Effect of Spinous Process Excision on Adjacent Segment Motion: A Biomechanical Study

2009 ◽  
pp. 279-280
Author(s):  
J. Mitgang ◽  
M. Wilker ◽  
M. Gerling
Keyword(s):  
Spinous Process ◽  
Biomechanical Study ◽  
Adjacent Segment

scholarly journals Biomechanical study on the effect of five different lumbar reconstruction techniques on adjacent-level intradiscal pressure and lamina strain

2006 ◽  
Vol 5 (2) ◽  
pp. 150-155 ◽  
Author(s):  
Hideki Sudo ◽  
Itaru Oda ◽  
Kuniyoshi Abumi ◽  
Manabu Ito ◽  
Yoshihisa Kotani ◽  
...  
Keyword(s):  
Interbody Fusion ◽  
Sagittal Alignment ◽  
Biomechanical Study ◽  
Intradiscal Pressure ◽  
Adjacent Segment ◽  
Initial Stiffness ◽  
Flexion Extension ◽  
Fusion Methods ◽  
Local Kyphosis ◽  
The One

Object The objectives of this study were to compare the biomechanical effects of five lumbar reconstruction models on the adjacent segment and to analyze the effects of three factors: construct stiffness, sagittal alignment, and the number of fused segments. Methods Nondestructive flexion–extension tests were performed by applying pure moments to 10 calf spinal (L3–S1) specimens. One-segment (L5–6) or two-segment (L5–S1) posterior fusion methods were simulated: 1) one-segment posterolateral fusion (PLF); 2) one-segment PLF with interbody fusion cages (one-segment PLIF/PLF); 3) two-segment PLF; 4) two-segment PLIF/PLF; and 5) two-segment PLF in kyphosis (two-segment kyphotic PLF). The range of motion (ROM) of the reconstructed segments, intradiscal pressure (IDP), and lamina strain in the upper (L4–5) adjacent segment were analyzed. The ROM was significantly decreased in the PLIF/PLF models compared with that in the PLF alone models after both the one- and two-segment fusions. If the number of fused segments was increased, the pressure and strains were also increased in specimens subjected to the PLIF/PLF procedure, more so than the PLF-alone procedure. In the one-segment PLIF/PLF model the authors observed a reduced IDP and lamina strain compared with those in the kyphotic two-segment PLF model despite the latter’s higher levels of initial stiffness. Conclusions If the number of fused levels can be reduced by using PLIF to correct local kyphosis, then this procedure may be valuable for reducing adjacent-segment degenerative changes.

The Coflex® Versus Fusion US FDA IDE Trial: An In Vivo Biomechanical Study of Adjacent Segment Motion Following Fusion

2012 ◽  
Vol 12 (9) ◽  
pp. S29 ◽  
Author(s):  
William R. Sears ◽  
Reginald J. Davis ◽  
Joshua D. Auerbach
Keyword(s):  
Biomechanical Study ◽  
Adjacent Segment ◽  
Us Fda

scholarly journals Aseptic intrafascial and extrafascial abscesses 10 years after a 2-level DIAM insertion procedure

2015 ◽  
Vol 23 (5) ◽  
pp. 647-651
Author(s):  
Ivan Stefanovic ◽  
Misa Radisavljevic ◽  
Dragan Stojanov
Keyword(s):  
Spinous Process ◽  
Late Complication ◽  
The Body ◽  
Simultaneous Occurrence ◽  
Neurogenic Claudication ◽  
Adjacent Segment ◽  
Mri Findings ◽  
Time Dynamic ◽  
Spine Stabilization ◽  
Interspinous Spacers

With the aim to prevent the so-called adjacent-segment disease in spinal fusion surgery and to serve as the primary surgical procedure for the management of low-back pain syndrome or neurogenic claudication in spinal stenosis, the so-called dynamic spine stabilization is applied using specifically designed implants: interspinous spacers, such as DIAM (Device for Intervertebral Assisted Motion), Coflex, and X-stop. It is commonly accepted that interspinous spacers are made from material that is well tolerated by the body, that their placement is simple, that complications are rare, and that they can greatly benefit the patients. So far, there have not been published studies reporting infective or other complications 10 or more years after the placement of DIAM spacers. The aim of this paper was to present a case of an extremely late complication (after 10 years) in the form of intra- and extrafascial dumbbell abscesses, concomitantly appearing at both levels treated with the DIAM spacer. The paper presents the existence of a significant correlation between CT and MRI findings as well as the deterioration in Oswestry Disability Index and visual analog scale scores. Over time, dynamic spine stabilization might possibly impact reactive accumulation of sterile fluid in the vicinity of an implant and could therefore be related to delayed complications even 10 years after surgery. The finding of a growing layer composed of thick aseptic fluid around the DIAM implant, with a simultaneous occurrence of spinous process osteolysis and formation of a mineralized pseudocyst, bears a considerable risk of delayed inflammatory complications, including abscess, and therefore requires the explantation of the DIAM implant.

