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Related Concept Videos

Formation of the Platelet Plug01:22

Formation of the Platelet Plug

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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...
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Clot Retraction and Fibrinolysis01:16

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After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
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Related Experiment Video

Updated: Apr 12, 2026

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

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Platelet-rich plasma does not decrease blood loss in total knee arthroplasty.

Edwin M Tingstad, Sarah N Bratt, Kasee J Hildenbrand

    Orthopedics
    |May 14, 2015
    PubMed
    Summary

    Platelet-rich plasma (PRP) injections during total knee arthroplasty (TKA) did not significantly reduce blood loss or hospital stay. This study found no measurable benefit in using PRP for TKA patients.

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    Area of Science:

    • Orthopedic Surgery
    • Regenerative Medicine

    Background:

    • Total knee arthroplasty (TKA) is a common procedure with potential complications including blood loss and prolonged hospital stays.
    • Platelet-rich plasma (PRP) is a concentration of platelets derived from autologous blood, theorized to promote healing and reduce bleeding.

    Purpose of the Study:

    • To evaluate the efficacy of leukocyte-rich platelet-rich plasma (PRP) in reducing perioperative blood loss and hospital stay in patients undergoing primary total knee arthroplasty (TKA).

    Main Methods:

    • A prospective study involving 102 primary TKAs, with 46 patients receiving intraoperative and wound closure PRP injections (study group) and 47 serving as controls.
    • Standardized surgical techniques were employed, with no tranexamic acid used. Blood loss was measured via surgical recording and drain output; hemoglobin, hematocrit, and length of hospital stay were recorded pre- and postoperatively.

    Main Results:

    • No statistically significant differences were observed in postoperative hemoglobin and hematocrit levels between the PRP group and the control group.
    • Estimated blood loss and the length of hospital stay were comparable between patients who received PRP and those who did not.

    Conclusions:

    • The use of leukocyte-rich PRP during primary total knee arthroplasty does not appear to decrease perioperative blood loss or shorten the length of hospital stay.
    • Further research may be needed to explore specific protocols or patient populations where PRP might offer benefits in TKA.