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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