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Achilles Tendinopathy: Why It Won't Go Away (And What Actually Works)
Achilles tendinopathy can be a downright frustrating condition. It often starts as a bit of stiffness in the morning or a niggle during a run, but before long it can stop you doing the things you love. The internet is full of stretches, massage guns, heel drops and miracle cures. Some of these can help, but only if they're used at the right time and for the right type of problem.
To properly treat your Achilles tendon, you need to understand what's happening inside it. Once you understand that, recovery becomes much more straightforward.
The Achilles tendon is the largest tendon in the body. It connects your calf muscles to your heel bone and is responsible for absorbing and releasing huge amounts of force every time you walk, run, jump or change direction.
When the tendon becomes overloaded, it doesn't heal like a muscle strain or a broken bone. Instead, it goes through a process known as the tendon continuum. Tiny proteins called proteoglycans accumulate within the tendon, causing swelling and reducing its ability to tolerate load. The more overloaded the tendon becomes, the less load it can tolerate, creating a frustrating cycle of pain and dysfunction.
How long you've had symptoms can give some indication of how quickly you'll recover. If the condition is relatively new, recovery can happen quite quickly. If it's been present for months, you'll likely need a more structured and progressive rehabilitation plan with the help of a good physiotherapist.
THE THREE PHASES OF ACHILLES TENDINOPATHY
Tendon problems are generally classified into three stages.
1. Reactive Tendinopathy
This is the earliest stage and is often the most painful. It typically develops after a sudden increase in load such as starting a running program, increasing hill training, returning to sport after a break or a particularly demanding event.
The tendon becomes swollen and irritated, resulting in pain and stiffness. This phase usually lasts for the first few weeks.
The good news is that this stage is highly reversible. The key is reducing tendon load while keeping it moving. Complete rest is rarely necessary, but pushing through pain is usually a poor idea.
2. Tendon Dysrepair
If the overload continues, the tendon moves into a dysrepair stage. The swelling within the tendon begins to affect its structure and loading capacity.
This stage often lasts from one to six months.
The tendon is no longer repairing itself effectively and requires carefully controlled loading to restore its strength and capacity. The encouraging news is that this stage still has substantial potential for recovery, but it often requires patience and consistency.
3. Degenerative Tendinopathy
This stage generally develops after symptoms have persisted for more than six months.
Areas within the tendon begin to show structural degeneration, and the tendon becomes significantly less capable of handling load. Interestingly, degenerative tendons are not always painful. Some people have significant tendon degeneration on imaging and very little pain, while others experience substantial symptoms.
If your condition has reached this stage, imaging such as ultrasound can be useful to assess the tendon. Recovery is still very achievable, but you'll likely benefit from a coordinated healthcare team and a structured rehabilitation program.
At this point, if you're feeling confused, that's completely understandable. The rest is easy. There are four main things you need to keep in mind.
1. MANAGE YOUR LOAD
This is the most important part of recovery.
If your treatment has consisted entirely of massage, dry needling, ultrasound, shockwave or other passive modalities without discussing load management, you're missing the most important piece of the puzzle.
The Achilles tendon responds to load. Too much load and it becomes irritated. Too little load and it loses capacity.
A simple strategy is to track your activity and monitor your symptoms the next morning.
Your tendon's response the following morning is more important than how it feels while you're exercising. Mild discomfort during activity is often acceptable, but worsening morning pain and stiffness usually means you've exceeded the tendon's capacity.
Running volume, step count, hill walking and sporting activities all contribute to tendon load. Find the amount your tendon can tolerate consistently and then increase gradually, usually by around 10% per week.
A good physiotherapist can help determine exactly how much load is appropriate for your current stage of recovery.
2. DIFFERENTIAL DIAGNOSIS: ARE YOU SURE IT'S THE ACHILLES?
One of the biggest mistakes people make is assuming every pain at the back of the ankle is Achilles tendinopathy.
Several conditions can closely mimic Achilles symptoms:
Posterior Ankle Impingement
This often produces pain at the back of the ankle when pointing the foot downwards, such as during sprinting, jumping or pushing off during running. Dancers and footballers commonly experience this problem.
Sural Nerve Entrapment
The sural nerve runs along the outside of the Achilles tendon. When irritated, it can create burning pain, tingling, numbness or unusual sensitivity around the outer heel and ankle.
Tibialis Posterior Tendinopathy
This tendon runs behind the inside of the ankle and helps support the arch of the foot. Pain can sometimes refer into the heel region and be mistaken for Achilles problems, particularly in runners.
