minimal potential morbidity, and that it would allow adequate simultaneous bilateral improvement of coxofemoral joint conformation in patients at risk of canine hip dysplasia.Methods: The OPIO procedure was performed in the pelves of five large breed canine cadavers. Computed tomography images of each cadaver were compared by measurement of the dorsal acetabular rim angle (DARA), acetabular angle (AA), dorso-ventral sacroiliac ratio (SR), and pubic inlet area before and after OPIO.Results: Coxofemoral joint conformation was improved after OPIO. Postoperative DARA was significantly decreased (mean: –5.09°) and AA was significantly increased (mean: 3.54°) after OPIO. The SR was not significantly different after OPIO, indicating minimal impact on the sacro-illiac joints by the procedure. Pubic inlet dimensions and area were significantly decreased after OPIO, but the overall effect on pelvic inlet area was clinically insignificant.Clinical significance: An OPIO allows some improvement of coxofemoral joint conformation in canine cadavers.

scholarly journals Computed Tomographic Tenography of Normal Equine Digital Flexor Tendon Sheath: An Ex Vivo Study

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Luca Lacitignola ◽  
Pasquale De Luca ◽  
Alessandro Guarracino ◽  
Antonio Crovace
Keyword(s):  
Flexor Tendon ◽  
Ex Vivo ◽  
Tendon Sheath ◽  
Computed Tomographic ◽  
Contrast Enhanced ◽  
Superficial Digital Flexor Tendon ◽  
Before And After ◽  
Flexor Tendon Sheath ◽  
The Common ◽  
Ex Vivo Study

Aim of this study was to document the normal computed tomographic tenography findings of digital flexor tendon sheath. Six ex vivo normal equine forelimbs were used. An axial approach was used to inject 185 mg/mL of iopamidol in a total volume of 60 mL into the digital flexor tendon sheaths. Single-slice helical scans, with 5 mm thickness, spaced every 3 mm, for a pitch of 0.6, and with bone algorithm reconstruction, were performed before and after injections of contrast medium. To obtain better image quality for multiplanar reconstruction and 3D reformatting, postprocessing retroreconstruction was performed to reduce the images to submillimetre thickness. Computed tomographic tenography of digital flexor tendon sheaths could visualize the following main tendon structures for every forelimb in contrast-enhanced images as low densities surrounded by high densities: superficial digital flexor tendon, deep digital flexor tendon, manica flexoria, mesotendons, and synovial recess. Results of this study suggest that computed tomographic tenography can be used with accuracy and sensitivity to evaluate the common disorders of the equine digital flexor tendon sheath and the intrathecal structures.

Feasibility of Cone-beam Computed Tomography in Detecting Lateral Canals before and after Root Canal Treatment: An Ex Vivo Study

2017 ◽  
Vol 43 (6) ◽  
pp. 1014-1017 ◽  
Author(s):  
Thiago Oliveira Sousa ◽  
Bassam Hassan ◽  
Hesam Mirmohammadi ◽  
Hagay Shemesh ◽  
Francisco Haiter-Neto
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Root Canal ◽  
Ex Vivo ◽  
Root Canal Treatment ◽  
Cone Beam ◽  
Before And After ◽  
Ex Vivo Study

scholarly journals DOES PRESTERILIZATION HAS ANY INFLUENCE ON CONSERVATIVE AND ENDODONTIC MATERIAL STERILITY, IMMEDIATELY AFTER UNPACKING AND POST EXPOSURE TO CLINICAL ENVIRONMENT FOR 15 DAYS - AN EX VIVO STUDY.

