M71.46 Calcium deposit in bursa, knee

Name of the Condition

• Calcium deposit in bursa, knee

Summary

Calcium deposit in bursa, knee refers to the accumulation of calcium salts within a bursa of the knee, a small fluid-filled sac that reduces friction between tissues. This condition may cause localized pain, swelling, or functional impairment, depending on the size and location of the deposit. Bursae in the knee are prone to calcium deposition due to their role in facilitating smooth joint movement and exposure to mechanical stress.

Causes

Calcium deposits in knee bursae typically result from chronic irritation, inflammation, or metabolic imbalances. They may develop secondary to repetitive motion, trauma, or underlying conditions such as hyperparathyroidism. The exact mechanism involves the deposition of calcium phosphate crystals within the bursal tissue, though the trigger varies by case.

Risk Factors

• Repetitive or prolonged pressure on knee bursae (e.g., from kneeling, prolonged squatting)
• Occupational or athletic activities involving repetitive knee use (e.g., running, jumping)
• Metabolic disorders (e.g., hyperparathyroidism, renal disease)
• Pre-existing inflammatory conditions (e.g., rheumatoid arthritis)
• Age-related degenerative changes

Symptoms

• Localized pain or tenderness over the affected knee bursa
• Swelling or palpable lump at the site
• Reduced range of motion in the knee
• Discomfort with movement or pressure
• Possible warmth or redness if inflamed

Diagnosis

Diagnosis typically involves a physical examination to assess pain, swelling, and range of motion. Imaging studies, such as X-rays or ultrasound, may be used to confirm the presence of calcium deposits. Clinical correlation with symptoms and history is essential to rule out other conditions.

Treatment Options

Treatment may include rest, ice, and anti-inflammatory medications to reduce pain and swelling. Physical therapy can help improve mobility and strength. In some cases, aspiration of the bursa or corticosteroid injections may be considered. Surgical intervention is rarely needed unless symptoms persist or functional impairment is severe.

Prognosis and Follow-Up

Prognosis is generally favorable with appropriate management. Most cases resolve with conservative treatment, though recurrence is possible. Follow-up care may involve monitoring symptoms and adjusting treatment as needed. Long-term outcomes depend on the underlying cause and adherence to preventive measures.

Complications

Complications are uncommon but may include chronic pain, persistent swelling, or limited mobility if left untreated. In rare cases, the deposit may calcify further, requiring more invasive intervention.

Lifestyle & Prevention

• Avoid repetitive kneeling or prolonged pressure on the knee
• Use protective padding during activities that stress the knee
• Maintain a healthy weight to reduce joint stress
• Engage in regular low-impact exercise to support joint health
• Address underlying metabolic or inflammatory conditions promptly

When to Seek Professional Help

Seek medical attention if pain is severe, swelling worsens, or mobility is significantly impaired. Prompt evaluation is recommended if symptoms do not improve with rest or over-the-counter treatments, or if there are signs of infection (e.g., fever, redness, warmth).

Tips for Medical Coders

When coding M71.46, ensure the documentation specifies the knee as the site of the calcium deposit in the bursa. Verify that the clinical notes support the diagnosis, including details on location, symptoms, and any imaging or physical exam findings. Accurate coding requires clear anatomical specificity to distinguish this code from other bursal calcium deposit codes.