M76.4 Tibial collateral bursitis [Pellegrini-Stieda]

Name of the Condition

Tibial Collateral Bursitis [Pellegrini-Stieda]

Summary

Tibial collateral bursitis, also known as Pellegrini-Stieda disease, is an inflammatory condition affecting the bursa near the medial collateral ligament (MCL) of the knee. This condition typically causes localized pain and swelling in the medial knee region, often resulting from trauma or overuse. It may be associated with MCL injury or chronic stress to the area.

Causes

Tibial collateral bursitis commonly arises from direct trauma to the medial knee, such as a blow or fall, or from repetitive stress on the MCL. It can also develop secondary to MCL sprains, where inflammation extends to the adjacent bursa. Overuse activities involving knee flexion or valgus stress may contribute to irritation of the bursal tissue.

Risk Factors

• Participation in sports or activities with high knee stress, such as soccer, basketball, or skiing.
• History of knee injuries, particularly MCL sprains or medial meniscal tears.
• Age-related degeneration of the knee joint, reducing tissue resilience.
• Poor biomechanics or muscle imbalances affecting knee alignment.

Symptoms

• Localized pain and tenderness over the medial knee, often worsening with activity.
• Swelling or palpable mass in the medial knee region.
• Stiffness or reduced range of motion, particularly with knee flexion.
• Pain that may radiate along the inner knee or thigh.

Diagnosis

Diagnosis is based on clinical evaluation, including tenderness over the medial collateral ligament and bursa. Imaging, such as ultrasound or MRI, may be used to confirm bursal inflammation and rule out associated injuries like MCL tears or meniscal damage. Patient history of trauma or overuse is also considered.

Treatment Options

• Rest and activity modification to reduce knee stress.
• Ice application and anti-inflammatory medications to manage pain and swelling.
• Physical therapy focusing on strengthening and flexibility of the knee and hip muscles.
• Corticosteroid injections for severe or persistent symptoms.
• Surgical intervention in rare cases of chronic or refractory bursitis.

Prognosis and Follow-Up

Most cases resolve with conservative treatment within weeks to months. Recovery depends on the severity of the condition and adherence to rehabilitation. Follow-up may include periodic assessments to monitor symptoms and adjust treatment. Chronic cases may require ongoing management to prevent recurrence.

Complications

• Chronic pain or persistent swelling if untreated.
• Limited mobility or functional impairment.
• Recurrence due to inadequate rest or reinjury.
• Rarely, progression to MCL instability or joint degeneration.

Lifestyle & Prevention

• Avoid high-impact activities that stress the knee until symptoms resolve.
• Use proper footwear and biomechanics during exercise.
• Incorporate knee-strengthening exercises to improve stability.
• Apply ice and elevate the knee after activity to reduce inflammation.

When to Seek Professional Help

Seek medical attention if pain is severe, persistent, or worsening; if swelling is significant or accompanied by bruising; or if mobility is severely limited. Prompt evaluation is recommended if symptoms do not improve with rest or home care.

Tips for Medical Coders

Document the clinical findings supporting the diagnosis, including location of tenderness, imaging results, and patient history of trauma or overuse. Ensure the code M76.4 is used for tibial collateral bursitis specifically, distinguishing it from other knee bursitis or MCL injuries. Note any associated conditions, such as MCL sprains, as they may require additional coding.