Platelet-rich plasma (PRP) therapy is a newly developed therapy to treat sports injuries, soft
tissue injuries, and much more. In addition, since it is a relatively new kind of therapy,
researchers are exploring its role in treating other musculoskeletal conditions.
In PRP, doctors take the patient’s blood and then use specific devices to create platelet-rich
plasma (PRP). Thus, they can make a product with a much higher concentration of platelets and
biologically active compounds.
Since the product is made from the patient’s own blood, it is a highly safe therapy. It is especially
good for soft tissue injuries and various sports injuries, as it boosts healing processes (1) .
Here it is vital to understand that although PRP therapy is new, but not the concept. The so-
called autologous blood transfusion has been used in medicine for a long. It has some distinct
benefits over allogeneic blood transfusion (using the donor’s blood), like improved safety profile,
lack of allergic reactions, and much more (2) .
Early studies have also shown that local injection of autologous whole blood may even help
boost regenerative processes (3) . However, using whole blood is inferior to PRP. This is because
red blood cells and other cells are not needed to boost local healing processes and are more likely to cause local inflammation. Thus, using a patient’s blood to create PRP helps produce a more
potent and safer product.
Generally, just a few milliliters of PRP is enough to boost local healing processes, and thus
doctors would extract only a tiny amount of a patient’s blood to produce PRP. Then, once they
have created PRP, they just inject it at the place of injury.
How does PRP work?
PRP contains blood plasma or its liquid part with high amounts of platelets. Platelets play an
essential role in blood clotting and initiating various healing processes after injury. In addition, it
is a natural way in which the body heals. Thus, injecting PRP is more about providing some extra
help to the body’s healing processes.
However, studies show that PRP works mainly due to its high content of various growth factors
with wide-ranging physiological effects. Below are some of the growth factors found in PRP (4) .
ο· PDGF (Platelet-Derived Growth Factor) βplays a vital role in angiogenesis (formation
of microcirculation or small blood vessels), activating macrophages, attracting fibroblasts,
increasing proliferative activity, boosting collagen synthesis, and even increasing
proliferation of bone cells.
ο· IGF-1 (Insulin-like Growth Factor-I) – stimulates local protein production and cell
differentiation and boosts skeletal muscle repair.
ο· TGF-p (Transforming Growth Factor-Ξ²) βis especially good at stimulating the
production of collagen type 1, inhibiting bone reabsorption, and regulating the activity of
myocytes.
ο· PDEGF (Platelet-Derived Endothelial Growth Factor) β Promotes bone healing and
cartilage growth.
ο· PDAF (Platelet-Derived Angiogenic Factor) β Induces vascularization and improves
vascular function.
ο· EGF (Endothelial Growth Factor) β Increases local cell production and differentiation
of epithelial cells.
ο· VEGF (Vascular Endothelial Growth Factor) β Boosts the growth of endothelial
cells, formation of new blood vessels, vasodilation, and other regenerative processes.
ο· HGF (Hepatocyte Growth Factor) β Stimulates growth of liver cells, tissue
regeneration, formation of new blood vessels, and much more.
As one can see, PRP works by providing multiple growth factors to the injury site, and it can
considerably boost local healing processes in trauma and musculoskeletal conditions.
PRP for tendon injury
Doctors traditionally managed tendon injury with RICE therapy (Rest, Ice, Compression,
Elevation), the use of anti-inflammatory drugs, and physiotherapy. In some cases, surgical
correction may help.
However, PRP provides a novel way to boost local regenerative processes. Unlike other methods
that only lower inflammation but do not actively enhance local healing processes. Doctors would
inject the PRP at the site of trauma, and studies show that it can considerably improve healing
without any significant side effects.
Although this is a relatively new treatment strategy, data is emerging that it helps. A systemic
review of clinical studies confirms its efficacy in managing ligament and tendon injury (5) .
PRP for plantar fasciitis
It is a chronic condition of the feet. Anyone who is living with the disease knows how
debilitating the condition is. Since it occurs due to stress on the plantar fascia, managing it is
challenging as walking causes worsening of local inflammation. Pain killers help in the condition, but they often fail to cure, and hence a person has to live with the pain for months and even
years.
Thus, recovery in the condition can be fastened by injected medications or PRP locally in the
feet. Interestingly enough, one of the clinical trials found that PRP is better than corticosteroids
and a much safer option for the conditions. However, plantar fasciitis may require more than
one injection at the site (6) .
PRP appears to have quite a good efficacy in the condition. In yet another clinical trial,
researchers found that it could help in 88% of the cases. Here it is worth understanding that 72%
of the participants had severe and debilitating pain before the procedure (7) .
