How should an acute Achilles tendon injury be evaluated and managed?

Evaluation and Management of Acute Achilles Tendon Injury

Diagnose acute Achilles tendon rupture clinically using one or more of the following physical examination tests: Thompson test (calf squeeze test), decreased ankle plantar flexion strength, palpable gap in the tendon, or increased passive ankle dorsiflexion. 1

Clinical Diagnosis

The diagnosis of acute Achilles tendon rupture is primarily clinical and does not require imaging in most cases:

• Thompson test (Simonds squeeze test): Squeeze the calf while the patient is prone; absence of plantar flexion indicates rupture 1
• Palpable gap: Direct palpation reveals a defect or loss of normal tendon contour 1
• Decreased plantar flexion strength: Compare to the contralateral side 1
• Increased passive dorsiflexion (Matles test): The injured ankle demonstrates greater dorsiflexion than the uninjured side 1

Imaging (MRI, ultrasound, radiography) is not routinely recommended to confirm the diagnosis when clinical findings are clear, as the evidence for their routine use is inconclusive 1. Reserve imaging for equivocal clinical presentations 2.

Treatment Options

Both Surgical and Nonsurgical Treatment Are Viable Options

Nonsurgical treatment is an option for acute Achilles tendon rupture 1. Studies show no significant difference in pain, time to return to work, or major complications between surgical and nonsurgical management 1. However, surgical repair demonstrates significantly fewer reruptures 1.

Surgical treatment is an option and may be preferred for active patients and athletes 1. Surgical patients showed better functional ability at 2,3, and 6 months and faster return to sports 1. Minor complications (wound-related) occur more frequently with surgery, while nonsurgical treatment avoids these surgical complications 1.

Surgical Technique Selection

Open, limited open, and percutaneous techniques are all acceptable options for surgical repair 1. Key differences include:

• Percutaneous repair: Significantly less wound breakdown, fewer scar adhesions, but more wound puckering and potential sural nerve injury risk 1
• Limited open repair: Faster return to normal walking, stair climbing, and sports; fewer wound infections compared to standard open repair 1
• Open repair: Traditional approach with direct visualization 1

Postoperative Management (If Surgery Chosen)

Early Weight Bearing Protocol

Initiate early postoperative protected weight bearing within 2 weeks of surgery, with dorsiflexion limitation 1. This approach allows quicker return to activities during the first 6 months compared to traditional 6-week non-weight-bearing protocols 1.

• Early weight bearing improves time to return to work, sports, and normal walking 1
• By 12 months, functional outcomes are equivalent regardless of weight-bearing protocol 1
• Critical caveat: Patient compliance is essential; noncompliance increases rerupture risk 1

Mobilization and Bracing

Use a protective device that allows mobilization by 2 to 4 weeks postoperatively 1. All devices should limit dorsiflexion to protect the repair 1.

Physical Therapy

Evidence for specific postoperative physical therapy protocols is weak and inconclusive 1. However, recent evidence supports early controlled mobilization and functional rehabilitation for better outcomes 2, 3.

Return to Activity

Timeline Expectations

• Activities of daily living: No specific evidence-based timeline can be recommended regardless of treatment type 1
• Return to sports: Athletes may return to sports within 3 to 6 months after surgical treatment 1
• Recent expert consensus suggests average return to sports initiation at 24.4 weeks postoperatively 4

Rehabilitation Milestones

Based on expert consensus for surgical repair 4:

• Non-weight bearing: Average 2.3 weeks 4
• Foot positioning: Plantarflexion for first 4 weeks 4
• ROM exercises: Avoid beyond neutral; no stretching or eccentric exercises before 12 weeks 4
• Concentric bilateral heel raises: Begin after 6 weeks 4
• Heel cushions: Use 1/8-1/4 inch lifts in daily shoes after 8 weeks 4

Key Clinical Pitfalls

• Do not rely solely on imaging when clinical examination is diagnostic 1
• Patient compliance is critical with early weight-bearing protocols; noncompliance significantly increases rerupture risk 1
• Avoid premature dorsiflexion in the early postoperative period to prevent repair compromise 1
• Functional rehabilitation protocols (early weight bearing and controlled mobilization) improve outcomes in both surgical and nonsurgical populations 2, 3