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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...

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Locking versus standard screw fixation for acetabular cups: is there a difference?

Snir Heller1, Tamar Brosh, Yona Kosashvili

  • 1Orthopedic Surgery Department, Rabin Medical Center, Campus Beilinson, Petah Tikva, Israel. snirheller@gmail.com

Archives of Orthopaedic and Trauma Surgery
|March 8, 2013
PubMed
Summary

Acetabular screws significantly improve primary cup fixation in total hip replacement, especially in patients with poor bone quality. Locked and standard screws offer similar benefits, enhancing stability for osteoporotic fractures.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Materials Science

Background:

  • Total hip replacement is a standard treatment for subcapital hip fractures.
  • Osteoporotic bone can lead to early loosening of acetabular components due to insufficient primary fixation.
  • Press-fit fixation is commonly used for acetabular cups, often augmented with screws.

Purpose of the Study:

  • To evaluate the effect of acetabular screws on primary cup fixation in a simulated osteoporotic bone model.
  • To compare the efficacy of locked versus non-locked screw fixation for acetabular cups.

Main Methods:

  • Three groups of acetabular cups were tested in foam bone blocks using press-fit fixation.
  • Group 1: Press-fit only. Group 2: Press-fit with standard screws. Group 3: Press-fit with cemented (locked) screws.
  • Load was applied to the acetabular component rim, and load-displacement curves were analyzed to determine stiffness.

Main Results:

  • Both standard and locked acetabular screws enhanced cup fixation by 26% compared to press-fit alone (p < 0.01).
  • No statistically significant difference in fixation enhancement was observed between locked and non-locked screws.

Conclusions:

  • Acetabular screws effectively improve primary cup fixation in total hip arthroplasty.
  • This enhancement is particularly beneficial in cases with compromised acetabular bone stock, such as in osteoporotic patients.
  • Locked screw fixation does not offer a significant advantage over standard screw fixation for improving primary cup stability.