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INTRODUCTION
Freiberg's Infraction is a condition specific to the lesser
metatarsal heads, most commonly the second metatarsal. Also
known as avascular necrosis, or AVN, this condition results
in a focal loss of blood supply to the metatarsal head. Freiberg's
Infraction occurs at the metaphysis of the bone in a region
where the primary or nutrient artery of the bone supplies the
distal metatarsal. The result is a collapse of the metatarsal
head.
SYMPTOMS
- Pain and swelling localized to the metatarsal head are the
most specific symptoms. Pain may be increased with weight
bearing and typically becomes worse with the duration of time
spent on the feet. Patients may have only pinpoint tenderness
or may have difficulty walking.
- Patients typically present with pain, stiffness, and a limp.
History of trauma may or may not exist. The pain often is
vague, related to activity, and poorly localized to the forefoot.
Patients may describe a chronic history of forefoot pain with
episodic exacerbation or a sudden onset of pain related to
a specific injury.

CAUSES
- Probably results from stress or injury of the foot.
- Risk increases with certain factors:
- Overzealous conditioning routines, such as running, jumping
or jogging.
- Overweight.
- Male between 11 and 18.
- Rapid skeletal growth.
- The exact nature of the cause of Freiberg disease is unknown.
It most likely is multi factorial, including vascular and
traumatic injuries. Certain patients may be anatomically predisposed
based on local mechanical, vascular, and developmental factors.
Whether or not the process is the same for older patients
as it is for adolescents is unknown. The relative infrequency
of the disease, as well as the variable presentation regarding
age and injury, makes the study of various causes challenging.
In the future, genetic or other variables that play a role
in the development of Freiberg disease may be identified.
Further investigation is needed.
WHAT
YOU SHOULD DO
- Help an overweight child lose weight.
- Encourage your child to exercise moderately, avoiding extremes.
WHAT
YOU SHOULD NOT DO
- Ignore
the pain. You can not grow out of this disease!
WHAT
THE CHIROPODIST/ FAMILY DOCTOR WILL DO
Treatment tends to vary based upon the level of collapse. Treatment
should include support with padding or orthotics.
Casting may be used in the early levels to
decrease the tendency of the distal bone to collapse. Steroid
injections may help to relieve pain and reduce inflammation
of the joint capsule. Sometimes simple rest for 1-4 months with
no sporting activity may be adequate for a teenager to be treated
of this condition.
Surgical correction may include simple debridement of the joint
with revision of the cartilage. Tip-up osteotomies of the metatarsal
are used to deflect the eroded cartilage away from the joint
space bringing new cartilage from the bottom of the joint into
the central aspect of the joint. Joint implants have also been
used with marginal success.
The long term success of the treatment of Freiberg's Infraction
varies. Active patients, such as athletes tend to have greater
residual disability.

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If you have any doubts about your child's foot health
visit a chiropodist or podiatrist for a evaluation.
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