Overview
what it is and why it mattersYour Achilles is the rope-like tendon at the back of your ankle, the largest and strongest tendon in the body, formed by the two big calf muscles (the gastrocnemius and the soleus) merging together and inserting onto the back of your heel bone (the calcaneus). When you push off the ground to walk, run, or jump, that tendon is doing the work.
An Achilles rupture is when the tendon snaps clean through. It almost always happens in the same spot, a few centimeters above where the tendon meets the heel, because that part of the tendon has the poorest blood supply. The usual cause is a sudden, forceful push-off: starting a sprint, jumping for a rebound, lunging in tennis, sometimes just stepping awkwardly off a curb. Most patients describe a sharp, audible pop and the unmistakable feeling of being kicked or shot in the back of the leg, often turning around expecting to find someone behind them. Walking flat is then possible but pushing off the toe is not.
The classic patient is a deconditioned man in his 30s, 40s, or 50s returning to a sport after a layoff, the so-called weekend warrior. Two specific risk factors stand out: prior steroid injections directly into the tendon (which is why we don't put cortisone into the Achilles), and a recent course of fluoroquinolone antibiotics like ciprofloxacin or levofloxacin, both of which weaken the tendon's collagen.
Symptoms
how the injury announces itselfThe injury announces itself: a sudden, loud pop and a sharp pain at the back of the leg, mid-calf to just above the heel. Many patients try to keep playing the next point and find they can walk flat-footed but have lost the ability to rise up onto the toes of that foot. Within a few hours the back of the ankle swells and bruises, and a small valley or gap can often be felt above the heel where the two ends of the torn tendon have retracted apart. The pain itself can be surprisingly modest after the first few minutes. It is the loss of push-off, not the pain, that usually drives the trip in.
What is not typical: a slow, gradually worsening ache after running. That picture points to Achilles tendon pain rather than rupture. Rupture is sudden, focal, and dramatic; tendinopathy is gradual, achy, and worst in the morning. Distinguishing the two on the day of injury matters because the treatment paths are completely different.
Diagnosis & Evaluation
the exam, then ultrasound to confirmA focused physical exam of the ankle, along with the gap that can be felt above the heel and your inability to rise up onto the toes of that foot, usually makes the diagnosis on the day you walk in. Ultrasound in clinic confirms the tear and measures the gap between the two torn ends, which helps decide whether you are a good candidate for non-operative treatment. MRI is reserved for complex or partial-tear pictures where the next step isn't obvious.
Non-Surgical Treatment
healing without an operationThe two torn ends can heal back together without an operation, as long as they are held in close contact while they knit. This functional rehabilitation protocol is often the right path for older or lower-demand patients, those without a wide gap on ultrasound, and those who would prefer to avoid the small risks of an operation.
Casting in Plantarflexion
Care starts with a cast that holds the foot pointed downward, which slackens the tendon and brings the two torn ends together so they can knit.
Progressive Boot & Heel Wedges
Over several weeks the cast transitions into a removable boot with built-up heel wedges. The wedges are gradually removed to bring the foot back up to a flat position.
Functional Rehabilitation
With a properly run accelerated functional protocol, functional outcomes at one year are largely equivalent to surgery for the right patient, though re-rupture rates remain somewhat higher without an operation.
When Surgery Is Considered
stitching the ends back togetherSurgical repair stitches the two torn ends of the tendon back together directly. Two approaches exist: an open repair through a small incision behind the ankle (with the surgeon visualizing both ends and tying them together with heavy suture), and a percutaneous repair that uses a much smaller incision with the suture passed through with specialized instruments. Both restore the tendon's length and tension precisely, which matters for athletes, since a tendon that heals even slightly too long loses push-off strength later. Surgery is the preferred path for younger, athletic patients who want the fastest reliable return to sport, and for ruptures with a wide gap that's unlikely to bridge non-operatively. Either way the boot-and-rehab protocol that follows looks broadly similar; the difference is mostly in re-rupture risk and peak push-off strength at one year, both of which favor surgery for the high-demand patient.
If non-operative care is not enough, this procedure can address this condition:
Frequently Asked
questions we hear in clinicHow do I know it’s a rupture and not Achilles tendonitis?
Rupture is sudden, focal, and dramatic: a loud pop, sharp pain at the back of the leg, and losing the ability to rise up onto the toes of that foot. Tendinopathy is gradual, achy, and worst in the morning, a slow, gradually worsening ache after running. Distinguishing the two on the day of injury matters because the treatment paths are completely different.
I can still walk. Could the tendon really be torn?
Yes. Many patients find they can walk flat-footed but have lost the ability to push off the toe, and the pain itself can be surprisingly modest after the first few minutes. It’s the loss of push-off, not the pain, that usually drives the trip in.
Why does the tendon tear where it does?
The rupture almost always happens a few centimeters above where the tendon meets the heel, because that part of the tendon has the worst blood supply.
What raises the risk of a rupture?
Two specific risk factors stand out: prior steroid injections directly into the tendon, which is why we don’t put cortisone into the Achilles, and a recent course of fluoroquinolone antibiotics like ciprofloxacin or levofloxacin. Both weaken the tendon’s collagen. The classic patient is a deconditioned man in his 30s, 40s, or 50s returning to a sport after a layoff.
Do I need an MRI?
MRI is reserved for complex or partial-tear pictures where the next step isn’t obvious. A focused physical exam, the gap that can be felt above the heel, and the inability to rise up onto the toes of that foot make the diagnosis on the day you walk in, and ultrasound in clinic confirms the tear and measures the gap between the two torn ends.
Can a ruptured Achilles heal without surgery?
It can. The two torn ends can heal back together without an operation as long as they are held in close contact while they knit. That path is often the right one for older or lower-demand patients, those without a wide gap on ultrasound, and those who would prefer to avoid the small risks of an operation. With a properly run accelerated functional protocol, re-rupture rates are essentially equivalent to surgery for the right patient.
When is surgery the better choice?
Surgery is the preferred path for younger, athletic patients who want the fastest reliable return to sport, and for ruptures with a wide gap that’s unlikely to bridge non-operatively. Repair restores the tendon’s length and tension precisely, which matters for athletes, and the differences in re-rupture risk and peak push-off strength at one year both favor surgery for the high-demand patient.
Providers Who Treat Achilles Ruptures
Further Reading
authoritative sourcesExternal patient-education references and related OSI pages for additional background: