Ligaments are bands of strong, flexible tissue that connect bones or cartilage, providing stability to joints. Knee ligament injuries can occur when your knee is hit forcefully, you land on it badly, or it sharply changes direction. Symptoms include swelling and pain, reduced movement, a popping sound, a feeling of instability and sometimes bruising.…
- A Baker's cyst is a soft lump at the back of the knee. It is caused by synovial fluid building up inside a bursa.
- A Baker's cyst can be caused by damage to the knee, including injury, infection or arthritis.
- A Baker's cyst does not always require treatment, as the condition often goes away on its own. It is often recommended to wait and watch.
- If treatments are needed, they can include physiotherapy, fluid draining, anti-inflammatory medication, and sometimes surgery.
What is a Baker's cyst?
A Baker's cyst, also known as a popliteal cyst, is an abnormal swelling that shows up as a soft lump at the back of the knee. Injury or disease can cause fluid to build up inside the bursa, a sac that reduces friction at a joint.
The fluid build-up can be painful and reduce movement at the joint.
Signs and symptoms
A Baker's cyst might have no symptoms, but when symptoms do occur they may include:
- A visible lump or swelling at the back of the knee;
- Recurring pain in the knee;
- A feeling of pressure in the back of the knee;
- Reduced joint mobility, and;
- A feeling of tightness in the knee when the leg is straightened.
Causes of Baker's cysts include:
Methods for diagnosis
To diagnose Baker's cyst, your doctor will examine your knee and ask questions about your medical history. They may also shine a light through the cyst to determine if it is fluid-filled. They may also ask for scans such as an X-ray, ultrasound or magnetic resonance imaging (MRI).
Types of treatment
A Baker's cyst does not always require treatment, as the condition often goes away on its own. It is often recommended to wait and watch, especially for children.
If treatment is needed, it can include:
- Physiotherapy: icepacks, crutches and special exercises to maintain and improve movement;
- Draining fluid from the cyst with a needle. However, the cyst can return if there is an underlying condition that remains untreated;
- Cortisone injections to reduce inflammation, and;
- In some cases, surgery is performed to remove the cyst entirely.
Left untreated, complications of a Baker's cyst include:
- Continued growth of the cyst and worsening of symptoms;
- The growth of the cyst extending down the leg, and;
- Bursting of the cyst, which causes sharp pain, swelling and redness in the leg.
Most people respond well to treatment and improve over time.
Although you may not be able to prevent yourself from developing arthritis or getting an infection that causes a Baker's cyst, you can reduce your risk of injury by:
- Taking time to warm up, cool down and stretch before and after sport and exercise;
- Wearing supportive footwear, and;
- Applying icepacks to the swollen area and seeking medical attention if you do hurt yourself.
- Bakers cyst | University of Maryland Medical Center. Accessed 8 October 2014 from https://umm.edu/Health/Medical/Ency/Articles/Bakers-cyst
- Bakers cyst: MedlinePlus Medical Encyclopedia. Accessed 8 October 2014 from http://www.nlm.nih.gov/medlineplus/ency/article/001222.htm
- Popliteal (Bakers) cyst. Accessed 8 October 2014 from http://www.uptodate.com/contents/popliteal-bakers-cyst?source=search_result&search=baker%27s+cyst&selectedTitle=1~25
FAQ Frequently asked questions
What is a Baker's cyst?
A Baker's cyst, also called popliteal cyst, is an abnormal swelling at the back of the knee due to a build-up of synovial fluid within a bursa. A bursa is a fluid-filled sac that reduces friction at a joint.
What causes Baker's cysts?
Baker's cyst is caused by joint fluid build-up in a bursa, or herniation of the synovial membrane through the back of the knee joint capsule. This can happen through: injury, infection, or arthritis (rheumatoid arthritis and osteoarthritis of the knee). for some …
How are Baker's cysts diagnosed?
Baker's cysts are diagnosed by: a physical examination and clinical history - your doctor will examine your knee and ask questions about your medical history; transillumination - the doctor will shine a light through the cyst to determine if it is …
How are Baker's cysts treated?
A Baker's cyst does not always require treatment. In particular, it is not usually recommended for children as the condition often goes away without treatment. Treatments can include: physiotherapy - icepacks, crutches and special exercises to maintain and …