Baker's cyst

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Baker's cyst
Synonyms	Popliteal cyst
Pronounce
Specialty	Rheumatology, Orthopedics
Symptoms	Swelling behind the knee, knee pain, stiffness
Complications	Deep vein thrombosis, Compartment syndrome
Onset
Duration
Types
Causes	Osteoarthritis, Rheumatoid arthritis, Meniscus tear
Risks
Diagnosis	Physical examination, Ultrasound, MRI
Differential diagnosis	Deep vein thrombosis, Popliteal artery aneurysm
Prevention
Treatment	Aspiration, Corticosteroid injection, Physical therapy
Medication
Prognosis
Frequency
Deaths

A Baker's cyst, also known as a popliteal cyst, is a fluid-filled swelling that forms at the back of the knee. It is named after the British surgeon who first described it, Dr. William Morrant Baker. A Baker's cyst develops when there is an accumulation of synovial fluid, a lubricating fluid that surrounds the knee joint, causing a bulge in the popliteal fossa (the hollow space at the back of the knee).

Bakers cyst

Causes

• The primary cause of a Baker's cyst is an underlying knee joint condition that leads to increased production of synovial fluid or impaired drainage of the fluid from the joint. Common causes include:
• Osteoarthritis: Degenerative joint disease, such as osteoarthritis, can cause inflammation of the knee joint, leading to excessive synovial fluid production.
• Rheumatoid Arthritis: Inflammatory arthritis, such as rheumatoid arthritis, can also result in increased synovial fluid production and the formation of a Baker's cyst.
• Meniscal Tears: A tear in the meniscus, the cartilage pad between the thighbone and shinbone, can lead to joint inflammation and cyst formation.
• Other Knee Injuries: Any injury or condition that causes inflammation of the knee joint, such as ligament sprains, can contribute to the development of a Baker's cyst.

Symptoms

• The most common symptom of a Baker's cyst is a swelling or lump at the back of the knee. The cyst may be painless initially but can cause discomfort or pain if it grows larger or presses on surrounding structures. Other symptoms may include:
• Stiffness and Limited Range of Motion: The presence of a Baker's cyst can cause stiffness in the knee joint and a decrease in the ability to fully bend or straighten the knee.
• Pain and Swelling: If the cyst ruptures or leaks, it can cause sudden pain, swelling, and redness in the calf area due to the release of synovial fluid into the surrounding tissues.
• Feeling of Tightness or Pressure: Some individuals may experience a sensation of tightness or pressure at the back of the knee due to the presence of the cyst.

Diagnosis and Treatment

• A Baker's cyst is typically diagnosed through a physical examination of the knee. The cyst can often be felt as a distinct bulge in the popliteal fossa. Imaging tests, such as ultrasound or magnetic resonance imaging (MRI), may be ordered to confirm the diagnosis and assess the extent of the cyst.
• Treatment of a Baker's cyst depends on the underlying cause and the severity of symptoms. Conservative measures may include:
• Rest and Activity Modification: Avoiding activities that exacerbate symptoms and resting the knee can help reduce inflammation and cyst size.
• Pain Management: Over-the-counter pain medications or nonsteroidal anti-inflammatory drugs (NSAIDs) may be recommended to relieve pain and inflammation.
• Physical Therapy: Exercises and stretches prescribed by a physical therapist can help improve knee joint mobility and reduce symptoms.
• In some cases, when conservative measures fail to provide relief or if the cyst causes significant pain or restricts movement, more invasive interventions may be considered. These may include:
• Aspiration: Draining the fluid from the cyst using a needle and syringe can provide temporary relief.
• Corticosteroid Injection: Injecting a corticosteroid medication into the cyst can help reduce inflammation and alleviate symptoms.
• Surgery to remove the cyst (cyst excision) is rarely necessary and is reserved for cases where the cyst causes persistent symptoms or when there is an underlying knee joint problem that requires surgical intervention.

Summary

A Baker's cyst is a fluid-filled swelling that develops at the back of the knee due to an underlying knee joint condition. It can cause discomfort, pain, and limited knee joint mobility. Treatment options depend on the severity of symptoms and the underlying cause, and may range from conservative measures to more invasive interventions.

See Also

• Osteoarthritis
• Rheumatoid Arthritis
• Meniscal Tears
• Joint Inflammation

References

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