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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.
Wedges01:24

Wedges

A wedge is a simple machine that serves various purposes, such as adjusting the elevation of structural or mechanical parts, providing stability for heavy objects, and splitting a body into two parts. This versatile tool can amplify an applied force, making it easier to manipulate large or heavy objects.
Consider using a wedge to lift a heavy slab. Here, the wedge functions by converting the applied force into a much larger force directed almost perpendicular to the initial force. This...
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...
Machines: Problem Solving I01:22

Machines: Problem Solving I

A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
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...
Screw: Problem Solving01:21

Screw: Problem Solving

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.
To evaluate the...

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Related Experiment Video

Updated: May 21, 2026

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner
04:41

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner

Published on: June 6, 2025

[Locking attachment plate - first experience].

C W Dumpies1, T Conrad, I Marintschev

  • 1Klinik für Unfall- und Wiederherstellungschirurgie, BG-Kliniken Bergmannstrost, Halle (Saale). christian.dumpies@bergmannstrost.com

Zeitschrift Fur Orthopadie Und Unfallchirurgie
|June 23, 2012
PubMed
Summary
This summary is machine-generated.

The locking attachment plate (LAP) shows promising initial results for treating periprosthetic fractures, potentially enabling early patient mobilization. Further studies are needed to confirm its efficacy in larger patient groups.

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Area of Science:

  • Orthopedic surgery
  • Trauma surgery
  • Implant technology

Background:

  • Periprosthetic fractures are a growing concern in elderly, multi-morbid patients.
  • The locking attachment plate (LAP) is a novel fixed-angle plate fixation system designed for periprosthetic fractures.
  • LAP aims to prevent screw pull-out, stabilize the prosthesis, and facilitate early mobilization.

Purpose of the Study:

  • To evaluate the initial clinical experience and efficacy of the LAP for treating periprosthetic fractures.
  • To determine if the LAP is a valuable addition to the surgical options for periprosthetic fractures.
  • To assess the functional outcomes and implant stability following LAP application.

Main Methods:

  • The LAP was surgically implanted using ORIF technique in 17 patients with femur, tibia, or humerus periprosthetic fractures.
  • Follow-up assessment was conducted for at least 13 months post-surgery.
  • Outcomes included range of motion, pre-traumatic mobility, radiological healing, and implant stability.

Main Results:

  • Two patients were lost to follow-up due to mortality. Two cases (11.8%) experienced infection.
  • Of 15 assessable patients, 11 regained their original range of motion, and 9 regained pre-traumatic mobility.
  • Radiological fracture healing was not observed in 33.3% of cases, but 14 out of 15 implants remained stable without loosening. No material failures occurred.

Conclusions:

  • The LAP demonstrates promising initial outcomes for periprosthetic fractures, supporting early postoperative mobilization.
  • The LAP may become a valuable tool in the surgical management of periprosthetic fractures.
  • Further research with larger patient cohorts is necessary to validate these findings and establish the LAP's role in clinical practice.