Bone protrusion on the outside of the child's knee

When a child has a bone protrusion on the outside of his kneecap, it is generally due to the head of the bone and is a normal physiological phenomenon. This symptom will be more obvious when the child is relatively thin. Of course, if the parents are afraid that there are other reasons, they can also take an X-ray for examination. It may also be due to a tumor. The most common one is osteochondroma. At this time, you should see an orthopedic doctor and consider surgical resection.

Chondroma

Chondroma is a common benign bone tumor. Endogyctic (medullary) chondroma refers to a chondroma occurring in the medullary cavity, which is the most common; subperiosteal (near cortical) chondroma is less common. Chondroma combined with multiple hemangiomas is called Maffuci syndrome. Chondromas are more common in single tumors, while multiple tumors are less common. Chondromas are characterized by symmetrical growth and are accompanied by limb malformations, also known as enchondromatosis. Those occurring on one side of the limb are also known as Ollier's disease. Chondromas located in the pelvis, sternum, ribs, long bones of the limbs or vertebrae are prone to malignant transformation; chondromas occurring in the bones of the fingers (toes) rarely become malignant.

examine

X-ray signs of enchondroma: When it occurs in the finger (toe) bones, it is in the central position. Clear-edged and neat cystic transparent shadows can be seen, the affected bone cortex is swollen and thinned, and scattered sand-like dense spots can be seen within the transparent shadows. When the tumor occurs in the metacarpal (metatarsal) bones, the tumor shadow is larger, often located at the bone ends, the bone cortex expands significantly, and there is no periosteal reaction. If the tumor occurs in the long bones of the limbs, the shadow of the tumor is extensive. When the tumor becomes malignant, cortical bone destruction and periosteal reaction may be seen.

Diagnosis of enchondroma:

1. It is more common in young and middle-aged people, and is more common in the central part of the short tubular bones of the hands and feet, mostly in the phalanges and metacarpals, and is often multiple. Pelvis, ribs and long tubular bones are often single. 2. The lesion is locally fusiformly swollen, with mild pain and tenderness, and pathological fractures may occur. Malignant transformation is rare, but when it occurs, the tumor may suddenly increase in size and the pain may intensify. 3. The diagnosis can be confirmed by X-ray and pathological examination.

treat

The treatment principles of enchondroma are as follows: enchondroma of the short bones of the fingers, palms and feet should be completely scraped off and then bone grafted; enchondroma of the long tubular bones is prone to recurrence after scraping and bone grafting, and the tumor segment should be removed and large bone transplanted; when it degenerates into chondrosarcoma, amputation or joint dissection should be performed.