M65.17 Other infective (teno)synovitis, ankle and foot

Name of the Condition

• Other infective (teno)synovitis, ankle and foot
• ICD-10 Code: M65.17

Summary

This condition involves an infection of the synovial sheath surrounding tendons (tenosynovitis) or the synovial membrane of the ankle and foot joints. It typically causes localized inflammation, pain, and functional impairment in the affected area.

Causes

The condition is most commonly caused by bacterial infections, though viral or fungal pathogens may also be involved. It can arise from direct inoculation (e.g., trauma, surgery) or hematogenous spread from a distant infection.

Risk Factors

• Recent ankle or foot injuries (e.g., lacerations, fractures)
• Immunocompromised states (e.g., diabetes, HIV)
• Poor wound hygiene or delayed treatment of minor injuries
• Occupational or recreational exposure to pathogens (e.g., contaminated environments, animal bites)
• Prior ankle or foot surgery or invasive procedures

Symptoms

• Localized swelling, warmth, and tenderness over the affected tendon or joint
• Pain with movement or pressure
• Reduced range of motion or stiffness in the ankle or foot
• Systemic signs (e.g., fever, chills) if infection is severe or widespread
• Possible drainage or pus if the infection is advanced

Diagnosis

Diagnosis involves a physical exam to assess inflammation and mobility. Imaging (e.g., MRI, ultrasound) visualizes soft tissue changes, while laboratory tests (e.g., synovial fluid analysis, cultures) identify infectious agents.

Treatment Options

• Antibiotics are the primary treatment for bacterial infections. Surgical drainage or debridement may be necessary for abscesses or severe cases.
• Immobilization (e.g., splinting) may reduce pain and prevent further damage.
• Physical therapy can aid recovery of mobility and strength once infection is controlled.

Prognosis and Follow-Up

With prompt treatment, most cases resolve without long-term complications. Follow-up may include monitoring for recurrence or residual stiffness. Delayed treatment increases the risk of chronic pain or joint damage.

Complications

• Chronic tenosynovitis or joint stiffness
• Tendon rupture or permanent mobility loss
• Spread of infection to surrounding tissues or bloodstream (sepsis)
• Osteomyelitis (bone infection) if the infection extends to bone

Lifestyle & Prevention

• Clean and promptly treat minor injuries to the ankle or foot.
• Maintain good wound hygiene and avoid contaminated environments.
• Manage underlying conditions (e.g., diabetes) to reduce infection risk.
• Use protective gear during activities with injury risk (e.g., sports, work).

When to Seek Professional Help

Seek care if you experience persistent swelling, pain, or warmth in the ankle/foot, especially with fever or difficulty bearing weight. Prompt evaluation is critical to prevent complications.

Tips for Medical Coders

Document the specific site (ankle and foot) and confirm infective etiology. Include details on infection source (e.g., trauma, surgery) and clinical findings (e.g., swelling, fever) to support code assignment. Ensure differentiation from non-infective tenosynovitis or other joint infections.