2020 ◽  
Vol 9 (3) ◽  
Author(s):  
S. Anitha Rao ◽  
Deepthi Angalakuditi ◽  
Sunehra Sanam ◽  
K Santhosh Reddy ◽  
Sabavat Sangeetha
Keyword(s):  
Ex Vivo ◽  
Matched Pairs ◽  
Cross Contamination ◽  
Clinical Environment ◽  
Time Points ◽  
Post Exposure ◽  
Gutta Percha ◽  
Before And After ◽  
Ex Vivo Study ◽  
Dental Burs

Background: Instruments used in the operative area are colonised by various microbial organisms during usage. Sterilization is an important prerequisite to avoid cross contamination. Purpose of the study: The purpose of this study was to evaluate whether presterilization has any influence on conservative and endodontic material sterility, immediately after unpacking and post exposure to clinical environment for 15 days. Methods: Gutta percha cones, Rubber dam clamps, Impression trays, Dental burs (#245 bur, Access opening bur) were tested.Materials were randomly sampled at 2 time points (t0, at package opening; t1, at 15days) during their clinical usage. Vortexing, centrifuging, streak and inoculation was done. Colony formation under aerobic conditions was observed on media before and after presterilization. Statistical analysis: Wilcoxon matched pairs test was done for comparison of data before and after pre sterilization with status of aerobic organisms at to (immediately after opening) and t1 (during clinical usage). Conclusion: Presterilization effectively eliminates cross contamination of various aerobic microorganisms in conservative and endodontic material immediately unpacked and post exposure to clinical environment for 15 days.

Effects of Dall-Miles Cables on the Cement Mantle in Total Hip Arthroplasty: A Cadaveric Study

2003 ◽  
Vol 13 (1) ◽  
pp. 29-31
Author(s):  
R. Kingston ◽  
J. Noël ◽  
B. Murphy ◽  
T. C Lee ◽  
M.G. Walsh
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hip Arthroplasty ◽  
Ex Vivo ◽  
Cement Mantle ◽  
Control Group ◽  
Before And After ◽  
Diamond Saw ◽  
Ex Vivo Study ◽  
Scanning Electron

Dall-Miles cables are widely used for trochanteric re-attachment in hip arthroplasty, but their effects on the cement mantle have not been reported. We have carried out an ex vivo study to investigate the influence of cables on the mantle. Charnley femoral components were implanted in eight proximal human femora using Palacos cement. Wires (control group, n=4) or 2mm stainless steel Dall-Miles cables (n=4) were passed through holes drilled in the proximal femur before the cement was introduced. The wires or cables were tightened using the appropriate instruments after the cement had hardened. The specimens were sectioned using a diamond saw, and examined by scanning electron microscopy and light microscopy before and after staining with penetrant dye. Deformation of the strands at the tension edge of each cable, with debonding from the cement in two specimens, was observed. There was no damage to cement at the compression edge. Tensioning of Dall-Miles cables passing through Palacos cement does not appear to damage the mantle.

scholarly journals Insertion of magnetically controlled growing rods in a patient with a diaphragmatic pacemaker: case report

2017 ◽  
Vol 43 (4) ◽  
pp. E14 ◽  
Author(s):  
Andrew C. Vivas ◽  
Steven W. Hwang ◽  
Joshua M. Pahys
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injuries ◽  
Muscle Tone ◽  
Cervical Spinal Cord ◽  
Young Patients ◽  
Growing Rods ◽  
Growing Rod ◽  
Cord Injury ◽  
High Cervical ◽  
Magnetically Controlled Growing Rods

Phrenic stimulators offer an alternative to standard mechanical ventilation as well as the potential for ventilator independence in select patients with chronic respiratory failure. Young patients (< 10 years old) with high cervical spinal cord injuries often develop paralytic scoliosis due to loss of muscle tone caudal to their spinal cord lesion. Growing rod systems allow for stabilization of spinal deformity while permitting continued growth of the spine and thoracic cavity. Magnetically controlled growing rods (MCGRs) offer the advantage of noninvasive expansion, as opposed to the operative expansion required in traditional growing rod systems. To the authors’ knowledge, this is the first reported case of MCGRs in a patient with a diaphragmatic pacemaker (DP). A 7-year-old boy with ventilator dependence after a high cervical spinal cord injury presented to the authors’ institution with paralytic scoliosis that progressed to > 120°. The patient had previously undergone insertion of phrenic nerve stimulators for diaphragmatic pacing. The decision was made to insert MCGRs bilaterally to stabilize his deformity, because the planned lengthening surgeries that are necessary with traditional growing rods would be poorly tolerated in this patient. The patient’s surgery and postoperative course were uneventful. The DP remained functional after insertion and lengthening of the MCGRs by using the external magnet. The DP had no effect on the expansion capability of the MCGRs. In conclusion, the MCGRs appear to be compatible with the DP. Further studies are needed to validate the long-term safety and compatibility of these 2 devices.

