M71.062 Abscess of bursa, left knee

Name of the Condition

• Abscess of bursa, left knee

Summary

An abscess of the bursa, left knee is a localized collection of pus within the bursa of the left knee, a small fluid-filled sac that reduces friction between tissues. This condition typically causes pain, swelling, and warmth at the affected site. The left knee-specific designation indicates the abscess is localized to the bursa in the left knee region.

Causes

Abscesses of the left knee bursa usually result from bacterial infection, often introduced through direct trauma, skin breakdown, or spread from adjacent tissues. Staphylococcus aureus is a common causative organism. Non-infectious causes, such as foreign body reaction or sterile inflammation, are less frequent.

Risk Factors

• Recent injury or surgery near the left knee bursa
• Skin infections or open wounds in the left knee area
• Immunocompromised states (e.g., diabetes, HIV)
• Chronic inflammatory conditions (e.g., rheumatoid arthritis)
• Repetitive motion or pressure on the left knee bursa

Symptoms

• Localized pain, tenderness, or throbbing in the left knee
• Swelling, redness, or warmth over the bursa
• Limited range of motion in the left knee joint
• Possible fever or systemic signs if infection spreads
• Pus drainage if the abscess ruptures

Diagnosis

Diagnosis involves a physical examination to assess bursal swelling, warmth, and tenderness. Imaging (e.g., ultrasound) may confirm fluid collection. Aspiration of the bursa may be performed to identify the causative organism and guide treatment.

Treatment Options

Treatment typically includes antibiotic therapy for bacterial infections, often targeted at Staphylococcus aureus. Drainage of the abscess may be necessary for larger or persistent collections. Rest, elevation, and pain management are also recommended. Surgical intervention is considered for refractory cases.

Prognosis and Follow-Up

With appropriate treatment, most cases resolve without long-term complications. Follow-up may involve monitoring for recurrence or residual symptoms. Chronic or untreated abscesses can lead to persistent pain or functional impairment.

Complications

Potential complications include spread of infection to surrounding tissues, sepsis, or chronic bursitis. Delayed treatment may result in joint damage or persistent pain.

Lifestyle & Prevention

• Avoid repetitive pressure or trauma to the left knee
• Maintain good skin hygiene to prevent infections
• Manage underlying conditions (e.g., diabetes) to reduce infection risk
• Use protective gear during activities that stress the knee

When to Seek Professional Help

Seek medical attention if symptoms worsen, fever develops, or pus drainage occurs. Prompt evaluation is necessary for persistent pain, swelling, or limited mobility in the left knee.

Tips for Medical Coders

Document the specific location (left knee) and confirm the diagnosis of bursal abscess. Ensure clinical documentation supports the site and nature of the condition to justify the code M71.062. Note any associated infections or procedures for accurate coding.