Involucrum

An involucrum (plural involucra) is a layer of new bone growth outside existing bone seen in pyogenic osteomyelitis. It results from the stripping off of the periosteum by the accumulation of pus within the bone, and new bone growing from the periosteum.

It can be seen radiographically (i.e., with x-rays), although it is seen rarely in developed countries, given that osteomyelitis is rarely left untreated there.

See also

Sequestrum

Bone and joint disease (M80–M94, 730–733)

endocrine:	Osteitis fibrosa cystica Brown tumor

infection:	Osteomyelitis Sequestrum Involucrum Sesamoiditis Brodie abscess Periostitis Vertebral osteomyelitis

Bone resorption

Other

Chondritis	Relapsing polychondritis

Other	Tietze's syndrome

Combined

Osteochondritis

Osteochondritis dissecans

leg:	hip Legg–Calvé–Perthes syndrome tibia Osgood-Schlatter disease Blount's disease foot Köhler disease Sever's disease

spine	Scheuermann’s disease

arm:	wrist Kienbock's disease elbow Panner disease

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