Platelet-rich plasma (PRP) (also known as blood injection therapy)) is a medical treatment being used for a wide range of musculoskeletal problems. Platelet-rich plasma refers to a sample of serum (blood) plasma that has as much as four times more than the normal amount of platelets. This treatment enhances the body’s natural ability to heal itself and is used to improve healing and shorten recovery time from acute and chronic soft tissue injuries.
It has been used for years after plastic surgery and surgery on the mouth, jaw, and neck. It seems to promote bone graft healing. Researchers have found a way to combine this substance with other chemicals to make it into a putty or gel that can be painted on a surgical site to speed up healing.
Blood injection therapy of this type has been used for knee osteoarthritis, degenerative cartilage, spinal fusion, bone fractures that don’t heal, and poor wound healing. This treatment technique is fairly new in the sports medicine treatment of musculoskeletal problems, but gaining popularity quickly.
This guide will help you understand
- What your surgeon hopes to achieve
- Who can benefit from this procedure
- What happens during the procedure
- What to expect as you recover
In theory, blood injection therapy could be used in any area where a rapid healing response is desired such as the tendon-muscle junction, muscle injuries, torn ligaments, damaged joints, or inflamed tissue (e.g., plantar fasciitis). Torn tendons and ligaments don’t always heal well because they have a poor blood supply. Connective tissues such as ligaments and tendons heal by filling in with scar tissue that doesn’t bear the brunt of large loads well. This increases the risk of re-injury. Other available treatments for chronic tendon problems do not necessarily improve the tendon’s ability to heal in the same way that PRP does. And injections of PRP don’t have the side effects that can occur with steroid injections or long-term use of non-steroidal anti-inflammatory drugs (NSAIDs).
PRP treatment might also be used on the skin where delayed wound healing has created a site open to infection or for a pressure ulcer that is open and draining. Patients with non-healing ulcers from poor circulation related to diabetes, paralysis and immobility, and chronic neurologic disorders may be able to receive gel treatments to achieve healing.
Since the early 1990s, it has been injected into non-healing tendon tears, fibrosed (scarred) tendons, and osteoarthritic knees. There has been some limited use with bone fractures. Because the growth factors released by the platelets can stimulate bone mineralization, platelet-rich plasma may help a break in a bone that isn’t healing. It has also been used with bone grafts to help spinal fusion along.
What do surgeons hope to achieve?
The main purpose of platelet-rich plasma injection is to foster healing where it has not otherwise occurred or to speed up healing as in the case of an acute injury. Platelets release bioactive proteins that enhance tissue regeneration and healing. For example, studies show that after using the platelet-rich plasma (PRP) for tendon problems, new tendon cells (called tenocytes) start to develop in the area treated. Chondrocytes (cartilage cells) form when PRP is injected into damaged cartilage. Growth factors that help build new blood supply to the area are also increased in number. At the same time, there is a build up of type I collagen fibers. Type I collagen makes up the base structure of tendon tissue. This healing response may help restore strength faster than normal but studies are needed to prove this.
Not everyone with a musculoskeletal problem as described can have this treatment. Anyone with a condition called thrombocytopenia (low platelet levels), anyone with a history of cancer, and women who are pregnant or breast-feeding will not qualify. Thrombocytopenia can occur with drug treatment for blood clotting disorders, rheumatoid arthritis, or some forms of chemotherapy for cancer. The use of blood thinners such as Coumadin or Warfarin and the presence of infection in the wound site are also contraindications (reasons why platelet-rich plasma is not an option for you).
How should I prepare for surgery?
Treatment with platelet-rich plasma is broken down into two steps: preparing the platelet-rich plasma for injection and then injection into the affected area. First, blood is drawn from your arm and used to create the injected fluid. The blood is placed (in a test tube) in a machine called a centrifuge. The centrifuge spins the blood fast enough to separate it into layers based on weight. Heavier parts (e.g., red blood cells) stay on the bottom. Platelets and white blood cells spin out just above the red blood cell layer. Lighter particles (plasma without platelets or blood cells) make up the top layer in the test tube.
