Knee Bruising and Pain After Car Accident: What You Need to Know - Orthopedics

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Bruising on the knee after a car accident has not improved?


I had a car accident around August, and my knee was injured.
At that time, there were surface abrasions and bruising.
The abrasions healed, but the bruise has turned dark and has not improved since then.
Additionally, my knee is very painful even with slight contact.
There was one instance where my knee suddenly started hurting for no apparent reason.
Could it be that there is a hematoma or something similar inside my knee?

123, 20~29 year old female. Ask Date: 2018/01/05

Dr. Shi Guozheng reply Orthopedics


Knee joint contusions typically result in bruising that resolves in about four weeks.
If there is a larger accumulation of blood, the resolution time may be longer.
Pain may be due to incomplete tissue healing.
Applying heat can be beneficial; however, if there are concerns about other issues, it is advisable to consult a physician for evaluation.

Reply Date: 2018/01/05

More Info


After experiencing a knee injury from a car accident, it's important to understand the potential implications and necessary steps for recovery. Bruising and pain in the knee can be indicative of various underlying issues, especially if the symptoms persist or worsen over time.

Firstly, the fact that you experienced a bruise that has turned black and has not healed can be concerning. Bruising occurs when small blood vessels under the skin break, leading to bleeding in the surrounding tissue. Initially, bruises may appear red or purple, but as they heal, they can change color to blue, green, or yellow. The persistence of your bruise suggests that there may be more than just superficial damage.

The pain you describe, especially with slight contact to the knee, could indicate several possibilities. One common issue is a hematoma, which is a localized collection of blood outside of blood vessels. This can occur if there was significant trauma to the knee, leading to bleeding within the knee joint or surrounding tissues. A hematoma can cause swelling, pain, and limited range of motion.

Another possibility is that you may have sustained a ligament injury, such as a sprain or tear, which can occur during a car accident. Ligaments are tough bands of tissue that connect bones to each other, and injuries to these structures can lead to pain, swelling, and instability in the knee. Additionally, cartilage damage, such as a meniscus tear, could also be a factor, especially if you experience locking or catching sensations in the knee.

Given your symptoms, it is advisable to seek medical attention. A healthcare professional can perform a thorough examination and may recommend imaging studies, such as an X-ray or MRI, to assess the extent of the injury. These tests can help determine if there is any internal bleeding, ligament damage, or other structural issues that need to be addressed.

In the meantime, there are several self-care measures you can take to help manage your symptoms:
1. Rest: Avoid activities that exacerbate the pain, and give your knee time to heal.

2. Ice: Apply ice packs to the affected area for 15-20 minutes every few hours to reduce swelling and numb the pain.

3. Compression: Use an elastic bandage or knee brace to provide support and minimize swelling.

4. Elevation: Keep your knee elevated above the level of your heart to help reduce swelling.

5. Over-the-counter pain relief: Nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen or naproxen, can help alleviate pain and reduce inflammation.

6. Physical therapy: If recommended by your doctor, physical therapy can help strengthen the muscles around the knee and improve flexibility.

In conclusion, while some bruising and pain can be expected after a knee injury, persistent symptoms warrant further investigation. Seeking medical advice is crucial to rule out any serious injuries and to develop an appropriate treatment plan. Early intervention can lead to better outcomes and a quicker return to normal activities. Remember to listen to your body and prioritize your recovery.

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