Insertional vs Mid-Portion Achilles Tendinopathy: Why Location Changes Everything

Achilles tendon pain isn't one thing. Two people can both have 'Achilles tendonitis' and need completely different treatment — not because their pain is different in severity, but because the location of the problem changes everything.

The distinction I'm talking about is insertional versus mid-portion Achilles tendinopathy. In my experience, this is one of the most consistently missed distinctions in tendon rehab. People end up doing exercises that are brilliant for one type and actively harmful for the other. If you've been doing heel drops for months and your Achilles pain isn't shifting, there's a real chance you've been treating the wrong location.

Let me break this down clearly.

Where Is Your Pain?

The most important thing to establish with Achilles tendinopathy is exactly where on the tendon your pain lives.

Insertional Achilles tendinopathy causes pain right at the back of the heel — at the point where the tendon attaches to the calcaneus (the heel bone). If you press your fingers into the very base of the Achilles, right where it meets the heel, and that reproduces your pain, that's insertional. The pain is typically at or below the back of the shoe line.

Mid-portion Achilles tendinopathy causes pain higher up — typically 2–6 cm above the heel bone, in the body of the tendon. If you run your fingers up the Achilles and find a tender, sometimes thickened spot in the middle of the tendon, that's mid-portion.

"These two conditions share a name and superficially similar symptoms. But their underlying biology, their aggravating factors, and their response to specific exercises are meaningfully different."

Knowing which one you have is the single most important step in getting your treatment right.

What Causes Each Type?

Both types are driven by load — too much, too soon, or the wrong kind. But the nature of the load that provokes each one differs.

Mid-portion tendinopathy is predominantly a tensile load problem. The tendon gets overloaded through repeated stretch-shorten cycles — running, jumping, explosive movements. It's particularly common in runners, particularly those who've recently increased volume, changed surfaces, or returned to training after a break.

Insertional tendinopathy has a more complex loading profile. It's not just tension — it's also compression. The point where the tendon meets the heel bone is vulnerable to being compressed (pinched) when the ankle moves into a position that pushes the tendon into the bone. This happens when the heel drops below neutral — like hanging off the edge of a step — or when the back of a shoe digs into the insertion point.

This compressive component is why insertional tendinopathy is more common in certain populations: older adults whose heel pad has thinned, people with a Haglund's deformity (a bony prominence at the back of the heel), and those who wear stiff or poorly fitting footwear.

Why This Matters for Treatment

Here's where the distinction gets critical — and where a lot of people go wrong.

The most famous Achilles tendinopathy exercise is the Alfredson eccentric heel drop protocol: standing on a step, rising up on both feet, then lowering slowly on one foot, letting the heel drop below the level of the step. This protocol has solid evidence behind it — for mid-portion tendinopathy.

For insertional tendinopathy, dropping the heel below the step compresses the tendon into the calcaneus. That's exactly the kind of load we want to avoid. Done consistently, it can maintain or worsen insertional symptoms even as the patient dutifully performs their three sets of fifteen every day, convinced they're doing the right thing.

How to Manage Each Type

Mid-Portion Achilles Tendinopathy

The mid-portion tendon responds well to progressive tensile loading. A structured programme typically progresses through four phases: isometric holds (for pain management and initial loading), heavy slow resistance through range (calf raises on a flat or on a step once tolerated), energy storage exercises (hopping, skipping, bounding), and return to sport or running.

The Alfredson eccentric protocol and the HEAVY protocol (Beyer et al., 2015) have both been shown to produce meaningful improvements. I tend to use heavy slow resistance as the primary vehicle — it gives more control, is easier to load progressively, and patients tolerate it better.

Insertional Achilles Tendinopathy

The insertional Achilles needs to be loaded, but the loading must avoid compression. That means:

Performing all exercises on a flat surface — never hanging the heel off a step. Considering a small heel raise (5–10 mm in the shoe) in the early phase to reduce the angle at the insertion. Reviewing footwear — the back of the shoe should not dig into the insertion. This is often as simple as cutting a small notch in the heel counter of a shoe, or switching to an open-backed shoe temporarily.

Load progression still follows the same overall framework — isometrics, heavy slow resistance, energy storage — but the execution must protect the insertion from compressive forces throughout.

Insertional tendinopathy is generally slower to respond. In my clinical experience, patients with insertional pathology need to set realistic expectations: meaningful improvement often takes 3–6 months, and complete resolution can take longer, particularly if there's a Haglund's deformity or calcific change at the insertion.

Imaging and Diagnosis

A clinical assessment — pressing along the tendon, assessing range of motion, and testing load tolerance — is usually enough to distinguish the two. Ultrasound or MRI can confirm the location and extent of tendon changes, and imaging is warranted if the diagnosis is uncertain, if there's suspicion of a partial tear, or if symptoms aren't responding as expected.

One thing worth noting: imaging findings don't always correlate with symptoms. A tendon can look quite changed on ultrasound and produce minimal symptoms, or look relatively normal and be very painful. The scan is one piece of information, not the whole picture.

When to Get Help

If you're unsure which type of Achilles tendinopathy you have — or if you've been treating one and not getting results — that's the most important signal to get a proper assessment. Working hard on the wrong approach doesn't just waste time; it can entrench symptoms.

A good clinician can identify the location in about thirty seconds. The assessment should then drive a programme that's tailored to your specific presentation, not a generic 'Achilles exercise' handout that doesn't account for where your pain actually is.

For a full breakdown of the loading principles, see the heel raises guide. If you want to understand how long recovery typically takes, this post covers the honest timelines. And if you're ready to follow a structured programme, you can browse the options at the link below.