PRP for osteoarthritis
Osteoarthritis mainly causes joint pain in weight-bearing joints. It is the leading cause of knee
arthritis. Unfortunately, the condition cannot be cured and is progressive. However, medical
therapy may arrest its progress and help reduce pain. Nevertheless, after a few years, medications
may start failing to provide relief to some people. Therefore, doctors may try minimally invasive
therapies like intraarticular hyaluronic acid, corticosteroids, and even PRP in such individuals.
PRP is a relatively new therapy for the condition and is still not in widespread use. However, it is
among the safest options. Moreover, unlike other options, it is the only therapy that may even
promote cartilage growth and tissue regeneration. Thus, it is among the most promising therapeutic approaches (8) .
Although there is still limited data, studies show that it can provide both short-term and long-
term relief in osteoarthritis, and this benefit is supported by many clinical studies (9) .
Moreover, one of the comparative clinical studies shows that PRP is even better than intra-
articular hyaluronic acid injection in the long run. This benefit is shown in a study in 160 patients
with a follow-up period of 12-months (10) .
Final thoughts
There is no doubt that PRP is one of the most effective treatments for promoting the healing of
sports injuries and even arthritis. However, unlike other intra-articular injections, it is less
extensively tested and is relatively new. Thus, only treating doctors can decide the duration of
therapy, the timing of injection, single application, or multiple applications to use, and other
factors (11) .
Additionally, it is worth understanding that the quality of treatment also depends on the devices
used to create PRP. It is because different devices make different levels of platelet concentration.
Additionally, some may remove leucocytes, while others not (4) .
Finally, it is also worth understanding that, unlike corticosteroids or hyaluronic acid, PRP may
cause inflammation post-injection. Thus, there would be an increase in pain for a week or more.
However, once the acute inflammation is over, it would result in much better healing and pain
reduction.
References
- Bava ED, Barber FA. Platelet-Rich Plasma Products in Sports Medicine. The Physician and
Sportsmedicine. 2011 Sep 1;39(3):94β9. - Zhou J. A review of the application of autologous blood transfusion. Braz J Med Biol Res
[Internet]. 2016 Aug 1 [cited 2022 Mar 30];49. Available from:
http://www.scielo.br/j/bjmbr/a/fGMNrMhFpZNdS8nDpP3jksc/?lang=en - Karimzadeh A, Raeissadat SA, Erfani Fam S, Sedighipour L, Babaei-Ghazani A. Autologous whole
blood versus corticosteroid local injection in treatment of plantar Fasciitis: A randomized,
controlled multicenter clinical trial. Clin Rheumatol. 2017 Mar;36(3):661β9. - Middleton KK, Barro V, Muller B, Terada S, Fu FH. Evaluation of the Effects of Platelet-Rich
Plasma (PRP) Therapy Involved in the Healing of Sports-Related Soft Tissue Injuries. Iowa Orthop
J. 2012;32:150β63. - Taylor DW, Petrera M, Hendry M, Theodoropoulos JS. A Systematic Review of the Use of Platelet-
Rich Plasma in Sports Medicine as a New Treatment for Tendon and Ligament Injuries. Clinical
Journal of Sports Medicine. 2011 Jul;21(4):344β52. - AkΕahin E, DoΔruyol D, YΓΌksel HY, Hapa O, DoΔan Γ, Γelebi L, et al. The comparison of the
effect of corticosteroids and platelet-rich plasma (PRP) for the treatment of plantar fasciitis. Arch
Orthop Trauma Surg. 2012 Jun 1;132(6):781β5. - Ragab EMS, Othman AMA. Platelets rich plasma for treatment of chronic plantar fasciitis. Arch
Orthop Trauma Surg. 2012 Aug 1;132(8):1065β70. - Andia I, Maffulli N. Platelet-rich plasma for managing pain and inflammation in osteoarthritis. Nat
Rev Rheumatol. 2013 Dec;9(12):721β30. - Gato-Calvo L, Magalhaes J, Ruiz-Romero C, Blanco FJ, Burguera EF. Platelet-rich plasma in
osteoarthritis treatment: review of current evidence. Therapeutic Advances in Chronic Disease.
2019 Jan 1;10:2040622319825567. - Raeissadat SA, Rayegani SM, Hassanabadi H, Fathi M, Ghorbani E, Babaee M, et al. Knee
Osteoarthritis Injection Choices: Platelet- Rich Plasma (PRP) versus Hyaluronic Acid (A one-year
randomized clinical trial). Clin Med Insights Arthritis Musculoskelet Disord. 2015 Jan
1;8:CMAMD.S17894. - Paoloni J, De Vos RJ, Hamilton B, Murrell GAC, Orchard J. Platelet-Rich Plasma Treatment for
Ligament and Tendon Injuries. Clinical Journal of Sports Medicine. 2011 Jan;21(1):37β45.
