By Dr. Kayla Wright, DPM
A complete rupture may occur during sprinting, jumping, court sports, or a sudden change of direction and can feel as if someone kicked the back of the ankle. Tendinopathy more often builds over days or weeks as the tendon struggles to tolerate repeated load.
Partial Achilles tears are the gray zone: they can resemble an acute flare of tendinopathy and may require imaging to clarify the diagnosis.
Achilles tendinopathy vs. rupture at a glance
| Feature | Achilles tendinopathy | Achilles rupture |
|---|---|---|
| Onset | Usually gradual | Usually sudden |
| Common story | Increasing running/jumping load, stiffness, pain with activity | Push-off, jump, sprint or sudden acceleration followed by pop/snap |
| Pain | Load-related; often stiff after rest | Sudden pain may be intense initially, but pain can later decrease |
| Strength | Reduced by pain but often still functional | Marked loss of plantar-flexion/push-off power |
| Walking | Often possible, though painful | May walk with an abnormal gait but push-off is weak |
| Heel raise | Often painful but possible | Single-leg heel raise may be impossible with complete rupture |
| Evaluation | Clinical; imaging if diagnosis uncertain | Prompt clinical exam; ultrasound/MRI when needed |
What Achilles tendinopathy feels like
Achilles tendinopathy is a load-related tendon disorder. Common features include:
- pain during or after running, jumping, or prolonged walking
- stiffness after rest or first thing in the morning
- tenderness over the tendon
- thickening or swelling
- reduced exercise tolerance
- pain that improves somewhat as the tendon warms up, then returns with higher loads
There are two major locations:
Midportion tendinopathy usually occurs several centimeters above the heel attachment.
Insertional Achilles tendinopathy occurs where the tendon attaches to the back of the heel bone and can be aggravated by shoe pressure and deep ankle dorsiflexion.
Current Achilles guidelines emphasize clinical diagnosis, progressive tendon loading, and individualized management rather than complete rest.
What an Achilles rupture feels like
A classic complete rupture is very different.
Patients often describe:
- a sudden pop or snap
- feeling as if they were struck or kicked from behind
- immediate weakness
- difficulty pushing off the injured foot
- inability to continue sport normally
- swelling and bruising
- a possible gap in the tendon
A critical point: you may still be able to move the ankle or limp after a complete rupture. Other muscles can plantar-flex the foot, so the ability to point the toes does not rule out rupture.
The calf-squeeze test
Clinicians commonly use the Thompson/calf-squeeze test. With the patient lying prone and the foot relaxed, squeezing the calf should normally cause the foot to plantar-flex.
Failure of the foot to move normally raises strong concern for Achilles rupture. A systematic review of clinical tests found the calf-squeeze test had high diagnostic accuracy for rupture.
This is best performed and interpreted clinically. A self-test can be misleading, especially with partial tears or guarding.
Partial tears are harder to distinguish
A partial Achilles tear may produce:
- a sharper onset than typical tendinopathy
- localized tendon pain
- weakness with heel raises
- pain when loading the tendon
- swelling
But the tendon may remain continuous enough that classic rupture tests are not clearly positive.
A 2020 review noted that partial ruptures are often misinterpreted as aggravated Achilles tendinopathy. Ultrasound or MRI may be useful when history and examination do not settle the question.
Does severe pain mean a rupture?
No.
Pain intensity overlaps. An acutely aggravated tendon can hurt severely, while the pain after a complete rupture may become surprisingly modest once the initial event has passed.
The more useful variables are:
- sudden vs. gradual onset
- mechanism
- loss of push-off strength
- heel-raise ability
- clinical tendon continuity tests
When Achilles pain needs prompt evaluation
Seek prompt evaluation when:
- you felt or heard a pop
- the injury happened during explosive push-off
- you suddenly cannot push off normally
- you cannot perform a heel raise that was previously easy
- the ankle feels weak rather than merely painful
- there is a new gap or major swelling in the tendon region
An acute Achilles rupture is time-sensitive enough that “wait two weeks and see” is a poor default strategy.
What happens if it is tendinopathy?
