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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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Preparation, Procedures and Evaluation of Platelet-Rich Plasma Injection in the Treatment of Knee Osteoarthritis
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Preparation, Procedures and Evaluation of Platelet-Rich Plasma Injection in the Treatment of Knee Osteoarthritis

Published on: January 4, 2019

Platelet-rich plasma differs according to preparation method and human variability.

Augustus D Mazzocca1, Mary Beth R McCarthy, David M Chowaniec

  • 1Department of Orthopaedic Surgery, University of Connecticut Health Center, Farmington, CT 06033, USA. mazzocca@uchc.edu

The Journal of Bone and Joint Surgery. American Volume
|February 17, 2012
PubMed
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Platelet-rich plasma (PRP) separation methods vary in component concentrations. Results show significant differences between methods and wide intra-individual variations, impacting clinical consistency.

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Hematology

Background:

  • Variable component concentrations in platelet-rich plasma (PRP) preparations may explain inconsistent clinical study outcomes.
  • Quantifying cellular and growth factor levels in different PRP systems is crucial for understanding variability.

Purpose of the Study:

  • To quantify platelets, growth factors, red blood cells, and white blood cells in one-step and two-step PRP separation systems.
  • To assess the impact of multiple blood draws on PRP component concentrations.

Main Methods:

  • Evaluated three PRP separation methods (PRPLP, PRPHP, PRPDS) using blood from eight subjects.
  • Assessed concentrations of platelets, red blood cells, white blood cells, and growth factors.
  • Investigated the effect of three repetitive blood draws on PRP components.

Main Results:

  • All methods significantly increased platelet concentration compared to native blood.
  • PRPHP yielded higher platelet and white blood cell concentrations than PRPLP and PRPDS.
  • Significant intra-individual variations in platelet and cell counts were observed across repeated blood draws.

Conclusions:

  • Single-step PRP procedures can yield sufficient platelets for clinical use.
  • Significant differences exist in platelet and white blood cell yields among evaluated PRP separation methods.
  • High intra-individual variability in PRP components necessitates careful consideration for clinical applications.