You may be wondering — what on earth is calcification of a tendon? It sounds like something out of a medical textbook, and for many people, it’s not a term they hear until they’re experiencing sharp, nagging pain that just won’t go away.
In simple terms, tendon calcification happens when calcium deposits build up inside a tendon (the thick bands of tissue that connect muscles to bones) often leading to inflammation, stiffness, and surprisingly intense pain, especially during movement. It’s most commonly seen in the shoulder (especially the rotator cuff), but can strike in other joints too, such as the hip, Achilles tendon, or elbow.
Though it can sound alarming, the good news is that this condition is treatable, and in many cases, manageable without surgery. From rest and physiotherapy toadvanced options like cortisone injections, shockwave therapy, and prolotherapy, there are a number of effective ways to reduce pain and restore movement.
What is Tendon Calcification?
Calcific tendinopathy (also called calcifying tendinitis) refers to the accumulation of calcium hydroxyapatite crystals within a tendon. Over time, these deposits can cause inflammation, pain, reduced mobility, and in some cases, significant functional impairment.
While it may sound like a purely degenerative condition, calcification of a tendon can happen for various reasons – and interestingly, in some cases, the body reabsorbs the calcium on its own over time.
Commonly Affected Areas
While any tendon can be affected, the most frequently involved areas include:
- Shoulder (Rotator Cuff) – Especially the supraspinatus tendon
- Achilles Tendon – At the back of the ankle
- Patellar Tendon – Just below the kneecap
- Gluteal Tendons – At the side of the hip
- Elbow – Often associated with “tennis elbow”
Causes of Tendon Calcification
The exact cause of calcific tendinopathy isn’t always clear, but several theories and contributing factors include:
1. Cellular Miscommunication
Some researchers believe the condition begins when tendon cells transform into bone-like cells (a process called metaplasia) — leading to calcium crystal deposits.
2. Reduced Blood Flow
Poor circulation to the tendon tissue can hinder its ability to repair, making it more vulnerable to abnormal changes.
3. Repetitive Strain
Overuse or repetitive microtrauma may trigger an abnormal healing response, leading to calcium build-up.
4. Age and Gender
Most commonly occurs between the ages of 30–50 and is more frequently seen in women.
5. Genetic and Metabolic Factors
Conditions like diabetes, thyroid disorders, and genetic predisposition may play a role in some individuals.
What are the stages of calcific tendonitis?
Calcific tendonitis occurs in three stages, including:
- Pre-calcific: During this beginning phase, movement causes pain and range of motion becomes limited. The area changes at a cellular level.
- Calcific: Calcium is released from cells, forming calcium deposits. After a time, the body begins resorbing the deposits. This stage can cause significant discomfort.
- Post-calcific: During this stage, the deposits are replaced by healthy tissue. Range of motion begins to improve.
Symptoms of Tendon Calcification
Some people with tendon calcification experience no symptoms at all, especially in the early or dormant stages. However, when the deposits become inflamed or start breaking down, symptoms can be quite severe.
Common symptoms include:
- Persistent pain near the affected tendon
- Sudden sharp pain if a deposit ruptures
- Stiffness and reduced range of motion
- Swelling and tenderness
- Weakness in the affected limb
- Pain at night – especially when lying on the affected side (in shoulder cases)
Diagnosis
Diagnosis typically involves a combination of physical assessment and imaging:
- X-rays – The most effective tool for spotting calcium deposits
- Ultrasound – Can detect both the presence of deposits and surrounding inflammation
- MRI – May be used to assess tendon health and rule out other pathologies
A thorough clinical examination is essential to ensure accurate diagnosis and guide appropriate treatment.
Conservative Treatment Options
In many cases, tendon calcification can be managed without the need for advanced procedures. First-line treatment usually includes:
1. Rest and Activity Modification
Avoiding movements that aggravate symptoms can allow inflammation to subside.
2. Anti-inflammatory Medication
NSAIDs (such as ibuprofen) can help reduce pain and inflammation.
3. Physiotherapy
Targeted exercises can help restore range of motion, strengthen the surrounding muscles, and improve blood flow.
4. Ice or Heat Therapy
Depending on the phase of inflammation, cold or warm compresses may be helpful in reducing symptoms.
Advanced Treatment Options
For cases that do not improve with conservative care, or where pain significantly impacts quality of life, several more advanced options are available.
1. Cortisone Injections
A Corticosteroid Injection, guided by ultrasound, can be highly effective in reducing inflammation and providing pain relief – particularly if the surrounding bursa (fluid-filled sac near the tendon) is inflamed.
2. Shockwave Therapy (Extracorporeal Shockwave Therapy – ESWT)
This non-invasive technique uses acoustic waves to break down calcium deposits and stimulate healing in the tendon.
3. Prolotherapy and Prolozone Injections
Prolotherapy and Prolozone Injections aim to stimulate the body’s natural healing response in damaged or chronically irritated tendons. In calcific tendinopathy, these treatments don’t directly dissolve calcium deposits, but they help by reducing inflammation, improving blood flow, and strengthening the surrounding tendon tissue.
Prolotherapy involves injecting a mild irritant (usually dextrose), while Prolozone combines this with medical ozone, which has additional anti-inflammatory and regenerative effects. Over time, this can ease pain, improve mobility, and support the tendon’s ability to repair itself — potentially reducing the stress that contributes to ongoing calcification or dysfunction.
Other options may include ultrasound-guided needling (barbotage) to aspirate calcium deposits, or arthroscopic surgery in more severe cases (though surgery is usually a last resort).
What’s the Outlook?
The prognosis for calcific tendinopathy is generally good, especially with early intervention. Many people find relief with physiotherapy and occasional injections, while others may require more structured, multi-modal treatment plans.
In some cases, the calcium deposits may spontaneously reabsorb over time, particularly after the acute “resorptive” phase, which can be extremely painful but often marks the beginning of natural recovery.
Living with Tendon Calcification
Managing this condition often involves a long-term, holistic approach. Key tips include:
- Staying consistent with rehabilitation exercises
- Avoiding overuse of the affected joint
- Maintaining overall tendon health with good nutrition and hydration
- Seeking expert guidance early to avoid chronic pain or dysfunction
Tendon calcification is a condition that can affect anyone – from active adults to those with more sedentary lifestyles. While it can be painful and disruptive, understanding the underlying causes and available treatments can make a significant difference.
If you’re struggling with ongoing tendon pain that doesn’t seem to improve, it’s worth seeking expert evaluation. At Private Injection Clinics, we offer comprehensive assessments and evidence-based treatments, including cortisone injections and prolotherapy — all tailored to your specific condition. For more information, please take a look at our website.
Private Injection Clinics are based on the coast in Leigh on Sea, and in Colchester, Essex – perfect for patients in Essex, Kent, London, and surrounding areas.
Resources
- https://www.privateinjectionclinics.co.uk/treatments/steroid-injections/
- https://www.privateinjectionclinics.co.uk/treatments/prolotherapy-and-prolozone-injections/
- https://my.clevelandclinic.org/health/diseases/21638-calcific-tendonitis
- https://services.nhslothian.scot/musculoskeletal/wp-content/uploads/sites/63/2025/04/Calcific-Tendinopathy-v2.0-no-images.pdf
- https://www.medicalnewstoday.com/articles/321583#diagnosis
- https://pmc.ncbi.nlm.nih.gov/articles/PMC8010668
- https://www.andrewchambler.com/post/calcific-tendonitis-causes-symptoms-and-treatment-options-what-is-calcific-tendonitis