Pilot study of oblique lumbar interbody fusion using mobile percutaneous pedicle screw and validation by a three-dimensional finite element assessment

2020 ◽  
Vol 76 ◽  
pp. 74-80
Author(s):  
Yawara Eguchi ◽  
Sumihisa Orita ◽  
Hiroyuki Yamada ◽  
Munetaka Suzuki ◽  
Hajime Yamanaka ◽  
...  
Keyword(s):  
Finite Element ◽  
Pilot Study ◽  
Pedicle Screw ◽  
Interbody Fusion ◽  
Three Dimensional ◽  
Lumbar Interbody Fusion ◽  
Percutaneous Pedicle Screw ◽  
Dimensional Finite Element ◽  
Oblique Lumbar Interbody Fusion ◽  
Three Dimensional Finite Element

scholarly journals Biomechanical effect of cage position combined with bilateral pedicle screw fixation in the osteoporotic lumbar spine of oblique lumbar interbody fusion: a finite element analysis

2021 ◽  
Author(s):  
Yichuan Qin ◽  
Bin Zhao ◽  
Jie Yuan ◽  
Chaojian Xu ◽  
Junqiang Su ◽  
...  
Keyword(s):  
Finite Element ◽  
Lumbar Spine ◽  
Pedicle Screw ◽  
Interbody Fusion ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Lumbar Interbody Fusion ◽  
Cage Subsidence ◽  
Oblique Lumbar Interbody Fusion ◽  
Bilateral Pedicle Screw

Abstract Background: The influence of cage position on postoperative cage subsidence has been paid increasing attention. The best cage position in oblique lumbar interbody fusion (OLIF) is still unclear. This study aimed to evaluate the biomechanical effects of different cage positions with stand-alone (SA) methods and bilateral pedicle screw fixation (BPSF) in the osteoporotic lumbar spine after OLIF.Methods: A finite element (FE) model of an intact L3-L5 lumbar spine was constructed. After validation, an osteoporosis model (OP) was constructed by assigning osteoporotic material properties. SA models (SA1, SA2, SA3) and BPSF models (BPSF1, BPSF2, BPSF3) in which a cage was placed in the anterior, middle and posterior third of the L5 superior endplate (SEP) were constructed at the L4-L5 segment of the OP. The L4-L5 range of motion (ROM), the stress of the L5 SEP, the stress of the cage and the stress of fixation were compared among the different models.Results: According to the degree of ROM of L4-L5, the stress of the L5 SEP and the stress of the cage for most physiological motions, the SA and BPSF models were ranked as follows: SA2＜SA1＜SA3, BPSF2＜BPSF1＜BPSF3. In BPSF2, the stress of fixation was minimal in most motions. At the same cage position, the ROM of L4-L5, the stress of the L5 SEP and the stress of the cage in the BPSF models were significantly reduced compared with those in SA models; compared with SA2, BPSF2 had a maximum reduction of 83.24%, 70.71% and 73.52% in these parameters, respectively.Conclusions: Placing the cage in the middle third of the L5 SEP for OLIF could reduce the maximum stresses of the L5 SEP, the cage and the fixation, which may reduce the risk of postoperative cage subsidence, endplate collapse and fixation fracture in the osteoporotic lumbar spine. Compared with SA OLIF, BPSF could provide sufficient stability for the surgical segment and may reduce the incidence of the aforementioned complications.

scholarly journals Comparison of Simultaneous Single-position Oblique Lumbar Interbody Fusion and Percutaneous Pedicle Screw Fixation with Posterior Lumbar Interbody Fusion using O-arm Navigated C-arm free Technique for Lumbar Degenerative Diseases

2021 ◽  
Author(s):  
Ying Tan ◽  
Masato Tanaka ◽  
Sumeet Sonawane ◽  
Koji Uotani ◽  
Yoshiaki Oda ◽  
...  
Keyword(s):  
Blood Loss ◽  
Pedicle Screw ◽  
Interbody Fusion ◽  
Posterior Lumbar Interbody Fusion ◽  
Lumbar Interbody Fusion ◽  
Surgical Time ◽  
Intraoperative Radiation ◽  
Percutaneous Pedicle Screw ◽  
Indirect Decompression ◽  
Oblique Lumbar Interbody Fusion

Abstract Background: To compare the clinical, surgical and radiographic outcomes of O-arm navigated C-arm free, simultaneous single-position oblique lumbar interbody fusion (OLIF) and percutaneous pedicle screw (PPS) fixation with minimally invasive posterior/ transforaminal lumbar interbody fusion (MI-PLIF/TLIF).Methods: This is retrospective comparative study. The study included 98 patients, 63 in single position OLIF (group SO) and 35 in MI-PLIF/TLIF (group P/T). Surgical time, blood loss, mobilization time after surgery and complications were analyzed for all patients. Clinical evaluation included visual analog scale (VAS) for back pain, oswestry disability index (ODI). Radiological parameters included cage height (CH), cage to disc ratio (CDR), DH change, pre and postoperative disc height (DH), foraminal height (FH), foraminal area (FA), segmental lordosis (SL). Results: In group SO (vs group P/T), surgical time, blood loss and mobilization time were 117.7± 34.1 minutes (171.8 ± 40.6 minutes, p<0.000001), 139.2 ± 82.0 ml (vs. 374.2 ± 247.7 ml, p<0.000001) and 2.7 ±1 .0 days (vs 3.9 ± 2.4 days, p<0.000001) respectively. The CH, CDR, DH change and postoperative DH, FH, FA increase were statistically significant in group SO compared to group P/T. VAS and ODI improvement were similar in both groups. Mobilization time is shorter in group SO. Total complication rate in group SO was 7% while that in group P/T was 11%. Conclusions: Simultaneous single position O-arm navigated C-arm free OLIF reduces the surgical time, blood loss, mobilization time after operation without the risk of an adverse event of intraoperative radiation to operating staff. Good indirect decompression can be achieved with this method. Clinical results were similar in both groups.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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