M71.162 Other infective bursitis, left knee

Name of the Condition

• Other infective bursitis, left knee

Summary

Other infective bursitis, left knee refers to an infection of the bursa in the left knee region that is not classified under more specific infective bursitis codes. This condition involves microbial invasion of the bursa, leading to inflammation, pain, and potential functional impairment of the left knee joint.

Causes

Other infective bursitis, left knee typically results from bacterial infection, often introduced through direct trauma, skin breakdown, or spread from adjacent tissues. Common causative organisms include Staphylococcus aureus. Non-bacterial infections or secondary infection of a pre-existing bursitis may also occur, though the exact etiology varies by case.

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, swelling, and warmth over the left knee bursa
• Redness or erythema at the site
• Fever or systemic signs of infection
• Limited range of motion in the left knee joint
• Pus drainage if the infection progresses

Diagnosis

Diagnosis involves a physical examination to assess bursal characteristics, including tenderness, warmth, and swelling. Imaging studies or aspiration of the bursa may be performed to confirm infection and identify causative organisms. Clinical documentation must specify the left knee as the affected site.

Treatment Options

Treatment typically includes antibiotic therapy targeted at the identified pathogen, often initiated empirically before culture results. Drainage of the infected bursa may be necessary in severe cases. Rest, elevation, and anti-inflammatory measures can help manage symptoms. Surgical intervention is rare but may be required for persistent or complicated infections.

Prognosis and Follow-Up

With appropriate treatment, most cases resolve without long-term complications. Follow-up care ensures infection resolution and monitors for recurrence. Chronic or untreated infections may lead to persistent pain or functional limitations. Regular assessments help adjust treatment plans as needed.

Complications

Potential complications include abscess formation, spread of infection to surrounding tissues, or chronic bursitis. In severe cases, sepsis or joint involvement may occur. Early intervention reduces the risk of these outcomes.

Lifestyle & Prevention

Avoiding trauma to the left knee, maintaining skin integrity, and managing underlying conditions (e.g., diabetes) can reduce risk. Proper wound care and prompt treatment of skin infections near the knee may prevent bursal infection. Ergonomic adjustments for repetitive knee stress may also be beneficial.

When to Seek Professional Help

Seek care if symptoms worsen, persist despite home care, or include fever, increasing pain, or pus drainage. Immediate evaluation is necessary for signs of systemic infection or if the knee becomes severely swollen or immobile.

Tips for Medical Coders

Document the left knee as the specific site in clinical records to support this code. Ensure infection is confirmed and the bursa is identified as the affected structure. Differentiate from other bursal conditions (e.g., non-infective bursitis) to avoid miscoding.