The Holding Strength of Cannulated Screws Compared with Solid Core Screws in Cortical and Cancellous Bone

Leggon, Robert E.; Lindsey, Ronald W.; Doherty, Brian J.; Alexander, Jamie; Noble, Phil

doi:10.1097/00005131-199310000-00008

Cited by 42 publications

(27 citation statements)

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“…Its significance has been experimentally proven in many cases [7,8,11,13,[15][16][17]. It is even proved (using custom made screws) [8,11,17] that the correlation between the outer radius of a screw and its pullout force is linear.…”

Section: Discussionmentioning

confidence: 99%

“…Especially for the screw design and its influence on the pullout force many experimental [6][7][8][9][10][11][12][13][14][15][16][17][18] and numerical [19][20][21][22][23][24] studies have been carried out. Additionally some researchers have attempted to quantify the factors that influence the pullout force of a bone screw using equations developed for "machine" screws (i.e.…”

Section: Introductionmentioning

confidence: 99%

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A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

Chatzistergos

Magnissalis

Kourkoulis

2010

Medical Engineering & Physics

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Abstract:The present study aims to the design of a finite-element model simulating accurately the pullout behaviour of cylindrical pedicle screws and predicting their pullout force. Three commercial pedicle screws, subjected to pure pullout from synthetic bone, were studied experimentally. The results were used for the design, calibration and validation of a finite-element model. Special attention was paid to the accurate simulation of the failure inside the host material. For this purpose a bilinear cohesive zone material model was adopted to control mode-II debonding of neighbouring elements in the vicinity of the screw and simulate this way the failure in shear of the hosting material. Comparison between experimental and numerical results proved that the implementation of this method can significantly enhance the accuracy of the numerical simulation of a screw's mechanical behaviour under pure pullout loads. The numerical model was used for the parametric study of various factors affecting the pullout performance of a cylindrical pedicle screw. It was concluded that the major parameters influencing the pullout force is the outer radius and purchase length of the screw. Significantly weaker was the dependence of the screw's pullout force on its thread inclination, depth and pitch.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

Chatzistergos

Magnissalis

Kourkoulis

2010

Medical Engineering & Physics

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“…However, these traditional fusion techniques fail due to screw “pull-out” from occiput,[4] screw fracture, and subaxial delayed instability with degenerative changes. [5] These risks are greater with osteoporosis or osteopenia and in extensively instrumented constructs.…”

Section: Discussionmentioning

confidence: 99%

A modified transcondylar screw to accommodate anatomical skull base variations

Ghaly¹,

Lissounov²

2017

Surg Neurol Int

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Background:Occipitocervical instability may be attributed to congenital, bony/ligamentous abnormalities, trauma, neoplasm, degenerative bone disease, and failed atlantoaxial fixation. Indications for occipitocervical fixation include the prevention of disabling pain, cranial nerve dysfunction, paralysis, or even sudden death.Methods:The screw trajectory for the modified transcondylar screw (mTCS) is optimally planned utilizing a three-dimensional skull reconstructed image.Results:The modified mTCS technique is helpful where there is a loss of bone, such as after prior suboccipital craniotomy and/or an inadequate occipital condyle. The new proposed technique is similar to the classical transcondylar screw placement but follows a deeper course along the bony lip of foramen magnum toward clivus from a dorsolateral approach.Conclusion:The modified mTCS technique allows for direct visualization and, therefore, helps to avoid damage to the hypoglossal nerve and lateral aspect of brain stem.

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“…Leggon et al [11] conducted testing comparing cannulated with solid-core screws in cortical and cancellous bone. This study concluded that holding power is similar for cannulated and solid-core screws of similar size and in similar types of bone.…”

Section: Discussionmentioning

confidence: 99%

“…The cannulated bone screw has several advantages: (a) guide pins can be used for provisional fixation, allowing more accurate placement of the screws, (b) cannulated screw placement consists of fewer steps compared with the lag screw technique, and (c) the cannulated screw reduces the chance of angulational errors because there is no need to view the instrumentation in three dimensions [10][11][12]. To our knowledge, there are only two papers about the use of cannulated screws in the maxillofacial region: one reporting the use of cannulated screws to treat a condylar fracture [13] and another comparing the performance of cannulated screws with other fixation methods on mandibular symphysis fractures [14].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and photoelastic analysis of conventional screws and cannulated screws for sagittal split osteotomy fixation: a comparative study

Lima

Falci

Rodrigues

et al. 2015

Oral Maxillofac Surg

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The Holding Strength of Cannulated Screws Compared with Solid Core Screws in Cortical and Cancellous Bone

Cited by 42 publications

References 0 publications

A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

A parametric study of cylindrical pedicle screw design implications on the pullout performance using an experimentally validated finite-element model

A modified transcondylar screw to accommodate anatomical skull base variations

Mechanical and photoelastic analysis of conventional screws and cannulated screws for sagittal split osteotomy fixation: a comparative study

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