An involucrum is a layer of new bone growth that forms outside of existing bone.
Detailed Explanation of Involucrum
The term "involucrum" (plural: involucra) specifically refers to this new bone formation around pre-existing bone. It is most commonly associated with certain bone infections.
Involucrum in Osteomyelitis
The primary context where one encounters the term involucrum is in cases of pyogenic osteomyelitis. This is a bacterial infection of the bone. Here's how it relates:
- Dead Bone: In osteomyelitis, parts of the existing bone can die due to the infection. This dead bone is called a sequestrum.
- New Bone Formation: The body attempts to wall off the infection and stabilize the area. To do this, new, living bone is laid down around the dead bone (sequestrum). This layer of new bone is the involucrum.
Identification
The involucrum can be identified through radiographic imaging, such as X-rays. This allows medical professionals to visualize the new bone formation surrounding the affected area.
Summary Table
| Term | Definition | Context | Identification |
|---|---|---|---|
| Involucrum | New bone growth outside existing bone | Primarily in pyogenic osteomyelitis | Radiography (X-rays) |
| Sequestrum | Dead bone within the infected area (surrounded by the involucrum) | Pyogenic osteomyelitis | Radiography |
| Osteomyelitis | Bacterial infection of the bone | Formation of sequestrum and involucrum | Clinical examination and radiography |
