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The
most common form of heel pain, is pain on the bottom of the heel.
It tends to occur for no apparent reason and is often worse when
first placing weight on the foot.
Patients often complain of pain the first thing in the morning
or after getting up to stand after sitting. The pain can be a sharp,
searing pain or present as a tearing feeling in the bottom of the
heel. As the condition progresses there may be a throbbing pain
after getting off your feet or there may be soreness that radiates
up the back of the leg. Pain may also radiate into the arch of the
foot.
To understand the cause of the pain one must understand the anatomy
of the foot and some basic mechanics in the function of the foot.
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A thick ligament, called the plantar fascia, is attached into
the bottom of the heel and fans out into the ball of the foot, attaching
into the base of the toes. The plantar fascia is made of dense,
fibrous connective tissue that stretches very little. It acts something
like a shock absorber.
As the foot impacts the ground with each step, it flattens out,
lengthening the foot. This action pulls on the plantar fascia, which
stretches slightly. When the heel comes off the ground the tension
on the ligament is released. Anything that causes the foot to flatten
excessively will cause the plantar fascia to stretch greater than
it is accustomed to doing. One consequence of this is the development
of small tears where the ligament attaches into the heel bone. When
these small tears occur, a very small amount of bleeding occurs
and the tension of the plantar fascia on the heel bone may cause
a spur on the bottom of the heel to form. Pain experienced in the
bottom of the heel is not produced by the presence of the spur.
The pain is due to excessive tension of the plantar fascia as it
tears from its attachment into the heel bone. Heel spur formation
is secondary to the excessive pull of the plantar fascia where it
attaches to the heel bone. Many people have heel spurs at the attachment
of the plantar fascia without having any symptoms or pain. There
are some less common causes of heel pain but they are relatively
uncommon.
There are several factors that cause the foot to flatten and excessively
stretch the plantar fascia. The primary factor is the structure
of a joint complex below the ankle joint, called the subtalar joint.
The movement of this joint complex causes the arch of the foot to
flatten and to heighten. Flattening of the arch of the foot is termed
pronation and heightening of the arch is called supination. If there
is excessive pronation of the foot during walking and standing,
the plantar fascia is strained. Over time, this will cause a weakening
of the ligament where it attaches into the heel bone. When a person
is at rest and off their feet, the plantar fascia attempts to mend
itself. Then, with the first few steps the fascia re-tears causing
pain. Generally after the first few steps, the pain diminishes.
This is why the heel pain tends to be worse the first few steps
in the morning or after rest.
The diagnosis of heel pain
and heel spurs is made by a through history of the course of the
condition and by physical exam. Weight bearing x-rays are useful
in determining if a heel spur is present and to rule out other causes
of heel pain such as a stress fracture of the heel bone or the presence
of a bone tumor.
Oral anti-inflammatory
medications or cortisone injections can be helpful for acute pain.
Calf stretching exercises may also
be beneficial. If the problem does not resolve or recurs, functional
foot orthotics may be considered.
A functional orthotic is a device
that is prescribed and fitted by your foot doctor which fits in
normal shoes like an arch support. Unlike an arch support, the orthotic
corrects abnormal pronation of the subtalar joint. Thus orthotics
address the cause of the heel pain; abnormal pronation of the foot.
Surgery to correct heel pain is generally only recommended if
all other treatment has failed. Following surgical treatment to
correct heel pain the patient will generally have to continue the
use of orthotics. The surgery does not correct the cause of the
heel pain. The surgery may eliminate the pain but the process that
caused the pain will continue without the use of orthotics. If orthotics
have been prescribed prior to surgery they generally do not have
to be remade.
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