What Causes Achilles Tendinopathy, and How Long Does It Take to Heal?
Achilles tendinopathy is caused by repeated overloading of the Achilles tendon, the thick band connecting your calf muscles to your heel bone. Recovery typically takes three to six months of steady rehabilitation. It can take longer if alignment problems elsewhere in the body are adding extra strain. The condition is sometimes called Achilles tendonitis. Tendinopathy is the more accurate term, because it involves tendon degeneration rather than pure inflammation.
Key points
- Achilles tendinopathy is a wear-and-tear problem, not simply inflammation. Tendonitis and tendinopathy refer to the same condition at different stages.
- The main cause is repeated overloading. It is often combined with a sudden increase in training, poor footwear or tight calf muscles.
- Healing usually takes three to six months with the right rehabilitation programme, but timelines vary.
- Problems in your leg alignment, hip or foot posture can quietly overload the tendon. These only show up on standing, weight-bearing imaging.
- EOS standing imaging captures your whole lower limb under load, so your clinician can see alignment issues that lying-down scans may miss.
Your Achilles tendon is the strongest tendon in your body. It connects the gastrocnemius and soleus muscles (the two main calf muscles) to your heel bone. It works every time you walk, run, jump or push off the ground. When the tendon is loaded beyond what it can cope with, the fibres inside start to break down faster than the body can repair them. That is Achilles tendinopathy.
You may see the term "Achilles tendonitis" used to mean the same thing. In the past, clinicians assumed the pain was caused by inflammation. We now know that in most long-standing cases, the tendon shows disorganised collagen and failed remodelling rather than active inflammation. Tendinopathy covers both the early irritated phase and the later degenerative phase. That makes it the more useful word.
What does Achilles tendinopathy feel like?
Achilles pain typically starts as a dull ache or stiffness at the back of the ankle. It is often worst first thing in the morning or after sitting for a long time. It may ease once you start moving, then return after exercise.
When to seek urgent help. If you feel a sudden snap at the back of the ankle, cannot bear weight, or have numbness, weakness, or loss of bladder or bowel control, contact your doctor, call your local emergency number or go to the nearest emergency department straight away. These symptoms need immediate medical attention, not a scan booking.
What causes Achilles tendinopathy?
The root cause is almost always repeated overloading of the tendon beyond what it can currently handle. But what pushes it past that limit varies from person to person.
Your body is a connected chain from feet to head. When your leg alignment is off, the tendon may be taking extra strain even during everyday walking. Understanding how gait is assessed helps explain why the problem can carry on despite rest.
What is the difference between midportion and insertional Achilles tendinopathy?
The two types are defined by where on the tendon the damage occurs. They behave slightly differently and respond to different loading approaches.
Midportion tendinopathy affects the middle section of the tendon, roughly two to six centimetres above the heel. This is the most common type. It is strongly linked to running load and calf tightness.
Insertional Achilles tendinopathy affects the point where the tendon attaches to the heel bone. It is more common in people who are less active, and may involve bony changes where the tendon attaches. It can also be aggravated by shoes that press on the back of the heel.
How long does Achilles tendinopathy take to heal?
Most people see real improvement within three to six months of a structured loading programme. However, some cases take longer. This is especially so if the problem has been there for over a year, or if an underlying alignment issue keeps adding strain.
Tendon remodelling is a slow biological process. Muscle has a rich blood supply. Tendons receive less blood flow, so they heal more slowly. That is why quick fixes rarely work, and why patience with a step-by-step loading plan is essential.
If your Achilles pain keeps coming back despite good rehabilitation, it may be worth looking further up the chain. A subtle rotation in the hip, a small leg-length difference or an altered foot posture can keep overloading the tendon without you realising it.
Achilles pain that keeps going and is not responding to rehab may have a hidden alignment cause. A standing whole-body scan can show what lying-down imaging misses.
Book a free video consultationHow does standing imaging help with Achilles tendinopathy?
Standing, weight-bearing imaging captures your skeleton under real-life load. It shows how your joints, legs and feet actually line up when gravity is at work. Standard lying-down X-rays, CT and MRI relax the muscles and let the joints settle into an unloaded position. This can hide alignment problems that only appear when you are upright.
EOS is a low-dose standing X-ray system that captures your full body, from head to feet, in a single upright image. It uses about 90% less radiation than a standard X-ray, around ten times less. That means your clinician can see your entire weight-bearing chain and spot compensation patterns that may be contributing to your Achilles pain.