If you're not improving despite doing all the right things, it's worth having the diagnosis reviewed by a healthcare professional.
3. STRENGTHEN THE TENDON PROPERLY
The Achilles tendon loves load, but it needs the right load at the right time.
One of the biggest mistakes people make is stretching constantly without actually rebuilding tendon capacity.
A successful rehabilitation program usually progresses through several stages:
Stage 1: Isometric Strength Training
These are static calf contractions where the muscle produces force without movement.
Isometric exercises can provide significant pain relief while maintaining strength. They are often useful in the reactive stage when the tendon is particularly sensitive.
Stage 2: Heavy Slow Resistance Training
Once symptoms settle, the focus shifts towards rebuilding tendon capacity.
Heavy calf raises performed slowly and progressively are one of the most effective ways of increasing tendon strength. This usually involves both straight-leg and bent-knee calf raises to target different components of the calf complex. If the tendinopathy is at the insertion, these are done to the ground whereas if it's mid substance (middle of the tendon), they're done off a step. You should try load your leg up as much as you can tolerate. A good trick is to have a backpack full of books (start with around 10kg) and then add more weight each week.
An often overlooked part of Achilles rehabilitation is strengthening the muscles around the tendon. The small muscles inside the foot, known as the foot intrinsic muscles, help support the arch and improve force distribution through the foot. When these muscles are weak, the Achilles tendon can end up absorbing more load than it should during walking and running. Check the video below for a good way to strengthen the foot.
Likewise, the hip extensors, particularly the gluteus maximus, play a major role in controlling how force is transferred through the lower limb. Strong hips help generate power and reduce excessive demand on the calf-Achilles complex during activities such as running, climbing hills and accelerating. This may involve adding exercises such as bridges, step ups and walking lunges to your program while you improve tendon capacity.
So, a comprehensive Achilles rehabilitation programme should include foot strengthening and hip strengthening alongside direct tendon loading.
You should expect this phase to take several months rather than several weeks.
Stage 3: Plyometric Training
Before returning to sport, the tendon must learn to store and release energy again.
Running, jumping, hopping, acceleration and change-of-direction activities place enormous forces through the Achilles tendon. If you skip this stage and go straight back to sport, recurrence rates are high.
Plyometric training bridges the gap between strength work and sporting performance.
Stage 4: Return to Sport
A tendon is not ready for sport simply because it is no longer painful.
Before returning to full activity, it should demonstrate adequate strength, endurance, power and tolerance to sport-specific loads.
This progression is one of the most important reasons many Achilles injuries become chronic. People stop their exercises as soon as the pain decreases instead of fully restoring tendon capacity.
4. IT'S PROBABLY NOT JUST YOUR ACHILLES
The Achilles tendon rarely becomes overloaded in isolation.
More often than not there are contributing factors elsewhere in the body:
Reduced calf strength
Weak foot intrinsic muscles
Hip extensor weakness (particularly gluteus maximus)
Hip abductor weakness
Limited ankle mobility
Poor running mechanics
Sudden training changes
Inappropriate footwear
Previous lower limb injuries
Weak foot muscles can reduce the foot's ability to absorb force efficiently, while weakness through the hips can increase the demand placed on the calf and Achilles during walking, running and jumping. Improving the strength of the foot intrinsics and hip extensors can often reduce the load on the tendon and improve long-term outcomes.
A strong foot acts like a spring and a stable platform. A strong hip acts like an engine. If either of these are underperforming, the Achilles tendon is often forced to work harder than it should.
I can't stress this enough. If you're only treating the sore spot itself, your chances of long-term success are much lower.
The body functions as one connected system, and your Achilles is often the final victim of problems that started elsewhere.
WHERE TO NOW?
In my years of practice, there are a few key takeaways that consistently help people recover from Achilles tendinopathy:
Focus on active management rather than passive treatment.
Manage your load and judge progress based on your pain and stiffness the following morning.
Start with isometric loading, progress to heavy slow resistance training and finish with plyometric training before returning to sport.
Strengthen not only the tendon itself, but also the foot intrinsic muscles and hip extensors.
Don't rush the process. Tendons adapt slowly.
Make sure the diagnosis is correct and consider other causes such as posterior ankle impingement, sural nerve irritation or tibialis posterior tendinopathy.
Address contributing factors throughout the kinetic chain, including strength, mobility and running mechanics.
If your symptoms have been present for more than six months, consider imaging and involving a healthcare team.
Most importantly, have a clear plan and stick with it. Tendons reward consistency, not intensity.
You might need the help of a physiotherapist to guide the progression from pain relief through to a successful return to sport.