The foundation of Achilles tendinopathy care is usually progressive loading rather than prolonged rest.
The 2024 clinical practice guideline for midportion Achilles tendinopathy supports tendon-loading exercise, tailored to irritability and function. A treatment plan may also address:
- temporary activity modification
- calf strength and endurance
- ankle mobility
- running/jumping progression
- footwear when relevant
- biomechanical contributors
Corticosteroid injection directly into or around the Achilles requires particular caution because steroid exposure is associated with tendon-rupture concern; AAOS advises against cortisone injection for Achilles tendinitis.
What happens if the tendon is ruptured?
Both operative and nonoperative management can produce good outcomes in appropriately selected patients when modern functional rehabilitation is used. The decision depends on:
- age and health
- activity demands
- rupture characteristics
- time since injury
- rerupture vs surgical-complication tradeoffs
- patient goals
The correct first step is diagnosis, not assuming every active adult needs surgery or every rupture can simply be braced.
Learn more about Achilles tendon conditions.
Frequently asked questions
Can Achilles tendinitis suddenly tear?
A degenerative tendon may have altered structure, and tendinopathy can coexist with rupture risk, but many ruptures occur without a previous formal tendinopathy diagnosis. A sudden change in function should be assessed regardless of prior symptoms.
Can you walk with a torn Achilles?
Yes, some people can still walk after a complete rupture, but gait is usually abnormal and push-off is weak. Walking ability does not reliably rule out rupture.
Can an Achilles tear heal without surgery?
Many acute ruptures can be managed nonoperatively using modern functional rehabilitation. Surgery may still be preferred for selected patients. Treatment choice is individualized rather than automatically operative.
Is MRI always needed?
No. Complete ruptures are often diagnosed clinically. Ultrasound is highly accurate in experienced hands and MRI is useful in selected cases, including uncertain or complex injuries.
How do I know if my Achilles pain is insertional?
Insertional pain is concentrated where the tendon attaches to the back of the heel bone. Midportion pain is typically several centimeters higher. Posterior heel pain also has other possible causes, including bursitis and bone prominence.
Achilles injury evaluation in Tempe
If Achilles pain began suddenly or you have lost push-off strength, do not treat it as routine “tendinitis” without an examination. Metro Foot & Ankle evaluates Achilles tendon conditions and sports injuries in Tempe and the East Valley. For a stable injury needing prompt evaluation, request an appointment.
This article is for general educational purposes and does not replace individualized medical advice, diagnosis, or emergency care.
Sources
- Chimenti RL, et al. Achilles Pain, Stiffness, and Muscle Power Deficits: Midportion Achilles Tendinopathy Revision 2024. J Orthop Sports Phys Ther. 2024;54(12):CPG1-CPG32. https://pubmed.ncbi.nlm.nih.gov/39611662/ (opens in a new tab)
- de Vos RJ, van der Vlist AC, Zwerver J, et al. Dutch multidisciplinary guideline on Achilles tendinopathy. British Journal of Sports Medicine. 2021. https://pubmed.ncbi.nlm.nih.gov/34187784/ (opens in a new tab)
- Reiman M, Burgi C, Strube E, et al. The utility of clinical measures for the diagnosis of Achilles tendon injuries: a systematic review with meta-analysis. Journal of Athletic Training. 2014;49(6):820-829. https://pubmed.ncbi.nlm.nih.gov/25243736/ (opens in a new tab)
- Gatz M, Spang C, Alfredson H. Partial Achilles Tendon Rupture—A Neglected Entity: A Narrative Literature Review on Diagnostics and Treatment Options. Journal of Clinical Medicine. 2020. https://pubmed.ncbi.nlm.nih.gov/33096900/ (opens in a new tab)
- Shamrock AG, Dreyer MA, Varacallo M. Achilles Tendon Rupture. StatPearls. Updated 2026. https://pubmed.ncbi.nlm.nih.gov/28613594/ (opens in a new tab)
- American Academy of Orthopaedic Surgeons. Cortisone Shot (Steroid Injection). https://orthoinfo.aaos.org/treatment/cortisone-shot-steroid-injection/ (opens in a new tab)