Ganglion Cyst Rupture: Causes, Symptoms, and Care - Orthopedics

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A ganglion cyst is a fluid-filled sac that typically forms near joints or tendons, often in the wrists or hands, but can also occur in other areas, such as the knee. These cysts are generally benign and may not cause any symptoms, although they can sometimes be painful or restrict movement depending on their size and location.
In your case, it sounds like your child had a ganglion cyst located above the left knee, which was diagnosed by an orthopedic specialist. The sudden disappearance of the cyst after your child fell and landed on the knee could indicate that the cyst ruptured. When a ganglion cyst ruptures, the fluid inside the cyst can leak out into the surrounding tissue, which may lead to swelling and bruising, as you have observed.

The bruise you see is likely a result of the rupture of the ganglion cyst. When the cyst ruptures, the fluid can irritate the surrounding tissues, leading to inflammation and bruising. This is a common response, and the bruise will typically resolve on its own over time. The healing process can take anywhere from a few days to a couple of weeks, depending on the severity of the bruise and the individual’s healing capacity.

Here are some steps you can take to care for your child during this time:
1. Rest: Encourage your child to avoid putting weight on the affected leg to prevent further irritation or injury.

2. Ice: Applying ice packs to the bruised area can help reduce swelling and alleviate pain. Make sure to wrap the ice pack in a cloth to protect the skin, and apply it for 15-20 minutes at a time, several times a day.

3. Elevation: Keeping the leg elevated can help reduce swelling. Prop the leg up on pillows when your child is sitting or lying down.

4. Pain Management: If your child experiences discomfort, over-the-counter pain relievers such as acetaminophen or ibuprofen can be given, following the dosage instructions appropriate for their age and weight.

5. Monitor: Keep an eye on the bruise and the overall condition of your child’s knee. If the bruise worsens, if your child experiences increasing pain, or if there are any signs of infection (such as redness, warmth, or pus), it’s important to consult a healthcare professional.

6. Follow-Up: Since the orthopedic specialist recommended surgery initially, it’s advisable to follow up with them or your pediatrician to discuss the current situation. They may want to reassess the knee to ensure that there are no complications from the rupture or any underlying issues that need to be addressed.

In summary, the bruise is likely a result of the ganglion cyst rupturing, and it should heal on its own with proper care. However, keeping in touch with your healthcare provider is essential to ensure that your child’s knee is healing properly and to determine if any further treatment is necessary.