The Achilles tendon is one of the strongest tendons in the body, but it is also vulnerable to overuse and repetitive strain, especially in active individuals. When the tendon becomes irritated or degenerative, healing can be slow. PRP injections are used to support recovery by delivering a concentrated portion of your own platelets into the affected tendon. This may help promote collagen remodeling and improve the tendon’s ability to handle load over time. The procedure is typically guided by ultrasound for precise placement. Some patients experience reduced pain and improved function as the tendon heals.

Close up of heel and Achilles tendon area, representing pain or strain in the Achilles region

Achilles tendonitis develops when repeated stress causes microscopic damage to the Achilles tendon, which connects the calf muscles to the heel bone. Over time the tendon may undergo degenerative changes including disrupted collagen fibers, thickening of the tendon, and reduced blood supply within the tissue. This process is often described as tendinosis rather than acute inflammation. The weakened tendon may develop small tears that cause pain during walking, running, or jumping activities. Because the Achilles tendon experiences high mechanical loads, healing can be slow. Treatments such as platelet rich plasma aim to stimulate biological repair processes and encourage stronger collagen fiber organization within the damaged tendon.

A PRP injection for Achilles tendonitis begins with a blood draw of approximately 30 to 60 milliliters from the patient’s arm. The blood is processed in a centrifuge that separates red blood cells from plasma and concentrates platelets within the plasma layer. The resulting platelet rich plasma is then drawn into a sterile syringe. Many orthopedic physicians use ultrasound guidance to identify the damaged portion of the Achilles tendon and guide the needle precisely into the injured tissue. The PRP is injected into the degenerated area of the tendon to deliver growth factors that support tissue repair. The procedure typically takes about 20 to 30 minutes in an outpatient clinic setting.

Physical therapy programs that include eccentric strengthening exercises are commonly used to treat Achilles tendinopathy. These exercises help gradually strengthen the tendon and improve load tolerance. Platelet rich plasma therapy works through a different mechanism by delivering growth factors that may stimulate tendon repair at the cellular level. Some clinical studies have evaluated PRP injections for patients with chronic Achilles tendonitis who have not responded to physical therapy alone. Research results vary, but some patients experience reductions in tendon pain and improvements in activity levels after PRP treatment. Physicians often combine PRP therapy with structured rehabilitation programs to optimize tendon recovery.

Recovery after PRP treatment for Achilles tendonitis usually occurs gradually as tendon healing processes develop. Mild soreness may occur during the first one to two weeks after the injection as the biological repair response begins. Many patients report improvements in tendon pain and mobility between four and eight weeks following treatment. Continued strengthening and rehabilitation exercises are often recommended to support tendon remodeling and prevent reinjury. Clinical observations suggest that some patients continue to experience improvements in tendon function for several months after PRP therapy.

Find doctors offering platelet rich plasma treatment for Achilles tendonitis near you.

This information is educational and not a substitute for professional medical advice. Platelet rich plasma treatments are not FDA approved for all orthopedic uses. Patients should consult a licensed U.S. healthcare professional before pursuing treatment.