Maximal Force Generated by Magnetically Controlled Growing Rods at Different Magnetic Controlled Growing Rod Length Decreases with Rod Lengthening

2017 ◽  
Vol 17 (10) ◽  
pp. S178
Author(s):  
Selina Poon ◽  
Hillard T. Spencer ◽  
Vangie Luong ◽  
Jaclyn Krawiec ◽  
Robert Cho
Keyword(s):  
Growing Rods ◽  
Growing Rod ◽  
Maximal Force ◽  
Magnetically Controlled Growing Rods

scholarly journals The Impact of a New “Inverted Arch” Prosthetic Annuloplasty Ring on the Mitral Valve’s 3-D Motion: An Experimental Ex-Vivo Study

2019 ◽  
Vol 6 (2) ◽  
pp. 31
Author(s):  
Philippe Caimmi ◽  
Emmanouil Kapetanakis ◽  
Carla Beggino ◽  
Giovanni Vacca ◽  
Elena Grossini ◽  
...  
Keyword(s):  
Cardiac Cycle ◽  
Ex Vivo ◽  
Three Dimensional ◽  
Mitral Annulus ◽  
Mitral Valve Regurgitation ◽  
Valve Regurgitation ◽  
Distance Measurements ◽  
Before And After ◽  
The Impact ◽  
Ex Vivo Study

This experimental study aimed to evaluate the ex-vivo three-dimensional (3-D) motion of the Inverted Arch Ring (IAR), an innovative new design concept for a flexible incomplete annuloplasty prosthesis with an incorporated stabilizing rigid arch that can be used in correcting mitral valve regurgitation. Twenty explanted porcine hearts were placed in a circulation simulation system. Ultrasonometry transducers implanted in the mitral annulus were used to measure the 3-D valvular motion during a simulated cardiac cycle. Annular distance measurements were recorded and compared in each heart before and after the implantation of the IAR prosthesis at pressures corresponding to mid-systole and mid-diastole. Distances measured in mid-systole and mid-diastole demonstrated no significant differences in annular motion or in valve areas either prior to or after IAR implantation. Therefore, the results of this study confirm the minimal effects exerted by the IAR prosthesis on the mitral valve’s 3-D motion during a simulated cardiac cycle.

scholarly journals Premature spinal fusion after insertion of magnetically controlled growing rods for treatment of early-onset scoliosis: illustrative case

2021 ◽  
Vol 2 (17) ◽  
Author(s):  
Anna H. Green ◽  
Andrzej Brzezinski ◽  
Terrence Ishmael ◽  
Stephen Adolfsen ◽  
J. Andrew Bowe
Keyword(s):  
Spinal Fusion ◽  
Early Onset ◽  
Early Onset Scoliosis ◽  
Illustrative Case ◽  
Body Habitus ◽  
Growing Rods ◽  
Growing Rod ◽  
Magnetically Controlled Growing Rods ◽  
Magnetically Controlled Growing Rod

BACKGROUND Magnetically controlled growing rod (MCGR) systems have gained attention for their use in the treatment of early-onset scoliosis. Although traditional growing rods require frequent operations to lengthen the construct, MCGR allows for fewer open procedures and more frequent distractions by externally controlling rod elongation. Despite its appealing advantages, MCGR is not without limitations. OBSERVATIONS The authors describe a case of premature spinal autofusion before growing rod removal and termination of rod distraction. LESSONS This case highlights the limitations of MCGR systems, including length of use, body habitus restrictions, and risk of autofusion.

Sign in / Sign up

Export Citation Format

Share Document