Thinning of cortical bone

Introduction Osteocortical thinning is common in isolated endogenous chondromas. Isolated endogenous chondroma is a relatively common tumor, mainly found in long tubular bones and short tubular bones on the limbs. As the tumor grows, the bone of the affected bone becomes thinner and swells. This condition is more common in the phalanx, metacarpal or metatarsal. Isolated endogenous chondromas can be converted to chondrosarcoma, but this malignant transformation is more common in chondromas in long tubular bones, while few in short tubular bones have malignant changes. The disease begins in children. As the bone grows, the tumor moves from the dry area to the backbone and continues to grow until the bone matures.

Cause

When the bone occurs, it can cause the expansion of the cortical bone, and the cortical bone will become thinner due to expansion. It is a tumor caused by embryonic ectopic tissue. Common in the center of short tubular bones such as young adults' fingers and toes, it may be a hamartoma that starts from cartilage and is derived from residual hyaline cartilage in the epiphysis. These hyaline cartilage are not ossified in the cartilage.

an examination

Related inspection

Determination of bone mineral density in bones and joints of extremities

Thinning of the cortical bone can be caused by isolated endogenous chondroma. At the beginning of clinical symptoms, the patient does not feel the presence of a tumor. The earliest attention is the damage. After the injury, there is local pain and swelling. X-ray films can show pathological fractures. Of the endogenous chondroma cases reported by Machens, 38.4% were found to have pathological bone fractures, and 11% were accidentally discovered. Some patients can have been swollen for a long time, but no pain, or only slight pain, or intermittent pain.

Differential diagnosis

Differential diagnosis of cortical thinning:

1. Isolated endogenous chondroma: long tubular bone and short tubular bone mainly found on the limb. As the tumor grows, the bone of the affected bone becomes thinner and swells.

2, osteogenesis imperfect: extensive mesenchymal defects, so that collagen fiber maturation is inhibited. In the process of cartilage bone formation, the osteophyte cartilage and cartilage calcification area are normal, but the osteoblasts and bone-like tissues are sparse at the metaphyseal end, and the formed bones are small and slender, arranged in a longitudinal direction, and no trabecular bones are visible. The process of membrane internalization is also affected. The periosteum is thickened but the cortical bone is thin, and the lamellar structure is lacking. The Harvard lumen is enlarged. There are many fat and fibrous tissues in the bone marrow cavity. The bone is shorter than normal and the circumference is thinner. Both ends are swollen and braided.

The material in this site is intended to be of general informational use and is not intended to constitute medical advice, probable diagnosis, or recommended treatments.