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Achilles Tendinopathy – Causes and Treatment

Achilles tendinopathy is a painful overuse condition affecting the Achilles tendon. It is common in physically active individuals and causes pain, stiffness, and swelling near the heel.

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Things worth knowing about "Achilles Tendinopathy"

Achilles tendinopathy is a painful overuse condition affecting the Achilles tendon. It is common in physically active individuals and causes pain, stiffness, and swelling near the heel.

What is Achilles Tendinopathy?

Achilles tendinopathy is a degenerative condition of the Achilles tendon -- the largest and strongest tendon in the human body. It connects the calf muscles (gastrocnemius and soleus) to the heel bone (calcaneus) and is essential for walking, running, and jumping. In tendinopathy, structural changes occur within the tendon tissue, leading to pain, stiffness, and reduced function.

There are two main subtypes: midportion tendinopathy, affecting the middle section of the tendon (approximately 2–6 cm above the heel bone), and insertional tendinopathy, occurring at the point where the tendon attaches to the heel bone.

Causes and Risk Factors

Achilles tendinopathy typically develops as a result of mechanical overload combined with impaired tissue recovery. Common causes and risk factors include:

Excessive physical activity, particularly running, ball sports, or jumping disciplines
Sudden increases in training intensity or volume
Inadequate footwear or insufficient cushioning
Foot alignment issues such as overpronation or high arches
Tight calf muscles and restricted ankle mobility
Older age, associated with reduced tendon elasticity
Overweight (elevated body mass index)
Systemic conditions such as diabetes mellitus, gout, or rheumatic diseases
Use of fluoroquinolone antibiotics, which can impair tendon integrity

Symptoms

The characteristic symptoms of Achilles tendinopathy include:

Pain along the Achilles tendon, especially in the morning or after periods of rest
Stiffness and start-up pain that often improves with gentle movement
Tenderness on palpation of the tendon
Swelling or thickening of the tendon
Pain during activity such as running, climbing stairs, or prolonged walking
In advanced cases: persistent pain even at rest

Diagnosis

Diagnosis is primarily clinical, based on a thorough medical history and physical examination. The clinician evaluates the location of pain, tenderness, and range of motion of the ankle joint.

Imaging studies are used to confirm the diagnosis and assess the extent of tissue changes:

Ultrasound (sonography): First-line imaging to visualize tendon structure, thickening, and partial tears
Magnetic resonance imaging (MRI): Provides detailed information in unclear cases or when a partial rupture is suspected
X-ray: Used to rule out calcifications or bony changes at the tendon insertion

Treatment

Conservative Treatment

The vast majority of patients can be successfully managed with conservative measures. Key treatment strategies include:

Load management: Reduction or temporary modification of aggravating activities
Eccentric exercise training: Targeted calf strengthening and lengthening exercises are considered the gold standard in rehabilitation (e.g., the Alfredson protocol)
Physiotherapy: Manual therapy, stretching, and mobility exercises
Extracorporeal shockwave therapy (ESWT): Use of acoustic waves to stimulate tissue regeneration, especially in chronic cases
Orthotic devices: Heel lifts or insoles to reduce tendon load
Pain management: Short-term use of non-steroidal anti-inflammatory drugs (NSAIDs); corticosteroid injections are used cautiously due to the increased risk of tendon rupture
PRP therapy (Platelet-Rich Plasma): Injection of platelet-rich plasma to promote healing -- evidence remains limited

Surgical Treatment

Surgery is only considered when conservative treatment has failed after at least 3–6 months of consistent rehabilitation. Procedures may include removal of degenerated tissue, release of adhesions, or excision of bony prominences in insertional cases.

Prognosis and Outlook

Achilles tendinopathy is often a chronic condition that requires consistent and patient-centered management. With a structured rehabilitation program -- particularly eccentric training -- most patients experience significant improvement within 3–6 months. Early intervention greatly improves outcomes and helps prevent the condition from becoming long-term.

References

Alfredson H, Lorentzon R. Chronic Achilles tendinosis: recommendations for treatment and prevention. Sports Medicine. 2000;29(2):135–146.
Beyer R et al. Heavy Slow Resistance versus Eccentric Training as Treatment for Achilles Tendinopathy. American Journal of Sports Medicine. 2015;43(7):1704–1711.
Maffulli N, Khan KM, Puddu G. Overuse tendon conditions: time to change a confusing terminology. Arthroscopy. 1998;14(8):840–843.

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