Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle
Last reviewed: April 26, 2026
Quick answer: An Achilles tendon rupture is a complete or partial tear of the largest tendon in the body, causing a sudden “pop” and immediate inability to push off the foot. Treatment is either surgical repair or functional rehabilitation in a CAM boot — modern evidence shows equivalent outcomes with either approach when managed correctly. Recovery takes 6–9 months regardless of treatment method.
You’re pushing off to sprint, jump, or simply step up a curb — and then it happens: a sudden, sharp pop behind your heel as if someone kicked you or hit you with a bat. You turn around and no one is there. This is the classic presentation of an Achilles tendon rupture, and in our clinic it ranks among the most life-altering injuries we treat. The Achilles is the strongest tendon in the body; when it fails, the entire propulsive mechanism of the foot is gone.
Achilles Tendon Anatomy
The Achilles tendon is formed by the convergence of the gastrocnemius and soleus muscles and inserts onto the posterior calcaneus (heel bone). It transmits forces up to 7–8× body weight during running — the highest load of any tendon in the body. The critical vascular watershed zone lies 2–6 cm proximal to the calcaneal insertion, where blood supply is poorest. This is where approximately 75–80% of Achilles ruptures occur. The remaining 20–25% are insertional, occurring at the heel bone attachment.
Key takeaway: Achilles ruptures occur most often 2–6 cm above the heel — the poorly vascularized watershed zone. The classic mechanism is sudden eccentric loading: push-off from a crouched position, landing from a jump, or stepping into a hole.
![Flat Feet and Heel Pain Best Running Shoes [Foot Doctor] 2026](https://www.michiganfootdoctors.com/wp-content/cache/flying-press/3ed32f87c2616025cecd0ba7660b78d5.jpg)
Causes and Risk Factors
Achilles ruptures affect approximately 18 per 100,000 people annually, with peak incidence in males aged 30–50 — the “weekend warrior” demographic who remain highly active but have lost tendon elasticity. The classic mechanism is sudden eccentric loading: pushing off from a crouched or dorsiflexed position (basketball, tennis, soccer, racquetball). Risk factors include:
- Prior Achilles tendinopathy — degenerated tendon has 80% lower tensile strength than healthy tendon
- Fluoroquinolone antibiotics — ciprofloxacin, levofloxacin, and similar drugs increase rupture risk by 3–4× through collagen disruption
- Corticosteroid injections — intratendinous injections are contraindicated; peritendinous injections carry risk with repetition
- Male sex and age 30–50 — highest incidence group; testosterone may impair tendon collagen synthesis
- Rapid training load increase — returning to sport after prolonged inactivity without progressive conditioning
- Tight calf muscles / limited ankle dorsiflexion — equinus increases Achilles load during gait
Diagnosing an Achilles Rupture
The diagnosis is clinical in most cases — the history and physical exam are highly reliable. Key findings:
- Thompson test (Simmonds test): Patient lies prone, knee bent. Squeezing the calf should cause the foot to plantarflex. If the foot does not move — positive test — the Achilles is completely ruptured. Sensitivity 96%, specificity 93%.
- Palpable gap: A defect in the Achilles tendon is palpable approximately 2–6 cm above the heel in complete ruptures
- Loss of plantarflexion strength: Patient cannot rise onto toes on the injured leg (single-leg heel raise test)
- Bruising and swelling: Posterior ankle hematoma within 24–48 hours
MRI is not required for diagnosis but is used when the clinical exam is equivocal (e.g., partial rupture vs. complete), when surgical planning requires precise mapping of the gap, or when the rupture is more than 2 weeks old (chronic rupture presents differently). Ultrasound is an excellent bedside tool in experienced hands — we use high-frequency ultrasound in our clinic for real-time dynamic assessment.
Treatment Options: Surgery vs Conservative Care
This is the most contested question in Achilles surgery. The short answer: modern evidence supports equivalent re-rupture rates between surgical and non-surgical treatment when non-surgical management is done with a functional rehabilitation protocol (not a plaster cast). The landmark UKSTAR trial (2020) and Cochrane review demonstrate no significant difference in patient-reported outcomes between groups.
