Prevalence and Incidence of Torticollis
Torticollis: Rare Disease
Torticollis is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Torticollis, or a subtype of Torticollis,
affects less than 200,000 people in the US population.
Torticollis Prevalence: Book Excerpts
Prevalence/Incidence of Torticollis: Online Medical Books
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Torticollis:
Causes and incidence
(Professional Guide to Diseases (Eighth Edition))
Torticollis may be congenital or acquired. The three types of acquired torticollis — acute, spasmodic, and hysterical — have differing causes. The acute form results from muscular damage caused by inflammatory diseases, such as myositis, lymphadenitis, or tuberculosis (TB); from cervical spinal injuries that produce scar tissue contracture; and, less commonly, from tumor or medication. The spasmodic form results from rhythmic muscle spasms caused by an organic central nervous system disorder (probably due to irritation of the nerve root by arthritis or osteomyelitis). Hysterical torticollis is due to a psychogenic inability to control neck muscles.
Acquired torticollis usually develops during the first 10 years of life or between ages 30 and 60. Incidence of congenital (muscular) torticollis is highest in infants after difficult delivery (breech presentation), in firstborn infants, and in girls. Possible causes of congenital torticollis include malposition of the head in utero, prenatal injury, fibroma, interruption of blood supply, or fibrotic rupture of the sternocleidomastoid muscle, with hematoma and scar formation.
» READ BOOK EXCERPT ONLINE »
Source: Professional Guide to Diseases (Eighth Edition), 2005
About prevalence and incidence statistics:
The term 'prevalence' of Torticollis usually refers to the estimated population
of people who are managing Torticollis at any given time.
The term 'incidence' of Torticollis refers to the annual diagnosis rate,
or the number of new cases of Torticollis diagnosed each year.
Hence, these two statistics types can differ:
a short-lived disease like flu can have high annual incidence but low prevalence,
but a life-long disease like diabetes has a low annual incidence but high prevalence.
For more information see about prevalence and incidence statistics.
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