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But back to our topic.
Hair loss is primarily caused by aging, a change in hormones, and a family history of
baldness.
As a rule, the earlier hair loss begins, the more severe the baldness will become.
Hair loss can also be caused by burns, other thermal injuries, trauma, and prior surgeries.
In these cases hair replacement surgery is considered a reconstructive treatment, and
may be covered by some health insurance policies.
If you're considering hair replacement surgery, this web page will give you a basic understanding
of the variety of procedures involved.
It cannot answer all of your questions, since a lot depends on your individual circumstances
What is a hair cycle?
Hair growth goes through a cycle with three identified stages - catagen (transitional
phase), telogen (resting phase), and anagen (growing phase).
Approximately 90% to 95% of hairs are in the anagen phase, and 5% to 10% are in the telogen
phase.
In the scalp, the anagen phase lasts between 2 to 6 years, catagen between 2 to 3 weeks,
and telogen between 2 to 3 months
In the anagen phase, hairs grow at a rate of about 1cm per month which slows with age.
Length of hair corresponds to the amount of time in the anagen phase.
This explains why hair on the head is longer than hair on other parts of the body, such
as the eyebrows which only spend 30-45 days in the anagen phase.
Catagen is the period of transition between the anagen phase and the telogen phase.
Less than 1% of hairs are in this 2-3 week period at any one time.
Changes take place in the structure of the hair follicle and at the end of catagen, telogen
phase is entered.
Telogen phase is the resting phase of the hair follicle.
At the end of the telogen phase, the hair follicles will reenter anagen phase and start
growing again.
Approximately 5-10% of scalp hair is in the telogen phase at any one time and these follicles
are randomly distributed.
It is during telogen hairs that hair is normally shed.
Approximately 25-100 hairs are shed each day.
What causes hair loss?
There are many different causes of hair loss all with different treatments.
We will cover the more common causes below.
The most common cause of hair loss, or alopecia, is often referred to as male patterned baldness.
More appropriately, this condition is termed androgenic alopecia, and can effect women
as well as men.
25% of men aged 25 years have some degree of clinically apparent androgenic alopecia
and over 40% of men will develop androgenic alopecia at some point in their life.
Androgenic alopecia results from progressive shortening of the anagen cycle with resultant
decreased time for hair growth.
Hair loss usually begins with the frontoparietal scalp and then the vertex.
Female-pattern baldness is similar but more diffuse, without complete baldness and maintaining
the anterior hairline.
Fortunately hairs on the sides and back of the scalp are androgen-independent and thus
do not suffer from androgenic alopecia - it is these hairs which are used for hair transplants
and why hair transplants last.
Androgenic alopecia is genetically determined and its development is related to age and
presence of hormones and the corresponding receptors.
The second most common form of alopecia is alopecia areata.
This form of hair loss results in rapid loss of hair in circular or oval patches.
It may be episodic or persistent.
There is no definite reason why alopecia areata develops, but there is a genetic predisposition,
and popular opinion favors an autoimmune disorder.
Alopecia areata only affects 0.1% of people.
Approximately 3 months after surgery, childbirth, crash dieting, other stressful events, hair
can enter an extended resting cycle referred to as telogen effluvium.
Usually How is male patterned baldness (androgenic alopecia) classified?
Hamilton, an anatomist, recorded his observations of more than 300 men and graded their patterns
of hair loss in 1949.
Dr. O'tar Norwood, a dermatologist and distinguished hair transplant surgeon, expanded Hamilton's
classification after conducting his own study of 1,000 men.
The Norwood classification, published in 1975, is the most widely used classification for
hair loss in men.
It defines two major patterns and several less common types.
In the regular Norwood pattern, two areas of hair loss - a bitemporal recession and
thinning crown - gradually enlarge and coalesce until the entire front, top and crown (vertex)
of the scalp are bald.
Type 1: No or very minimal hairline recession along the anterior border in the frontotemporal
region.
