Biomechanical Evaluation of a Double-Threaded Pedicle Screw in Elderly Vertebrae

Mummaneni, Praveen V.; Haddock, Sean M.; Liebschner, Michael A. K.; Keaveny, Tony M.; Rosenberg, William S.

doi:10.1097/00024720-200202000-00012

Cited by 38 publications

(34 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rate of 5 mm/min, however, is commonly used. 13,15,[22][23][24][25][26]28,29 Screw stability is highly dependent on (1) the bone quality of the vertebra and the shape of the pedicle, (2) the insertion technique and (3) the screw design and its parameters. The bone-holding strength of the patients with the osteoporosis can be improved using the PMMA.…”

Section: Discussionmentioning

confidence: 99%

“…14,[18][19][20] There are several researchers that have also investigated the effect of other factors, such as the screw hubbing, screw lengths and thread shapes. [21][22][23][24][25] The purpose of this study is to compare the pullout strengths of all available commercial pedicle screw designs including the cylindrical, conical with a tapered inner diameter (ID), conical with tapered inner and outer diameters, dual inner core and dual outer core designs in addition to a novel design in full insertion and 360°backed-out conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison study of the pullout strength of conventional spinal pedicle screws and a novel design in full and backed-out insertions using mechanical tests

Amaritsakul

Chao

Lin

2014

Proc Inst Mech Eng H

View full text Add to dashboard Cite

Recently, new pedicle screw designs have been developed. However, these designs' performances are still unclear, especially when backed out after insertion. The objective of this study was to investigate the performances of different screw designs when backed out from full insertion. Seven conventional designs of the pedicle screw and one novel design were inserted into polyurethane foam (0.32 g/cm(3)). All screws were first fully inserted (43 mm) and were backed out 360°. Axial pullout tests were performed and the reaction force was measured. The results showed that the conical screw of type 1 with a small inner diameter provided the highest pullout strength in both full insertion and backed-out insertion (2401.85 and 2169.82 N, respectively). However, this screw's pullout strength significantly decreased (9.7%) when backed out from full insertion. There was no significant difference between the conical screw of type 1 with a small inner diameter and double duo core screw (p > 0.01) in backed-out insertion. The cylindrical screw with a small diameter, dual inner core screw and double dual core screw also provided good results in both full insertion (2115.44, 2182.99 and 2226.93 N, respectively) and backed-out conditions (2065.80, 2014.28 and 1941.29 N, respectively). The increased pullout strength of the conical design could be due to the effect of bone compaction. However, the screw exhibited less consistent pullout strength when backed out when compared with the other designs. The conical screw should be inserted to the precise position without turning back, especially in osteoporosis patients. The dual inner core screw and double dual core screw could provide greater stability in both conditions. Care should be taken when using both the cylindrical screw with a small thread depth and the dual outer core screw.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison study of the pullout strength of conventional spinal pedicle screws and a novel design in full and backed-out insertions using mechanical tests

Amaritsakul

Chao

Lin

2014

Proc Inst Mech Eng H

View full text Add to dashboard Cite

show abstract

“…Following thawing of the vertebrae at room temperature, all soft tissues were removed and the vertebrae were split into halves through spinous processes. [13][14][15] In order to dilate pedicles, custom-made stainless steel dilators were used (Figure 1). Each dilator was 15 cm long and had a polished surface.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Pedicle Expansion on Pedicle Morphology and Biomechanical Stability in the Immature Porcine Spine

Yazıcı¹,

Pekmezci²,

Çil³

et al. 2006

Spine

View full text Add to dashboard Cite

show abstract

“…17 Figure 9). Compared to the nonaugmented CPS, the PMMA-augmented CICPS and OPS exhibited significantly increased values of pullout strength (by 328.1 and 244.7%, respectively) and torque (by 845.0 and 783.2%, respectively).…”

Section: Finite Element Analysismentioning

confidence: 99%

Biomechanical and finite element analyses of bone cement‐Injectable cannulated pedicle screw fixation in osteoporotic bone

Liu

Sun

et al. 2015

J Biomed Mater Res

View full text Add to dashboard Cite

The objectives of this study were to investigate the safety and biomechanical stability of a polymethylmethacrylate (PMMA)-augmented bone cement-injectable cannulated pedicle screw (CICPS) in cancellous bone model, and to analyze the stress distribution at the screw-cement-bone interface. The OMEGA cannulated pedicle screw (OPS) and conventional pedicle screw (CPS) were used as control groups. Safety of the CICPS was evaluated by the static bending and bending fatigue tests. Biomechanical stability was analyzed by the maximum axial pullout strength and maximum torque tests. Stress distribution at the screw-cement-bone interface was analyzed by the finite element (FE) method. The CICPS and CPS produced statistically similar values for bending stiffness, bending structural stiffness, and bending yield moment. The maximum pullout force was 53.47 ± 8.65 N in CPS group, compared to 130.82 ± 7.32 N and 175.45 ± 43.01 N in the PMMA-augmented OPS and CICPS groups, respectively (p < 0.05). The CICPS had a significantly greater torque than the OPS and CPS. The FE model did not reveal excessive stress at the screw-cement-bone interface in the CICPS group. In conclusion, PMMA-augmentation with CICPS may be a potentially useful method to increase the stability of pedicle screws in patients with osteoporosis. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 960-967, 2016.

show abstract

Biomechanical Evaluation of a Double-Threaded Pedicle Screw in Elderly Vertebrae

Cited by 38 publications

References 25 publications

Comparison study of the pullout strength of conventional spinal pedicle screws and a novel design in full and backed-out insertions using mechanical tests

Comparison study of the pullout strength of conventional spinal pedicle screws and a novel design in full and backed-out insertions using mechanical tests

The Effect of Pedicle Expansion on Pedicle Morphology and Biomechanical Stability in the Immature Porcine Spine

Biomechanical and finite element analyses of bone cement‐Injectable cannulated pedicle screw fixation in osteoporotic bone

Contact Info

Product

Resources

About