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Related Concept Videos

Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...

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Related Experiment Video

Updated: May 12, 2026

Effects of Allogeneic Platelet-Rich Plasma (PRP) on the Healing Process of Sectioned Achilles Tendons of Rats: A Methodological Description
07:51

Effects of Allogeneic Platelet-Rich Plasma (PRP) on the Healing Process of Sectioned Achilles Tendons of Rats: A Methodological Description

Published on: March 19, 2018

Platelet-rich plasma for long bone healing.

Mário Lenza1, Silvia de Barros Ferraz, Dan Carai Maia Viola

  • 1Hospital Israelita Albert Einstein, São Paulo, SP, Brasil.

Einstein (Sao Paulo, Brazil)
|April 13, 2013
PubMed
Summary

Platelet-rich plasma (PRP) shows no conclusive evidence for aiding bone regeneration in fractures or bone defects. Further high-quality research is needed to determine its effectiveness as a coadjuvant treatment.

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Area of Science:

  • Orthopedics
  • Regenerative Medicine
  • Biomaterials

Background:

  • Bone fractures, pseudoarthrosis, and defects require effective treatments for union.
  • Platelet-rich plasma (PRP) is investigated as a coadjuvant to enhance bone healing.
  • Current evidence on PRP's efficacy in bone regeneration remains limited.

Purpose of the Study:

  • To evaluate the effectiveness of platelet-rich plasma (PRP) as a coadjuvant for long bone union.
  • To assess PRP's impact on bone regeneration, adverse events, costs, pain, and quality of life.

Main Methods:

  • Systematic search of Cochrane Library and MEDLINE databases up to December 2011.
  • Inclusion of randomized clinical trials evaluating PRP for long bone union (fractures, pseudoarthrosis, bone defects).
  • Data extraction and methodological quality assessment; meta-analysis was not possible.

Main Results:

  • Two randomized clinical trials with 148 participants were included.
  • One trial compared PRP to bone morphogenetic protein-7 for pseudoarthrosis.
  • Another trial assessed PRP and PRP with bone marrow stromal cells for tibial osteotomies; both studies had low statistical power and high risk of bias.

Conclusions:

  • No conclusive evidence supports the use of platelet-rich plasma (PRP) as a coadjuvant for bone regeneration.
  • Further rigorous studies are necessary to establish PRP's role in treating bone defects and fractures.