Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

What Is Achilles Tendon Calcification?

Achilles tendon calcification (calcific tendinopathy or enthesopathy) refers to the deposition of calcium hydroxyapatite crystals within the Achilles tendon tissue or at its insertion point on the heel bone (calcaneus). This process occurs in response to chronic degenerative changes in the tendon — often as a consequence of insertional Achilles tendinopathy, Haglund’s deformity, or systemic conditions like calcium pyrophosphate deposition disease (CPPD).

At Balance Foot & Ankle in Howell and Bloomfield Township, Michigan, calcific tendinopathy of the Achilles is a challenging condition that we manage across the full treatment spectrum — from conservative care to minimally invasive and surgical options.

Why Does Calcium Deposit in the Achilles Tendon?

The exact mechanism isn’t completely understood, but leading theories involve:

• Hypoxia theory: Areas of tendon with reduced blood supply (particularly at the watershed zone 2–6cm above the insertion) undergo fibrocartilaginous metaplasia — the cells change type and produce calcium as a byproduct
• Cell-mediated calcification: Tenocytes (tendon cells) may actively initiate mineralization under stress conditions
• Mechanical stress: Repetitive microtrauma at the Achilles insertion triggers degenerative and reparative processes that favor calcium deposition
• Enthesopathy: Inflammatory conditions affecting ligament and tendon insertions (seronegative spondyloarthropathies) are associated with entheseal calcification

Symptoms

• Chronic heel pain at the back of the heel or above it — often described as a deep, gnawing ache
• Pain worse with the first steps in the morning and after prolonged rest
• Pain with activity — particularly walking uphill, running, or climbing stairs
• A palpable hard lump at the Achilles insertion or within the tendon body
• Tenderness directly over the calcification
• Occasionally, an acute flare of severe pain (calcium migration)

Diagnosis

Plain X-ray often shows calcification at or near the Achilles insertion — though the appearance varies from small flecks to large dense deposits. Ultrasound demonstrates the calcium deposit within the tendon in real-time and allows assessment of tendon integrity and neovascularization. MRI provides the most comprehensive picture of tendon pathology, bone involvement, and surrounding structures.

Treatment Options

Conservative (First 3–6 Months)

• Activity modification: reduce high-impact activities that load the Achilles
• Heel lifts: reduce Achilles tension and pressure on the insertion
• Ice and NSAIDs: manage acute inflammation
• Physical therapy: eccentric Achilles strengthening (with modifications for insertional involvement), soleus stretching
• Night splints: maintain dorsiflexion during sleep

Extracorporeal Shockwave Therapy (ESWT)

Shockwave therapy is the leading evidence-based non-surgical treatment for calcific Achilles tendinopathy. High-energy focused shockwaves are directed at the calcification, disrupting the calcium deposit and stimulating neovascularization and healing. Success rates of 50–70% calcium resorption at 12 months, with significant pain relief in the majority of treated patients. 3–5 sessions typically performed 1 week apart. Some patients experience a temporary pain increase after treatment as calcification fragments mobilize.

Ultrasound-Guided Needling and Lavage

Under real-time ultrasound guidance, a needle is inserted into the calcium deposit and lavaged (flushed) with saline to mechanically break up and remove the calcium. Highly effective for large, dense deposits. Can be combined with a corticosteroid injection to manage post-procedure inflammation.

Surgical Removal

Reserved for cases that have failed 12+ months of conservative and minimally invasive treatment. The calcium deposit is excised through a posterior incision. If the Achilles is significantly involved or detached during calcium removal, tendon repair or augmentation may be required. Recovery: 6–12 weeks non-weight-bearing followed by progressive rehabilitation.

What About Calcium Deposits That Are Found Incidentally?

Achilles calcification found on X-ray in an asymptomatic patient doesn’t require treatment. Many people have radiographic calcification without meaningful symptoms. Treatment is indicated when the patient has pain — not when the X-ray shows calcium.

The Importance of Addressing Contributing Factors

Calcific tendinopathy often occurs alongside Haglund’s deformity (bony prominence on the back of the heel) or in the context of inflammatory arthritis. Treatment is more effective when these co-conditions are addressed — your podiatrist will evaluate the complete clinical picture before recommending treatment. Contact Balance Foot & Ankle for a comprehensive heel pain evaluation if Achilles calcification is suspected.

Foot or Ankle Pain? We Can Help.

Balance Foot & Ankle — Howell & Bloomfield Township, MI

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When to See a Podiatrist for Achilles Tendon Problems

Calcium deposits in the Achilles tendon (insertional calcific tendinopathy) cause chronic heel pain at the back of the ankle. Dr. Tom Biernacki at Balance Foot & Ankle offers both conservative and surgical treatment options for calcified Achilles tendon conditions.

Learn About Our Achilles Tendon Treatment | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Maffulli N, et al. “Insertional Achilles tendinopathy.” Foot and Ankle Clinics. 2005;10(1):107-119.
2. Irwin TA. “Current concepts review: insertional Achilles tendinopathy.” Foot and Ankle International. 2010;31(10):933-939.
3. McGarvey WC, et al. “Insertional Achilles tendinosis: surgical treatment through a central tendon splitting approach.” Foot and Ankle International. 2002;23(1):19-25.

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Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.