Why Your Achilles Isn't Healing and the Role of PRP for Achilles Tendonitis

Achilles tendonitis can derail your workouts, slow you down on the track, or keep you off your feet entirely. If rest, ice and stretching haven't done the trick, you may wonder why your Achilles still hurts—and whether advanced treatments like PRP for Achilles tendonitis are worth considering. This guide breaks down common reasons for stalled healing, explains how PRP works, and lays out sensible next steps.

---

Why Achilles Tendonitis Can Become Chronic

1. Poor Blood Supply

   • The mid-portion of the Achilles tendon has limited blood flow.
   • Less blood means fewer nutrients and healing cells reach the damaged area.

2. Overuse and Biomechanics

   • Repetitive stress (running, jumping) can outpace your body's repair.
   • Flat feet, tight calves, or high arches alter loading on the tendon.

3. Inadequate Rest or Too Much Rest

   • Pushing through pain delays healing.
   • Conversely, total immobilization weakens the tendon and calf muscles.

4. Muscle Imbalances

   • Tight or weak calf muscles place extra load on the tendon.
   • Hip or core weakness can also change your gait and strain your Achilles.

5. Age and Tissue Quality

   • Tendons become stiffer and less elastic with age (especially after 35).
   • Healing slows down, and microtears accumulate over time.

6. Misdiagnosis or Overlooked Problems

   • Posterior ankle impingement, bursitis or partial tears can mimic tendonitis.
   • Imaging (ultrasound or MRI) may be needed to confirm the exact issue.

---

Standard Treatments Before Considering PRP

Before exploring platelet-rich plasma (PRP), most physicians recommend:

• Relative Rest
  Reduce high-impact activities but keep gentle movement.

• Ice and Heat
  Ice after activity to reduce inflammation; heat before workouts to loosen tissue.

• Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)
  Short-term use can ease pain. Long-term use may interfere with tendon repair.

• Eccentric Strengthening Exercises
  Heel drops on a step (slow lowering) are a gold standard for Achilles rehab.

• Stretching and Flexibility Work
  Calf stretches, foam rolling and ankle mobility drills.

• Orthotics or Heel Lifts
  Correct foot mechanics and offload the tendon.

• Physical Therapy
  Hands-on techniques, taping, ultrasound therapy and individualized exercise plans.

If you've diligently followed these steps for 3–6 months with little relief, it's reasonable to discuss advanced options.

---

What Is PRP for Achilles Tendonitis?

Platelet-rich plasma (PRP) is an injection-based therapy that uses your own blood components to promote healing:

1. Blood Drawn from Your Arm
   A small sample (15–60 mL) is taken, similar to a routine blood test.

2. Centrifuge Separation
   The sample spins at high speed to concentrate platelets into a small volume of plasma.

3. Platelet-Rich Plasma Collected
   Platelets contain growth factors and signaling proteins that may aid tissue repair.

4. Ultrasound-Guided Injection
   Your doctor precisely injects PRP into the damaged portion of the Achilles tendon.

Key benefits of PRP:

• Uses your own blood—minimal risk of allergic reaction
• Can potentially accelerate healing in low-blood-flow areas
• May reduce pain and improve function without steroids

Limitations to keep in mind:

• Results vary; not everyone responds the same way
• Typically requires 1–3 injections spaced weeks apart
• Out-of-pocket costs can be high (often $500–$2,000 per injection)
• Evidence is still evolving; studies show mixed outcomes

---

Who Is a Good Candidate for PRP?

Ideal candidates for PRP for Achilles tendonitis:

• Persistent pain despite 3–6 months of conservative care
• Moderate to severe tendon degeneration on imaging (ultrasound or MRI)
• No active infection or bleeding disorder
• Realistic expectations about time frame and possible need for additional treatments
• Willingness to follow post-injection rehabilitation

Not recommended if you have:

• Complete Achilles rupture (usually requires surgery)
• Active skin infection at the injection site
• Severe systemic illness or uncontrolled diabetes
• Platelet disorders or are on certain blood thinners

---

The PRP Procedure and Recovery Timeline

1. Pre-Injection Consultation

   • Review medical history and imaging
   • Discuss risks, benefits and alternative options

2. The Injection Day

   • Takes about 30–60 minutes total
   • Minimal pain with local anesthesia

3. Immediate Post-Injection Care

   • Rest 24–48 hours; gentle range-of-motion exercises only
   • Avoid NSAIDs for at least one week (they may blunt the platelet effect)

4. Gradual Rehabilitation

   • Week 1–2: Light stretching and isometric calf contractions
   • Week 3–6: Begin eccentric heel-drop exercises and low-impact activities (cycling, swimming)
   • Week 6–12: Progress to jogging, plyometrics and sport-specific drills

5. Follow-Up

   • Repeat PRP sessions if recommended (often 1–2 more injections)
   • Reassess pain and function at 3 and 6 months

---

Potential Risks and Side Effects

PRP is generally safe, but you should be aware of possible complications:

• Temporary increase in pain and swelling at the injection site (1–3 days)
• Infection (rare if proper sterile technique is used)
• No improvement or incomplete healing
• Bleeding or bruising in patients on blood thinners

---

Other Advanced or Alternative Treatments

If PRP is not suitable or you want to explore all options, consider:

• Extracorporeal Shockwave Therapy (ESWT)
  Sound waves target the tendon to stimulate healing.

• Prolotherapy
  Injection of dextrose solution to trigger a mild inflammatory response.

• Topical Nitric Oxide Patches
  May increase blood flow and aid collagen production.

• Surgical Options
  Debridement or tendon augmentation for severe, chronic cases.

• Biologics and Stem Cells
  Emerging treatments still under clinical study.

---

When to Re-Evaluate or Seek Further Care

• No improvement after 6–12 months of combined conservative and PRP treatment
• Increasing pain, redness or warmth (signs of infection)
• New weakness or sudden inability to bear weight (possible tendon tear)
• Concerns about underlying conditions (e.g., arthritis, nerve entrapment)

If your symptoms persist and you're not sure whether your pain is actually Achilles-related, try Ubie's free AI-powered Achilles tendon pain symptom checker to help identify potential causes and guide your next steps toward proper treatment.

---

Take-Home Message and Next Steps

• Chronic Achilles tendonitis often reflects a mix of poor blood flow, overuse, biomechanics and age-related tissue changes.
• Standard care—rest, ice, NSAIDs, eccentric exercises and physical therapy—remains the foundation.
• PRP for Achilles tendonitis can be a useful next step: it harnesses your own growth factors to potentially boost healing.
• Results are variable; discuss candidly with your doctor about costs, risks and realistic expectations.
• If PRP isn't right for you, other options include shockwave therapy, prolotherapy or, in severe cases, surgery.

Always speak to a qualified healthcare provider about any persistent or worsening symptoms. If you experience sudden severe pain, inability to walk, or signs of infection, seek medical attention promptly—these issues can be serious and may require immediate care.