A lump has appeared on the outer side of the knee; it is not red, but there is pain when standing with the knee bent. What could be the cause?
A lump suddenly appeared on the outer side of my knee; it is not red, and I usually don't feel much, but it becomes painful when bending the knee or standing. Now, my walking is somewhat affected. What could be causing this?
Doctor's answer (1)
A lump on the outside of the knee accompanied by pain during knee bending or standing may be caused by several conditions. The following are some common causes:
1. Iliotibial Band Syndrome: This is a common injury among runners and athletes, caused by inflammation of the iliotibial band due to overuse, potentially leading to lateral knee pain and swelling.
2. Meniscus Injury: The meniscus is a cartilage pad located between the thigh bone and the tibia, helping to cushion and stabilize the joint. A sprain or sports injury can cause the meniscus to tear, resulting in pain and a sensation of a lump.
3. Bursitis: There are multiple bursae around the knee that serve to reduce friction between tendons and bones. When these bursae become inflamed, they may form a lump and cause pain.
4. Chondromalacia Patellae: Although primarily affecting the patella, this condition can sometimes involve the surrounding knee area, causing pain and discomfort.
5. Synovial Cyst: This is a common knee joint condition caused by abnormal proliferation of the synovial membrane, forming a cyst. If the cyst is small and asymptomatic, it may not require treatment; however, if the cyst is large or causing significant symptoms, surgical treatment may be considered.
