Achilles tendinopathy is overload damage to the largest tendon in the body — the cord connecting your calf muscles to your heel bone. In runners it announces itself as stiffness and pain above the heel with the first steps in the morning or at the start of a run, often easing as you warm up, then aching again afterward. That 'warms up, then hurts later' pattern fools runners into training through it — which is exactly how a treatable tendinopathy becomes a degenerated tendon at risk of rupture.
The word matters: tendinopathy, not tendinitis. Research over the last two decades shows the problem in chronic cases is mostly failed healing and disorganized collagen, not active inflammation. That's why anti-inflammatory approaches alone don't fix it — and why progressive loading does.
Two different diseases: mid-portion vs insertional
Mid-portion tendinopathy (about 2-6 cm above the heel)
The most common type. A tender, often thickened, spindle-shaped swelling in the free part of the tendon. Squeezing that segment reproduces the pain. This type responds very well to eccentric loading with the heel dropping below a step.
Insertional tendinopathy (where the tendon meets the heel bone)
Pain directly at the back of the heel, often with a bony bump and pain from shoe counters pressing on it. Frequently involves the small bursa and a prominent heel bone shape (Haglund's). Critically: heel drops BELOW step level often aggravate this type — loading should stay at floor level. This distinction is the most common self-treatment mistake runners make.
The training errors behind most cases
Achilles tendinopathy is almost always a load-management story: a sudden jump in weekly kilometers (more than ~10-20% per week), adding hills or speed work abruptly, switching to lower-drop or minimalist shoes overnight, returning too fast after a break, or stacking runs on hard surfaces with poor calf strength. Age matters too — tendon elasticity drops after 35-40, which is why the classic patient is the returning runner in his 40s.
The fix: eccentric loading (the Alfredson protocol)
The best-evidenced treatment for mid-portion Achilles tendinopathy is eccentric heel drops. Stand on your toes on a step, shift weight onto the injured leg, and lower the heel slowly below step level over 3-4 seconds. Use the healthy leg (or both hands on the rail) to return up — the injured tendon only does the lowering. The classic protocol: 3 sets of 15, both with the knee straight and with the knee slightly bent, twice daily, for 12 weeks. Some pain during the exercise (up to 4-5/10) is acceptable and expected.
For insertional tendinopathy, do the same exercise but only lower to floor level — never below the step. Add a small heel lift in the shoe during the painful months and avoid direct pressure from rigid shoe backs.
What else helps — and what to skip
Helps: cutting running volume (not always stopping completely — many runners can keep easy flat running below pain threshold), calf strengthening beyond the protocol, addressing sudden shoe changes, and patience — tendons remodel over months, not days. Shockwave therapy has reasonable evidence as an add-on for stubborn cases. Skip: complete rest for months (detrains the tendon), and be skeptical of quick-fix injections.
Why cortisone injections into this tendon are dangerous
Corticosteroid injected into or immediately around the Achilles weakens collagen at the exact site that's already degenerated, and is associated with tendon rupture — sometimes weeks after a deceptively pain-free period. Most international guidelines advise against intratendinous cortisone here. If a clinic offers you a quick cortisone shot into the Achilles for tendinopathy, that is a reason to seek a second opinion, not a solution.
Rupture: the warning you don't want to ignore
A degenerated Achilles can fail suddenly — classically during a push-off in football, squash, or a sprint. Patients describe a 'kick in the back of the leg' or an audible pop, followed by weak push-off and inability to stand on tiptoes on that leg. A ruptured Achilles needs specialist assessment within days — early treatment, whether surgical repair or structured functional bracing, gives far better results than delayed diagnosis. Around 1 in 4 ruptures is initially missed as 'a bad sprain.'
When to see a specialist
Book an assessment if: pain has persisted beyond 6-8 weeks despite load management and eccentric work, the tendon is visibly thickened or has a growing nodule, pain now occurs during daily walking (not just running), you felt a sudden pop or can't do a single-leg heel raise, or you've been offered a cortisone injection into the tendon and want an evidence-based alternative.
Runners come to me asking for the injection or the magic machine, and I show them a step and a 12-week calendar instead. Eccentric loading is boring, unglamorous, and it works — the tendon rebuilds under controlled load. The Achilles I operate on are almost always the ones that were rested, injected, and run on again in an endless loop. — Dr. Ahmed Ikram, Consultant Foot & Ankle Surgeon, Bone Art Clinic
Frequently Asked Questions
How do I know if my Achilles pain is serious?
Warning signs: pain during normal daily walking, a visibly thickened tendon or growing nodule, pain persisting beyond 6-8 weeks despite reduced training, or any sudden 'pop' with weak push-off. The last one suggests rupture and needs assessment within days.
Can I keep running with Achilles tendinopathy?
Often yes, in modified form: reduce volume, avoid hills and speed work, stay on flat softer surfaces, and keep pain during and after runs below about 4/10 with no worsening morning stiffness. If pain escalates despite modification, stop and get assessed.
Why shouldn't I get a cortisone injection in my Achilles?
Cortisone injected into or right around the Achilles weakens the already-degenerated collagen and is associated with tendon rupture, sometimes weeks later. International guidelines advise against it. Evidence-based options are progressive eccentric loading, load management, and shockwave for stubborn cases.
How long does the Alfredson eccentric protocol take to work?
The protocol runs 12 weeks: 3 sets of 15 heel drops, straight-knee and bent-knee, twice daily. Many runners feel meaningful improvement by weeks 4-6, but the full remodeling benefit needs the complete 12 weeks — stopping early is the most common reason it 'fails.'
Do I need an MRI or ultrasound for Achilles pain?
Not usually at first — diagnosis is clinical. Ultrasound or MRI (MRI costs EGP 3,000-6,000 in Egypt in 2026) is used when pain doesn't respond to 8-12 weeks of proper loading, when rupture or partial tear is suspected, or before any surgical decision. A specialist consultation costs EGP 700-1,500.