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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Related Experiment Video

Updated: Mar 7, 2026

Direct and Indirect Culture Methods for Studying Biodegradable Implant Materials In Vitro
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Direct and Indirect Culture Methods for Studying Biodegradable Implant Materials In Vitro

Published on: April 15, 2022

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New developments in the application of biodegradable implants.

K E Rehm1, H J Helling1, C Gatzka1

  • 1Klinik und Poliklinik für Unfall-, Hand- und Wiederherstellungschirurgie, Universität zu Köln, Germany.

Der Orthopade
|March 2, 2017
PubMed
Summary
This summary is machine-generated.

Biodegradable implants, like polyactide (PLA) pins, offer comparable stability to traditional metal K-wires for certain fractures. Studies show no significant difference in outcomes or complications, making them a viable option with potential cost benefits.

Keywords:
Distal radius fractureKey words BiodegradationMedial ankle fracturePolylactideRadial head fracture

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Medical Device Engineering

Background:

  • Biodegradable implants present unique advantages and disadvantages in medical applications.
  • Polypin® (PLA) has shown promise for low-load osteochondral fracture fixation.
  • Comparative studies are essential to evaluate their clinical efficacy against traditional materials.

Purpose of the Study:

  • To evaluate the mechanical stability and clinical outcomes of biodegradable polyactide (PLA) implants compared to traditional metal implants.
  • To assess the suitability of PLA implants for specific orthopedic fracture fixation, including distal radius and radial head fractures.
  • To analyze the cost-effectiveness and resorption profile of PLA implants.

Main Methods:

  • A prospective, randomized study involving 183 patients with radial head fractures was conducted.
  • Mechanical stability of 2.7 mm Polypin® (PLA) was compared to 1.8 mm K-wires for distal radius fractures.
  • Two-year follow-up was performed to assess results and complications for both metal and polyactide implants.

Main Results:

  • The primary mechanical stability of distal radius fractures fixed with 2.7 mm Polypin® was comparable to 1.8 mm K-wires.
  • No significant differences in clinical outcomes or complication rates were observed between metal and polyactide implants in 183 radial head fractures over two years.
  • Oriented polyactide screws demonstrated good clinical results, although resorption occurred late (5-7 years).

Conclusions:

  • Polyactide (PLA) implants are recommended for radial head fractures and comparable indications due to comparable efficacy and potential cost reduction.
  • While offering innovative solutions, the slow resorption rate of some PLA devices needs consideration.
  • Biodegradable implants represent a promising advancement in orthopedic fixation, balancing innovation with clinical outcomes.