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Related Concept Videos

Upward Impending Motion01:21

Upward Impending Motion

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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
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Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
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A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
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Screw: Problem Solving01:21

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In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
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Space Trusses: Problem Solving01:29

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A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. Due to its adaptability and capacity to withstand complex loads, the space truss is widely used in various construction projects.
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Space Trusses01:25

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A space truss is a three-dimensional counterpart of a planar truss. These structures consist of members connected at their ends, often utilizing ball-and-socket joints to create a stable and versatile framework. The space truss is widely used in various construction projects due to its adaptability and capacity to withstand complex loads.
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Transuncovertebral joint screw placement: technical note.

Tomoyuki Takigawa1, Masato Tanaka2, Takuya Morita2

  • 1Department of Orthopaedic Surgery, Okayama University Hospital, 2-5-1 Shikata-cho, Kita-ku, Okayama City, Okayama, 700-8558, Japan. takigawa2004@yahoo.co.jp.

European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
|December 2, 2015
PubMed
Summary
This summary is machine-generated.

A novel C2-3 transuncovertebral joint screw technique offers a viable alternative for occipitocervical fixation in patients with high-riding vertebral arteries, enabling successful fusion and improved neurological status.

Keywords:
Cervical pedicle screwCervical spineNavigation surgeryTransarticular screwUncovertebral joint

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Area of Science:

  • Neurosurgery
  • Spinal Surgery
  • Orthopedic Surgery

Background:

  • Traditional C2 pedicle screws and C1-2 transarticular screws are rigid fixation methods for occipitocervical instability.
  • Bilateral high-riding vertebral arteries can preclude the use of these standard screw placements.
  • Occipitocervical fixation is crucial for managing instability at the C1-2 level.

Observation:

  • A 67-year-old patient presented with C1-2 instability and myelopathy.
  • The patient's anatomy featured bilateral high-riding vertebral arteries, contraindicating standard screw fixation.
  • A novel C2-3 transuncovertebral joint screw technique was employed under 3D navigation.

Findings:

  • The C2-3 transuncovertebral joint screw was successfully applied bilaterally.
  • The patient experienced an uneventful postoperative course with improved neurological function.
  • Radiographic evidence confirmed successful bony fusion at the operated levels.

Implications:

  • This technique provides a new option for occipitocervical fixation when standard methods are not feasible.
  • The C2-3 transuncovertebral joint screw allows for secure posterior fixation at C2 and C3.
  • This approach may enhance treatment options for complex cervical instability cases.