For example, if one leg is slightly shorter or one hip sits higher, the foot and ankle on the longer side may overpronate to even things out. That extra inward roll increases the twist on your Achilles tendon. A standard ankle X-ray, taken lying down, would not reveal this. ScanAlign standing imaging at 19 Harley Street, London captures the full picture.
When MRI is the better choice. EOS shows bones, joints and alignment. If your clinician suspects a partial tendon tear, bursitis inside the tendon sheath or other soft-tissue damage, MRI is usually the better tool for that assessment. The two types of imaging work well together.
What helps Achilles tendinopathy recover?
The main part of recovery is a step-by-step tendon-loading programme. It is usually built around exercises such as eccentric heel drops or heavy slow resistance. These exercises stimulate tendon remodelling by slowly increasing the load the tendon can tolerate. Your physiotherapist will guide the details.
Beyond the exercises themselves, several factors affect recovery.
- Load management. Cutting back the activities that bring on your pain, while keeping the tendon loaded enough to adapt.
- Calf flexibility and strength. Addressing tightness in the gastrocnemius and soleus helps spread load more evenly.
- Footwear review. Supportive shoes with a slight heel raise can reduce strain on the tendon during daily life.
- Alignment assessment. If your lower-limb alignment is off, the tendon may keep being overloaded no matter how well you do your exercises. Understanding the full chain, from hip to foot, is part of effective sports injury prevention.
Achilles tendinopathy can also exist alongside other conditions in the same kinetic chain, such as IT band syndrome treatment for pain on the outer side of the knee. When both are present at once, looking at whole-body alignment becomes even more important.
Before you start treatment, or change the one you are on, it is worth getting a detailed diagnosis. Knowing whether the cause sits in the pelvis, the legs or the spine changes what will actually help.
Frequently asked questions about Achilles tendinopathy
They describe the same condition. Tendonitis implies inflammation, which may be present early on. Tendinopathy is now the preferred term, because most long-standing cases involve tendon degeneration rather than active inflammation.
With a steady loading programme, most people improve significantly within three to six months. If the condition has been present for over a year, or there are alignment issues adding to it, it can take longer.
It depends on how severe it is. Many people can keep running at a reduced amount, as long as the pain stays manageable and does not get worse over time. Your physiotherapist can help you find a safe level of activity.
Eccentric heel drops, heavy slow resistance exercises and isometric calf holds are commonly prescribed. The best programme depends on which part of the tendon is affected and your current fitness level. A physiotherapist should tailor the plan to you.
Midportion tendinopathy affects the middle of the tendon, a few centimetres above the heel. Insertional tendinopathy affects the spot where the tendon attaches to the heel bone. They respond to slightly different exercise approaches.
Yes. A leg-length difference, pelvic tilt or foot overpronation can increase the load on one Achilles tendon. These alignment issues only show up clearly on standing, weight-bearing imaging, not on scans taken lying down.
EOS is a low-dose standing X-ray system that captures your whole body in an upright position. It uses about 90% less radiation than a standard X-ray, around ten times less. It shows how your bones and joints line up under your full body weight. This helps clinicians spot compensation patterns that may be contributing to your Achilles problem.
No. ScanAlign accepts self-referrals. You can book an alignment scan directly, starting with a free video consultation.
The price for patients travelling from abroad is confirmed during the free video consultation, and you can find more answers on the ScanAlign FAQs page.
Yes. The EOS system uses about 90% less radiation than a standard X-ray, around ten times less. It is one of the lowest-dose clinical imaging options available for full-body skeletal assessment.
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- Alfredson, H. (2005). The chronic painful Achilles and patellar tendon: research on basic biology and treatment. Scandinavian Journal of Medicine & Science in Sports, 15(4), 252-259.
- NHS. Achilles tendinopathy. NHS inform. Available at: nhsinform.scot.
- Maffulli, N., Khan, K.M., Puddu, G. (1998). Overuse tendon conditions: time to change a confusing terminology. Arthroscopy, 14(8), 840-843.
Written by Abbas Dhami (Specialist Diagnostic Radiographer)
This page is general information and not a diagnosis.
ScanAlign is the trading name of CoreMed Solutions Ltd and operates under The Harley Street Hospital's CQC licence.