Knee Pain: Is There Really an Extra Ligament? - Orthopedics

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Is there an extra tendon on the inner side of the knee?


Hello Doctor: I have been experiencing knee pain for a long time.
I had a car accident during middle school, but it wasn't serious, so I didn't pay much attention to it.
However, in recent years, every winter or when the weather changes, I feel significant pain in my knee after walking for a while or going up and down stairs (I feel weakness when going up and the pain is even worse when going down).
Sometimes, I can't squat at all when the pain occurs.
Last year, the pain became almost continuous; although it gets a bit better with rest, I experience pain without engaging in any intense activities, which made me realize I need to take it seriously.
Today, I went to the orthopedic department at Banqiao General Hospital for an examination.
After an X-ray, the doctor said my bones look good and there are no issues, and it is not degenerative arthritis or osteoporosis.
He mentioned that some patients have a condition where an extra tendon on the inner side of the knee causes this issue, and that it can be resolved by cutting the extra tendon.
However, he said that this condition cannot be seen on an X-ray and requires arthroscopic surgery.
He advised me to think about it.
I asked the doctor what would happen if I ignore it, and he said it would get increasingly painful.
I am hesitant because I found online that some people question how it is possible to develop an extra tendon after an injury.
They argue that frequent injuries would lead to many extra tendons, etc.
Can you give me some advice? Also, if I undergo this type of surgery and it turns out not to be an extra tendon, will the cause of the pain be identifiable? If the surgery is performed and it is discovered that it is not the case, what should be done? Is there a risk of cutting the wrong tendon, which could make the situation worse?

Xiao Zhen, 30~39 year old female. Ask Date: 2010/06/08

Dr. Shi Qiming reply Orthopedics


In the case of knee joint injuries that have not healed over a long period or are unresponsive to medication, a thorough examination should be conducted, such as arthroscopy or MRI.
It is recommended to seek treatment at an orthopedic outpatient clinic.

Reply Date: 2010/06/08

More Info


Knee pain can be a complex issue, especially when it has persisted for an extended period, as you described. Your history of a car accident during middle school, followed by recurrent pain that worsens with activity, suggests that there may be underlying issues that need to be addressed. The fact that your X-rays showed no significant problems like degenerative arthritis or osteoporosis is a positive sign, but it does not rule out other potential causes of your pain.

The mention of an "extra ligament" or an additional structure in the knee is intriguing. In the knee, there are several ligaments, tendons, and other soft tissues that can contribute to pain. One possibility is the presence of an accessory ligament or a plica, which is a fold of synovial tissue that can become irritated and cause pain. However, the idea that an injury would lead to the development of an entirely new ligament is not commonly supported in medical literature. Instead, it is more likely that existing structures are becoming problematic due to overuse, inflammation, or injury.

Your symptoms of pain during stair climbing and difficulty squatting are indicative of potential issues with the knee joint, such as patellofemoral pain syndrome, meniscal tears, or ligamentous instability. The fact that your pain improves with rest suggests that it may be related to overuse or mechanical stress on the knee joint.

Regarding the recommendation for arthroscopy, this is a common procedure used to diagnose and treat various knee conditions. During arthroscopy, a small camera is inserted into the knee joint, allowing the surgeon to visualize the internal structures. If an abnormality such as a plica or other soft tissue issue is found, it can often be addressed during the same procedure. However, it is essential to have a thorough discussion with your orthopedic surgeon about the potential risks and benefits of the surgery, as well as what they expect to find.

If the surgery reveals that there is no extra ligament or identifiable cause for your pain, your surgeon should still be able to provide insight into the condition of your knee and recommend further treatment options. These may include physical therapy, activity modification, or other non-surgical interventions aimed at managing your symptoms.

It is also important to consider that surgery carries inherent risks, including infection, bleeding, and the possibility of not achieving the desired outcome. Therefore, it is crucial to weigh these risks against the potential benefits of alleviating your pain and improving your function.

In summary, while the idea of an "extra ligament" is not widely accepted, your knee pain is real and deserves attention. An arthroscopic evaluation may provide clarity on the underlying issues and help guide your treatment plan. Before proceeding, ensure you have a comprehensive discussion with your orthopedic surgeon to address all your concerns and understand the potential outcomes of the surgery. Additionally, exploring conservative management options, such as physical therapy and lifestyle modifications, may also be beneficial in managing your symptoms.

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