Knee Injuries: Causes of Inner Knee Bouncing and Discomfort - Orthopedics

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Knee injury


Why does my knee twitch noticeably on the inner back side when I extend my leg? It feels like a tendon is jumping up, located near the bend on the inner side of my knee.
It also feels strange on the inner side when I walk.
I had an injury over a month ago and underwent examinations; the doctor only mentioned that there is swelling.
I have seen several doctors, but the situation remains the same.
Therefore, I would like to ask what possible underlying conditions could be causing this issue?

Yongxian, 20~29 year old female. Ask Date: 2016/04/18

Dr. Shi Guozheng reply Orthopedics


If the muscles feel tighter after an injury and do not improve, it is advisable to see a physician.

Reply Date: 2016/04/18

More Info


Knee injuries can be complex, and the symptoms you're describing—specifically the noticeable bouncing or twitching sensation on the inner side of your knee when extending your leg—can be attributed to several potential causes. Given your history of a fall and the presence of swelling (which your doctors have noted as "water on the knee"), it’s essential to consider various factors that could contribute to your discomfort.


Possible Causes of Inner Knee Bouncing and Discomfort
1. Patellar Tendonitis: This condition, often referred to as "jumper's knee," occurs when the patellar tendon becomes inflamed, typically due to overuse or injury. The bouncing sensation you feel might be related to the tendon’s irritation, especially if the knee is under stress during movement.

2. Meniscus Injury: The meniscus is a C-shaped cartilage that acts as a cushion between your thigh bone and shin bone. An injury to the meniscus can lead to symptoms like swelling, pain, and a sensation of catching or bouncing in the knee. If you experienced a twisting motion during your fall, this could have caused a tear.

3. Ligament Strain or Tear: Injuries to the ligaments surrounding the knee, such as the medial collateral ligament (MCL) or anterior cruciate ligament (ACL), can lead to instability and abnormal movements in the knee joint. If these ligaments are compromised, you might experience unusual sensations or discomfort when moving your knee.

4. Bursitis: Inflammation of the bursae (small fluid-filled sacs that cushion the knee joint) can lead to swelling and discomfort. If the bursa on the inner side of your knee is inflamed, it might contribute to the sensations you are experiencing.

5. Iliotibial Band Syndrome: This condition occurs when the iliotibial band (a ligament that runs along the outside of the thigh) becomes tight or inflamed. While this typically causes pain on the outer side of the knee, it can lead to compensatory movements that may affect the inner knee.

6. Synovial Plica Syndrome: The synovial plica is a fold in the lining of the knee joint that can become irritated or inflamed, especially after an injury. This can lead to sensations of popping or snapping, particularly when bending or straightening the knee.


Recommendations for Management
1. Rest and Ice: Given that you have swelling, it's crucial to rest your knee and apply ice to reduce inflammation. Avoid activities that exacerbate the pain.

2. Physical Therapy: Engaging in physical therapy can help strengthen the muscles around your knee, improve flexibility, and stabilize the joint. A physical therapist can provide targeted exercises to address your specific symptoms.

3. Medication: Over-the-counter nonsteroidal anti-inflammatory drugs (NSAIDs) can help manage pain and inflammation, but if you have allergies to these medications, consult your doctor for alternatives.

4. Follow-Up Imaging: If your symptoms persist, consider discussing further imaging studies, such as an MRI, with your physician. This can help identify any underlying injuries that may not have been visible on initial examinations.

5. Avoid High-Impact Activities: Until you have a clearer understanding of your injury, avoid activities that put excessive strain on your knee, such as running or jumping.

6. Consult a Specialist: If you haven’t already, consider seeing an orthopedic specialist who focuses on knee injuries. They may provide a more comprehensive evaluation and treatment plan.


Conclusion
The sensations you're experiencing in your knee could stem from various underlying issues, particularly following your recent fall. It's essential to address these symptoms proactively to prevent further injury and promote healing. By following the recommendations above and maintaining open communication with your healthcare providers, you can work towards a better understanding of your condition and an effective treatment plan.

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