Biomechanichal Comparison of Multilevel Cervical Laminectomy and Spinous Process Splitting Laminoplasty With or Without Hydroxyapatite Spinous Process Spacers

2001 ◽  
Author(s):  
Shinichiro Kubo ◽  
Vijay K. Goel ◽  
Yang S. Jo ◽  
Kim J. Hyun ◽  
Naoya Tajima
Keyword(s):  
Spinous Process ◽  
Adjacent Segment Degeneration ◽  
The Other ◽  
Adjacent Segment ◽  
Segmental Instability ◽  
In Vitro Investigation ◽  
Multilevel Cervical Myelopathy ◽  
Biomechanical Factors

Abstract Laminoplasty or laminectomy may is used for the treatment of multilevel cervical myelopathy. However, it has been shown that multilevel laminectomies can lead to segmental instability, kyphosis, perrineural adhesions and late neurological deterioration. [1–4] On the other hand, laminoplasty, seems to preserve motion, and reduces adjacent segment degeneration in a patient. [5–7] The role of biomechanical factors in the differences in outcome for the two procedures is not fully delineated. Our hypothesis is that laminoplasty procedure does not lead to an increase in motion while laminectomy does. An in vitro investigation was undertaken to test this hypothesis.

Stabilizing effect of the rib cage on adjacent segment motion following thoracolumbar posterior fixation of the human thoracic cadaveric spine: A biomechanical study

2019 ◽  
Vol 70 ◽  
pp. 217-222
Author(s):  
Mark D. Rahm ◽  
Daina M. Brooks ◽  
Jonathan A. Harris ◽  
Robert A. Hart ◽  
Jessica L. Hughes ◽  
...  
Keyword(s):  
Biomechanical Study ◽  
Posterior Fixation ◽  
Adjacent Segment ◽  
Rib Cage ◽  
Stabilizing Effect

Case Example: Adjacent Segment Disease: What Is It, and How Is It Rated?

2011 ◽  
Vol 16 (2) ◽  
pp. 8-9
Author(s):  
Marjorie Eskay-Auerbach
Keyword(s):  
Clinical Symptoms ◽  
Lumbar Fusion ◽  
Adjacent Segment Degeneration ◽  
Adjacent Segment Disease ◽  
Adjacent Segment ◽  
Disc Space Narrowing ◽  
Disc Disease ◽  
Disc Space ◽  
Radiographic Findings ◽  
Asymptomatic Patients

Abstract The incidence of cervical and lumbar fusion surgery has increased in the past twenty years, and during follow-up some of these patients develop changes at the adjacent segment. Recognizing that adjacent segment degeneration and disease may occur in the future does not alter the rating for a cervical or lumbar fusion at the time the patient's condition is determined to be at maximum medical improvement (MMI). The term adjacent segment degeneration refers to the presence of radiographic findings of degenerative disc disease, including disc space narrowing, instability, and so on at the motion segment above or below a cervical or lumbar fusion. Adjacent segment disease refers to the development of new clinical symptoms that correspond to these changes on imaging. The biomechanics of adjacent segment degeneration have been studied, and, although the exact mechanism is uncertain, genetics may play a role. Findings associated with adjacent segment degeneration include degeneration of the facet joints with hypertrophy and thickening of the ligamentum flavum, disc space collapse, and translation—but the clinical significance of these radiographic degenerative changes remains unclear, particularly in light of the known presence of abnormal findings in asymptomatic patients. Evaluators should not rate an individual in anticipation of the development of changes at the level above a fusion, although such a development is a recognized possibility.

The Effect of Volarly Angulated Distal Radius Fractures on Forearm Rotation: In Vitro Biomechanical Study

2015 ◽  
Vol 04 (S 01) ◽  
Author(s):  
Masao Nishiwaki ◽  
Mark Welsh ◽  
Louis Ferreira ◽  
James Johnson ◽  
Graham King ◽  
...  
Keyword(s):  
Distal Radius ◽  
Biomechanical Study ◽  
Distal Radius Fractures ◽  
Radius Fractures ◽  
Forearm Rotation
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