Type 2: The anterior border of the hair in the frontotemporal region has symmetrc triangular
areas of recession which extend no further posteriorly than 2 cm anterior to a line drawn
in a coronal plane at the level of the external auditory meatus.
Type 3: The triangular areas in Type II extend posterior of the coronal plane which is 2
cm anterior to the external auditory meatus.
This is the minimal level considered to represent baldness.
Type 3 Vertex: Most of the hair loss is seen on the vertex.
Frontal hair loss may be similar to Types I or II but should not exceed Type III.
This type is most commonly seen with advancing age.
Type 4: Hair loss on the vertex associated with frontal loss more severe than Type III,
but the frontal and vertex areas are separated by a distinct band of hair.
Type 5: Greater hair loss than Type IV with only a sparse band of hair separating the
frontal and vertex areas.
The hair left on the occipital and parietal areas begins to form the shape of a horseshoe
when viewed from above (also true for Types VI and VII).
Type 6: The frontal and vertex areas of hair loss are contiguous with greater lateral and
posterior areas of denudation.
Type 7: The most severe form of male pattern baldness.
Only a narrow sparse horseshoe-shaped band of hair is left extending from the ears posteriorly
to the occiput.
In addition, Types II through V can also be designated with a Type A variant.
The major features of the type A variant are:
1) the entire anterior hairline border recedes in unison without leaving the midfrontal peninsula
of hair and
2) there is no simultaneous balding of the vertex.
The two minor features are
1) scattered sparse hairs frequently persisting in the entire area of balding and
2) the horseshoe shaped fringe of hair that remains on the sides and back tends to be
wider and reaches higher on the head.
These variants exist only in about 3% of the population studies.
Type IIA: The hairline is anterior to the coronal plane 2 cm anterior to the external
auditory meatus.
Type IIIA: The hairline has receded back to a point between the limit of Type IIA and
the level of the external auditory meatus.
Type IVA: The hairline has receded beyond the external auditory meatus but has not reached
the vertex.
Type VA: The area of denudation includes the vertex.
Hair loss more severe than Type VA cannot be distinguished from Types VI or VII.
Are medicines available for hair loss?
Topical minoxidil (Rogaine) and oral finasteride (Propecia) are the only treatments for male
patterned baldness that have been approved by the US FDA.
Their use is indicated
in men older than 18 years with mild to moderate hair loss.
Several well controlled studies have proven the efficacy of these medications.
After 3-6 months of use, slowed hair loss, stabilization, or increased scalp coverage
can be appreciated with either medication and results are clearly evident by 1 year.
Dense regrowth is uncommon and neither medication can regrow hair in completely bald areas.
Early intervention, when thinning is first noticed and hairs are incompletely miniaturized,
produces the best results.
Treatment must be continued indefinitely to maintain the benefits.
Stopping treatment results in a return to pretreatment status by 6 months with minoxidil
and by 12 months with finasteride.
For female pattern baldness, 2% topical minoxidil is the only FDA-approved medication.
Its use is indicated in women older than 18 years with mild to moderate hair loss.
Women who are pregnant or nursing should not use minoxidil.
The Best Candidates For Hair Replacement.
Hair replacement surgery can enhance your appearance and your self-confidence, but the
results won't necessarily match your ideal.
Before you decide to have surgery, think carefully about your expectations and discuss them with
your surgeon.
It's important to understand that all hair replacement techniques use your existing hair.
The goal of surgery is to find the most efficient uses for existing hair and consulting a hair
loss expert is key.
Hair replacement candidates must have healthy hair growth at the back and sides of the head
to serve as donor areas.
Donor areas are the places on the head from which grafts and flaps are taken.
Other factors, such as hair color, texture and waviness or curliness may also affect
the cosmetic result.
There are a number of techniques used in hair replacement surgery.
Sometimes, two or more techniques are used to achieve the best results.
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