Non-Surgical Treatment (Functional Rehabilitation)
The modern non-surgical protocol uses a CAM (Controlled Ankle Motion) boot with heel wedges to hold the foot in 20–30° of plantarflexion, allowing the ruptured tendon ends to heal in apposition. The heel wedges are progressively removed over 8 weeks, allowing gradual tendon lengthening. This approach requires strict protocol adherence but avoids surgical risks (wound complications, sural nerve injury, deep vein thrombosis from tourniquet).
Surgical Repair
Open Achilles tendon repair reapproximates the tendon ends with non-absorbable sutures. Minimally invasive techniques (PARS — Percutaneous Achilles Repair System) offer equivalent mechanical strength with smaller incisions and lower wound complication rates. Surgery is preferred for: young, high-demand athletes who need reliable return to sport, delayed diagnosis (>4 weeks — non-surgical outcomes worsen significantly with gap), or cases where the tendon ends cannot be maintained in apposition with positioning.
Rehabilitation Timeline
- Weeks 0–2: Non-weight-bearing or protected weight-bearing in boot with heel wedges; DVT prophylaxis considered; ankle pumps and gentle range of motion
- Weeks 2–8: Progressive weight-bearing in boot; heel wedge removal sequence; stationary bike with boot
- Weeks 8–12: Transition to shoe with heel lift; walking protocol; calf stretching begins; pool running
- Months 3–5: Progressive calf strengthening; eccentric heel drops; jogging on flat surface
- Months 5–6: Running progression; sport-specific agility work; single-leg heel raise strength testing
- Months 6–9: Return to sport when single-leg calf raise capacity reaches 90% of contralateral limb
⚠️ Seek immediate evaluation if:
- Sudden pop behind the heel during activity with immediate loss of push-off power
- Inability to stand on tiptoe on the affected leg
- Deep posterior ankle pain after a fall, jump, or sprint
- You have been taking fluoroquinolone antibiotics and notice Achilles pain
- Prior Achilles tendinopathy with sudden increase in pain intensity
Frequently Asked Questions
How long does an Achilles tendon rupture take to heal?
Regardless of surgical or non-surgical treatment, full recovery takes 6–9 months. Return to jogging typically occurs at 3–4 months; return to competitive sport at 6–9 months. Re-rupture risk is highest in the first 3 months.
Is surgery required for Achilles tendon rupture?
Not always. Modern functional rehabilitation protocols achieve equivalent outcomes to surgery for most patients when started promptly. Surgery is preferred for young athletes, delayed presentations (>4 weeks), or cases where conservative management cannot maintain tendon apposition.
Can I walk with a ruptured Achilles tendon?
With a complete rupture, push-off is impossible but some walking is possible with a flat-footed gait. We recommend immediate immobilization in a boot and no weight-bearing until evaluated — delaying proper positioning widens the gap and complicates healing.
What is the re-rupture rate?
With appropriate treatment (surgical or functional rehabilitation), re-rupture rates are 2–5% at 2 years. Non-surgical treatment with inadequate immobilization has historically had higher re-rupture rates (10–15%), which is why functional rehabilitation in a CAM boot has replaced plaster casting.
When can I return to running after Achilles rupture?
Most patients begin progressive jogging at 3–4 months when calf strength is adequate. Return to full running and sport typically occurs at 6–9 months. We use single-leg heel raise limb symmetry index (90% of contralateral side) as the objective return-to-sport criterion.
Sources
- Lantto I, et al. Epidemiology of Achilles tendon ruptures: increasing incidence over a 33-year period. Scand J Med Sci Sports. 2015;25(1):e133-138.
- Myhrvold SB, et al. Non-surgical or surgical treatment of acute Achilles’ tendon rupture (UKSTAR). BMJ. 2020;371:m3670.
- Soroceanu A, et al. Surgical vs non-surgical treatment of Achilles tendon rupture: meta-analysis. J Bone Joint Surg. 2012;94(23):2136-2143.
- Grassi A, et al. Minimally invasive vs open surgery for Achilles tendon rupture. Foot Ankle Surg. 2024;30(2):112-121.
Ready to Get Relief?
Same-day appointments available in Howell & Bloomfield Hills, MI
4.9★ | 1,123 Reviews | 3,000+ Surgeries
Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)
- Hallux Valgus (Bunions): Evaluation and Management (PubMed)
- Bunions (Mayo Clinic)
Related Treatments at Balance Foot & Ankle
Our board-certified podiatrists offer advanced treatments at our Bloomfield Hills and Howell locations.
Recommended Products from Dr. Tom