The edges and deep surface of the sequestrum present a serrated or worm-eaten appearance due to the process of erosion by which the dead bone has been separated from the living.
The separation of the sequestrum takes place more rapidly in the spongy bone of the ossifying junction than in the compact bone of the shaft.
In the macerated specimen, the sequestrum appears small in proportion to the large cavity in which it lies.
Tuberculous Disease of Child's Tibia, showing sequestrum in medullary cavity, and increase in girth from excess of new bone.
Healing does not take place until the sequestrum is extruded or removed by operation.
The ankle-joint is ankylosed, and there is a large sequestrum in the calcaneus.
Syphilitic Disease of Skull, showing a sequestrum in process of separation.
The sequestrum is separated from the living bone by a clear zone which corresponds to the layer of granulations lining the cavity in which it lies.
Finally, the sequestrum lies loose in a cavity lined by tuberculous granulation tissue, and is readily identified in a radiogram.
The commonest sequel is the presence of a sequestrum with one or more discharging sinuses; owing to the abundant formation of scar tissue these sinuses have rigid edges which are usually depressed and adherent to the bone.
These procedures may be carried out at the same time as the sequestrumis removed, or after an interval.
Operative interference is indicated if a cold abscess develops, if there is a persistent sinus, or if a sequestrum has formed, a point upon which information is obtained by examination with the X-rays.
This kind of abscess may be of small size, no larger than a pea, or may involve a great portion of the shaft of the bone; in such abscesses no definite sequestrum may ever form.
The sequestrum must be removed, but the bony defect fails to heal, and for months persists as a filthy, discharging cavity, with the constant danger of secondary infection and phlegmon, or erysipelatous inflammation.
If the sequestrum be not quite loose at the time of operation, it should be left in situ, provided there be no intracranial symptoms.
After the operation, the wound cavity is kept open, so that the sequestrum can be removed at a later date after it has separated from the living bone.
If, however, it be situated more deeply, forcible removal should not be attempted until the sequestrum becomes loose, the wound cavity being meanwhile kept as aseptic as possible.
If the sequestrum be not loose we must wait until it is movable.
The discovery of a syphilitic sequestrum always calls for active treatment.
In fact, there is less danger in leaving the sequestrum than in attempting to remove it.
This rarely causes true laryngeal obstruction, excepting in those acute cases where subglottic œdema, abscess, orsequestrum is present.
The anterior ligament of the wrist being now divided, the carpus and metacarpus are to be separated by cutting-pliers, and the carpus extracted by strong sequestrum forceps.
When the sequestrum has been detached entire, it is often passed with difficulty.
According to Brinton, separation of the sequestrum occurs between the eighth and fifteenth in intussuscepted small intestine, and between the fifteenth and twenty-second days in acute cases of ileo-caecal and colic invaginations.
The relative frequency of the association between suppurating cavities and amyloid disease is not greater than long-standing necrosis with an extensive sequestrum is with the same state; but the actual number of the former is greater.
In the mandible the sequestrum becomes surrounded by a sheath of new periosteal bone, so that, even if the greater part of the jaw undergoes necrosis, the arch is reproduced, and after removal of the sequestrum little or no deformity results.
The swelling gradually softens and ulcerates, and a sequestrum may separate and leave a perforation in the palate (Fig.
The separation of a sequestrum is usually slow, taking from two to four months according to the acuteness of the infection and the extent of the necrosis.
In either case the separation of the sequestrum is an exceedingly slow process, and is not accompanied by the formation of new bone.
Time may be saved by separating the sequestrum with the aid of an elevator or sharp spoon, or by chiselling away the dead part till healthy vascular bone is reached.
In some cases a sequestrum is formed, either on the surface or in the interior of a vertebra.
The sequestrum can usually be removed after dividing the mucous membrane and gouging away a portion of the outer aspect of the new sheath.
If a sequestrum is present it must be removed, and the bone scraped with a sharp spoon.
The sequestrum that forms includes, as a rule, only the outer table, but in some cases the whole thickness of the bone undergoes necrosis.
The abscess should be laid open, all tuberculous granulations scraped away, and the sequestrum removed, with the aid of the chisel if it has not already become loose.
Sometimes the new bone--which corresponds to the involucrum of an osteomyelitis--imprisons a sequestrum and prevents its extrusion, in which case one or more sinuses may persist indefinitely.
The sequestrum is slowly thrown off, and when separated is circular like a coin and presents worm-eaten edges.
The condition has been attributed to local causes, such as the interposition of muscle or other soft tissue between the fragments, or to the presence of a separated fragment of bone or of a sequestrum following suppuration.
Exfoliation of the cranium occurred; one small sequestrum was separated, which involved the whole thickness of the bone, and a collection of matter between the dura mater and skull-cap was thereby exposed.
In general bone dies irregularly, so that the sequestrum presents an uneven surface, and its margins are rough and serrated by numerous sharp projections, as seen in the one taken from the tibia, and represented here.
When the sequestrum can be readily moved about, or when, projecting through the external opening, it can be laid hold of by the fingers or forceps, attempts must be made to remove it.
When necrosis has occurred, no interference with the bone is allowable, unless the sequestrum is quite loose, or unless the patient’s health is suffering severely under the discharge and irritation.
The sequestrum ultimately separates, or the ulceration gives way to more healthy action.
An excellent specimen of the sequestrumforceps was found in the house of the physician at Pompeii, and is now in the Museum at Naples (No.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "sequestrum" in a variety of sentences. We hope that you will now be able to make sentences using this word.