Once you have had your blood drawn, the sample is prepared right away. You can have the injection as quickly as 30 minutes later.
What happens during the procedure?
Once the PRP has been prepared, it is injected into the damaged area (e.g., tendon, muscle, cartilage, joint, bone). The surgeon may use imaging such as fluoroscopy (real-time, 3-D X-rays) or dynamic musculoskeletal ultrasound to place the needle that delivers the PRP directly into the joint or other area of injury. You will not be asleep or anesthetized unless the plasma is applied during a surgical procedure. When used on an outpatient basis for a nonsurgical treatment, a numbing agent like novacaine (e.g., lidocaine, marcaine) is used so that you don’t feel anything.
For open incision or arthroscopic surgeries, such as labral and meniscal repairs or tendon or ligament repairs, the PRP is placed around the anchors and sutures holding the soft tissues together. Tiny clots form quickly, then the surgeon ties the sutures down reducing the tear, thus trapping the PRP clot in the repair site.
Early attempts to use this procedure contained four times the normal amount of platelets but surgeons have found they can use far less than that to achieve the same result. Scientists are still actively studying the best way to use this treatment. It’s not clear yet just how much platelet-rich plasma is needed to get the best healing response. The number of injections needed and the time frame remain yet to be determined as well. In studies done so far, one to three injections have been used with one to two weeks between injections.
What might go wrong?
There’s little concern about reactions to the blood, transfer of infection or HIV, or getting cancer cells through someone else’s blood because you donate your own blood to use in the procedure. Donor blood products might be used for individuals with medical issues that prevent them from donating their own blood. Donated blood is carefully screened, so again, the risk of infection or reaction to the blood is very low. The worst that might happen with this treatment is that you won’t get any better or more rarely, the needle might go through a blood vessel or nerve causing bleeding or nerve damage.
With other types of injection treatment, scar tissue and calcification (formation of tiny calcium deposits) can occur around the injection site. This has not been reported with platelet-rich plasma injections, but it is theoretically possible. Also possible but uncommon are allergic reactions to the lidocaine or marcaine used as a numbing agent.
After the Procedure
What should I expect as I recover?
Immediately after the procedure, you will remain lying down and under observation for a few minutes up to a half an hour. You might have some discomfort in the area of the injection that can last a few days up to a week. In fact, sometimes it can seem like you are worse than before the treatment. That’s because an inflammatory response has just been stimulated. Don’t worry – the temporary worsening of your symptoms usually won’t last.
Once you return home, you can use ice over the injected area, elevate the leg or arm, and limit your activities as much as needed to remain comfortable. Your doctor may suggest using Tylenol for pain relief but ibuprofen or other anti-inflammatories are not advised. That’s because the treatment is designed to set up an inflammatory response, so you don’t want to stop that process with medications.
This depends on the type of surgery performed. Please follow your surgeon’s instructions.
What should I expect as I recover?
Similar findings have been observed in a small number of patients participating in a pilot study when platelet-rich plasma was used during surgery to repair ruptured Achilles tendons and rotator cuff tears. Once again, wound healing was much faster with fewer problems and less scar tissue. The majority of patients report being pain free. And the list of improvements with this treatment continues: patients use less pain medication, patients gain greater joint motion over a shorter period of time, patients get back to regular daily activities with greater speed and ease, and so on.
In some programs where platelet-rich plasma injections have been used for tendon problems, patients were allowed to do light activities after a second injection given 15 days after the first injection. Strengthening exercises were started after a third (and final) injection given 15 days after the second injection.
You may see a physical therapist after this procedure to help you regain motion, strength, motor control, and function. There isn’t a known rehab protocol (standard program to follow) yet. Physical therapists are working with surgeons on a patient-by-patient basis to determine what might be best for each individual. Developing optimal tendon healing and muscle strength, will be a priority especially in high-level professional athletes who are eager to get back into the game.