What does a soft (floppy) Achilles tendon after injury indicate and how should it be managed?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: March 15, 2026 • View editorial policy

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.

Ask Question

A Soft Achilles Tendon After Injury Indicates Complete Rupture

A soft or floppy Achilles tendon after injury is a cardinal sign of complete Achilles tendon rupture and should prompt immediate clinical confirmation using the Thompson test, assessment for a palpable gap, and evaluation of decreased plantar flexion strength. 1

Diagnostic Approach

The diagnosis of acute Achilles tendon rupture is primarily clinical and should be established using one or more of the following physical examination findings: 1

  • Thompson test (Simonds squeeze test) – Absence of plantar flexion when squeezing the calf indicates rupture 1
  • Palpable gap or defect – A soft, floppy tendon with loss of normal contour is pathognomonic for complete rupture 1
  • Decreased ankle plantar flexion strength – Marked weakness compared to the contralateral side 1
  • Increased passive ankle dorsiflexion – The Matles test demonstrates excessive dorsiflexion with gentle manipulation 1

Imaging Considerations

  • MRI and ultrasound are NOT routinely required to confirm the diagnosis of acute Achilles tendon rupture when clinical findings are clear 1
  • Imaging may be helpful for preoperative planning or when the diagnosis is uncertain, particularly to assess the size of the gap and quality of remaining tendon 2
  • MRI is the gold standard if imaging is pursued, with approximately 95% sensitivity and specificity 3

Management Decision: Surgical vs. Nonsurgical

Both surgical and nonsurgical treatment are viable options for acute Achilles tendon rupture, with the choice depending on patient activity level, compliance expectations, and risk tolerance. 1, 4

Surgical Treatment

Surgery reduces rerupture rates (2.3% vs. 3.9% nonsurgical) and enables faster return to work (19 days earlier on average), making it preferable for younger, high-demand patients. 4

Surgical Advantages:

  • Lower rerupture risk – Relative risk 0.43 (95% CI 0.31-0.60) compared to nonsurgical management 4
  • Faster return to work and sports – Average return to sports at 24 weeks (6 months) 5
  • Better early functional recovery – 18% greater strength recovery at 18 months 4

Surgical Risks:

  • Wound infection – Open repair carries ~6% risk of superficial infection 5, 4
  • Sural nerve injury – 1.4-2.8% with open repair, higher (3.2-5.2%) with percutaneous techniques 5, 4
  • Deep vein thrombosis – Approximately 1% incidence 5
  • Overall complication rate – Relative risk 2.76 (95% CI 1.84-4.13) compared to nonsurgical 4

Nonsurgical Treatment

Nonsurgical treatment with functional bracing is an acceptable option for patients with lower functional demands or medical comorbidities, provided strict compliance with immobilization protocols can be ensured. 1, 4

Nonsurgical Protocol:

  • Functional bracing is superior to plaster casting – The UKSTAR trial (n=527) demonstrated no significant differences in outcomes between functional bracing and casting 4
  • Higher rerupture risk – 3.9% vs. 2.3% with surgery, primarily related to patient noncompliance 4
  • Comparable long-term functional outcomes – At 2 years, functional deficits persist regardless of treatment method 6

Critical Management Pitfalls

Patient Compliance is Paramount

Noncompliance with postoperative or immobilization protocols is the primary modifiable risk factor for rerupture. 5 Both patients who reruptured in early weight-bearing studies had documented noncompliance and falls during the first 4 weeks. 1

Early Mobilization Protocols

For surgical patients, early protected weight-bearing (≤2 weeks postoperatively) with dorsiflexion restriction accelerates return to activities without increasing rerupture risk. 1, 5 The key is maintaining dorsiflexion protection beyond neutral for the first 4-6 weeks. 5

Chronic Rupture Risk

Delayed diagnosis beyond 4-6 weeks converts an acute rupture to a chronic rupture, which requires more complex reconstruction and has higher infection rates and more prolonged recovery. 2 A soft tendon should therefore prompt urgent evaluation and treatment planning.

Long-Term Expectations

Major functional deficits persist at 2 years regardless of treatment method, with only minor improvements occurring between 1 and 2 years post-injury. 6 Patients should be counseled that physical activity levels often remain reduced compared to pre-injury status, even though patient-reported outcomes may be relatively high (ATRS scores 89-90). 6

References

1
Guideline

diagnosis and treatment of acute achilles tendon rupture.

The Journal of the American Academy of Orthopaedic Surgeons, 2010

2
Research

Management of chronic ruptures of the Achilles tendon.

The Journal of bone and joint surgery. American volume, 2008

3
Guideline

Imaging and Conservative Management of Biceps Tendon Rupture

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2026

4
Research

Achilles Tendon Ruptures: Nonsurgical Versus Surgical Treatment.

Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association, 2025

5
Guideline

Guideline Summary for Open End‑to‑End Repair of Acute Achilles Tendon Rupture

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2026

6
Research

Major functional deficits persist 2 years after acute Achilles tendon rupture.

Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 2011

Related Questions

A 68-year-old white male, 21 days post total hip arthroplasty, has itching at the clean, dry surgical site without drainage; what measures can be taken to resolve or minimize the itching?
In a 79-year-old patient receiving enteral tube feeding who presents with diarrhea, which stool test should be ordered first?
In a 55‑year‑old man with a recent electrocardiogram showing sinus rhythm, a QS complex in V1, poor R‑wave progression in V2, left‑atrial enlargement, and a prolonged QT interval, what is the most likely diagnosis and appropriate treatment?
How do I convert an infusion rate of 60 cc per hour to drops per minute using a microdrip set?
What is the appropriate evaluation and management for an 82‑year‑old male presenting with lower abdominal pain and a burning sensation on urination?
How should a type III odontoid fracture be managed?
What is the recommended management for a type III odontoid fracture with subluxation?
How should a 33‑week pregnant woman with sudden projectile vomiting and inability to retain oral intake be evaluated and managed?
What do my cervical spine MRI without contrast findings (degenerative disc disease with C5‑C6 disc bulge causing spinal canal and neural foraminal stenosis) mean for my hand numbness and carpal tunnel symptoms?
How should I manage a patient with recurrent falls that have not improved despite prior interventions?
What are the target mean arterial pressure (MAP) goals for hypertensive patients receiving a nicardipine infusion?

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.