Baker's cyst - causes, signs and symptoms, investigation, treatment
A Baker's cyst, also known as a popliteal cyst, is a fluid-filled swelling that develops behind the knee. This cyst occurs when excess synovial fluid, the lubricating fluid inside the knee joint, is forced into a small sac called a bursa at the back of the knee. Here are some key points about Baker's cysts:
Causes:
1. **Knee Injury**: Trauma or injury to the knee can increase the production of synovial fluid, leading to the formation of a cyst.
2. **Arthritis**: Conditions such as osteoarthritis or rheumatoid arthritis can cause inflammation and excess fluid production in the knee joint.
3. **Knee Conditions**: Meniscal tears or other knee conditions that affect the synovial membrane.
Symptoms:
Swelling behind the knee.
A feeling of tightness or stiffness.
Pain in the knee or calf, especially when fully extending or flexing the knee.
Limited range of motion.
Sometimes, the cyst can rupture, leading to sharp pain, swelling, and redness in the calf.
Diagnosis:
**Physical Examination**: A doctor may feel the cyst and check for tenderness and swelling.
**Imaging**: Ultrasound or MRI can help confirm the diagnosis and rule out other conditions.
Treatment:
**Observation**: If the cyst is small and not causing symptoms, it may not require treatment and might resolve on its own.
**Medication**: Nonsteroidal anti-inflammatory drugs (NSAIDs) can help reduce pain and inflammation.
**Aspiration**: A doctor can use a needle to drain the fluid from the cyst.
**Corticosteroid Injections**: To reduce inflammation and pain.
**Physical Therapy**: Exercises to improve knee function and reduce symptoms.
**Surgery**: In rare cases, surgery may be needed to remove the cyst, especially if it is large or persistent.
Prevention:
Managing underlying knee conditions such as arthritis.
Avoiding activities that put excessive strain on the knee.
If you suspect you have a Baker's cyst or are experiencing symptoms, it's important to consult with a healthcare professional for a proper diagnosis and treatment plan.