Baker's Cyst

A Baker's cyst (popliteal cyst) is a fluid-filled swelling that develops behind the knee, in the popliteal fossa. The cyst forms when excess joint fluid (synovial fluid) accumulates and bulges out through a weak spot in the back of the knee joint capsule, creating a visible or palpable lump.

Baker's cysts are typically not a primary condition but rather a sign of an underlying knee problem, such as knee arthritis, meniscal tears, or other conditions that cause increased joint fluid production. The cyst itself may cause symptoms, or it may be asymptomatic and discovered incidentally.

At Mountain Spine & Orthopedics, our knee specialists use comprehensive evaluation including physical examination and imaging to identify the underlying cause of the Baker's cyst and create a treatment plan that addresses both the cyst and the underlying condition.

• A visible or palpable lump behind the knee
• Swelling behind the knee that may extend into the calf
• Stiffness or tightness in the knee, especially when fully bending or straightening
• Pain behind the knee, which may worsen with activity
• In some cases, the cyst may rupture, causing sudden pain and swelling in the calf
• Symptoms related to the underlying knee condition (arthritis, meniscal tear, etc.)
• Difficulty fully bending or straightening the knee

Several factors increase the risk of developing a Baker's cyst:

• Underlying knee conditions, such as knee arthritis or meniscal tears
• Previous knee injuries or trauma
• Knee inflammation from any cause
• Age-related changes in the knee joint
• Certain inflammatory conditions, such as rheumatoid arthritis
• Previous knee surgery that may have altered joint mechanics

Diagnosis begins with a comprehensive physical examination to identify the cyst and assess the underlying knee condition. Our specialists look for a palpable mass behind the knee and evaluate for signs of the underlying cause, such as arthritis or meniscal damage.

We may use ultrasound to visualize the cyst and confirm the diagnosis. MRI review may be ordered to assess the underlying knee condition and evaluate the cyst's size and extent. X-rays may also be used to assess for arthritis or other structural issues.

Non-Surgical Treatment Options

Treatment typically focuses on addressing the underlying knee condition, which often resolves the cyst. This may include physical therapy referrals, anti-inflammatory medications, and activity modification. Ice therapy and elevation may help reduce swelling.

Injection or Interventional Care

For patients with persistent symptoms, corticosteroid injections into the knee joint may help reduce inflammation and fluid production, which can shrink the cyst. In some cases, the cyst itself may be aspirated (drained) under ultrasound guidance, though this is often temporary as the cyst may recur if the underlying condition isn't addressed.

Surgical Treatment Options

When conservative measures fail and the cyst causes significant symptoms, surgical options may be considered. This typically involves addressing the underlying knee condition through minimally invasive procedures like knee arthroscopy to treat meniscal tears or cartilage damage, which often resolves the cyst.

Baker's cyst pain is typically felt behind the knee and may be described as a dull ache or tightness. The pain may worsen with activity, especially activities that require full knee bending or straightening.

Some patients experience a feeling of pressure or fullness behind the knee. If the cyst ruptures, patients may experience sudden, severe pain and swelling in the calf, which can mimic a blood clot (deep vein thrombosis) and requires immediate medical attention. Our comprehensive treatment approach addresses both the cyst and the underlying knee condition, providing lasting relief.

Preventing Baker's cysts primarily involves managing underlying knee conditions:

• Seeking prompt treatment for knee injuries or conditions
• Managing knee arthritis to reduce joint inflammation
• Addressing meniscal tears or other structural problems
• Maintaining knee health through regular exercise and weight management
• Seeking early evaluation from a knee specialist when knee problems develop
• Following treatment recommendations for underlying knee conditions

If you've noticed a lump or swelling behind your knee, schedule a consultation with Mountain Spine & Orthopedics today. Benefit from expert evaluation to identify the cause and determine the best treatment approach. Same-day and next-day appointments are often available.