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Related Concept Videos

Self-Locking Screw01:16

Self-Locking Screw

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.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Frictional Forces on Screws01:17

Frictional Forces on Screws

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.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
Steel Fastening Techniques01:17

Steel Fastening Techniques

Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
Bolting is another...
Method of Sections: Problem Solving I01:27

Method of Sections: Problem Solving I

Consider a symmetrical roof truss structure, composed of vertical, diagonal, and horizontal members. The length of each horizontal member is 4 m. The lengths of the vertical members FB and HD are 4 m, while the length of member GC is 6 m. The loads acting at joints F, G, and H are 2 kN, while those at joints A and E are 1 kN.
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
Sutures of the Skull01:22

Sutures of the Skull

The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
Sutures are immobile joints between adjacent bones of the skull. The narrow gap between the bones is filled with dense, fibrous connective tissue that unites the bones. The long sutures located between the skull bones are not straight but instead follow irregular, tightly twisting paths. These twisting lines tightly...

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Optimizing Minimally Invasive Spine Surgery: A Fully 3D CT O-Arm Navigated Workflow in MIS TLIF
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Internal headless compression screw method for 4-corner fusion.

Mark Henry1

  • 1Hand and Wrist Center of Houston, 1200 Binz Street, 13th Floor, Houston, TX 77004 USA.

Journal of Hand and Microsurgery
|November 7, 2012
PubMed
Summary
This summary is machine-generated.

This study presents a reliable technique for four-corner fusion (midcarpal fusion and scaphoidectomy) to treat wrist arthritis, aiming to reduce nonunion and hardware complications.

Keywords:
ArthritisFusionMidcarpalScrewsTechniqueWrist

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Area of Science:

  • Orthopedic surgery
  • Hand and wrist surgery

Background:

  • Four-corner fusion (midcarpal fusion and scaphoidectomy) is a standard treatment for post-traumatic wrist arthritis, including scapholunate advanced collapse and scaphoid nonunion advanced collapse.
  • Traditional fixation methods using Kirschner wires have been associated with high nonunion rates and specific complications.
  • Recent literature emphasizes the impact of fixation methods on fusion outcomes.

Purpose of the Study:

  • To present a reliable surgical technique for four-corner fusion.
  • To minimize nonunion rates associated with the procedure.
  • To reduce hardware-related complications in wrist fusion.

Main Methods:

  • Detailed description of a refined surgical technique for four-corner fusion.
  • Focus on fixation methods and bone grafting strategies.
  • Emphasis on achieving a solid fusion mass with minimal complications.

Main Results:

  • The presented technique is designed for reliability and reproducibility.
  • Aims to significantly decrease the incidence of nonunion.
  • Intended to lower the occurrence of hardware-related issues.

Conclusions:

  • The described technique offers a reliable approach to four-corner fusion.
  • It provides a method to mitigate common complications, improving patient outcomes.
  • This technique aims to enhance the success rate of midcarpal fusion for wrist arthritis.