Achilles tendonitis
What is the Achilles Tendon?
The Achilles tendon is the strongest and largest tendon in the body. It
is a tendinous structure (attaches muscle to bone) that forms from a
combination of the gastrocnemius and soleus muscles located in the calf.
The tendon attaches to the heel bone (calcaneus) and causes the foot to
push off (plantar flex) when the calf muscles tighten. The tendon is
necessary for normal walking, running, and jumping. Athletic and
traumatic injuries to the Achilles tendon are common and can be
disabling.
What is this injury?
Tendinitis is inflammation of a tendon. Thus, Achilles tendinitis is an
inflammation of the Achilles tendon. The inflammation may be localized
to the end of the tendon closest to the heel or may spread upward to
affect even the muscles of the calf. Swelling often occurs and pain is
felt upon contraction of the calf muscles. In severe cases, pain may be
felt even at rest.
Generally, Achilles tendinitis begins as a dull pain at the back of
the lower leg just above the heel when pushing off the ground with the
foot. Unless the activity is stopped, the condition rapidly gets worse
until any activity requiring a push-off from the ground by the foot
becomes quite painful and nearly impossible. If it is left untreated, it
can develop into one of two more serious conditions — Achilles
tendinosis and Insertional Calcific Tendinitis. These are degenerative
change in the tendon and are very resistant to treatment. A normal
Achilles tendon in solid in color and crescent shaped, Figure 1.
Abnormal changes inside Achilles tendon called Achilles tendinosis,
Figure 2. Abnormal tendon usually thick and not solid black in color.
Will usually see white speckles in the tendon.
Figure 1: Normal Achilles
- Tendon dark in color and crescent shaped.
Figure 2: Achilles Tendinosis
- Thickening of the Achilles tendon. Tendon round and thick.
How does the injury occur?
The majority of Achilles tendon injuries are due to overuse injuries.
Other factors that lead to Achilles tendonitis are improper shoe
selection, inadequate stretching prior to engaging in athletics, a short
Achilles tendon, direct trauma (injury) to the tendon, training errors
and heel bone deformity.
There is significant evidence that people with feet that role in
excessively (over-pronate) are at greater risk for developing Achilles
tendinitis. The increased pronation puts additional stress on the
tendon, therefore, placing it at greater risk for injury.
How does over-pronation cause Achilles Tendinitis?
During normal gait, the thigh bone (femur) and the major leg bone
(tibia) rotate in unison as your foot goes through a normal rolling-in (pronation)
and rolling-out (supination).
However, when a person over-pronates, the tibia continues to rotate
internally when the femur is rotating externally. The resulting counter
rotation of the femur and the tibia causes a shearing force to occur in
the Achilles tendon. This occurs because the Achilles tendon is made of
two muscles—one of which (the Gastrocnemius) is attached to the femur
while the other (the Soleus) is attached to the tibia. This shearing
force twists the tendon at its weakest area, namely the Achilles tendon
itself, and causes the inflammation.
Because the over-pronation puts such a great stress on the Achilles
tendon, custom functional orthotics designed to control over-pronation
are an important part of the treatment plan for this problem.
Treatment
The latest studies on Achilles tendonitis recommend a treatment plan
that incorporates the following three components:
- Treatment of the inflammation
- Strengthening of the muscles that make up the Achilles tendon
using eccentric exercise
- Biomechanical control (the use of orthotics and proper shoes).
Achilles tendonitis should never be self-treated because of the
potential for permanent damage to the tendon. While you are waiting to
see your doctor, however, some patients have found relief from symptoms
with the use of
Silipos Achilles Heel Guard during the day and a
Night Splint at night. A topical pain reliever like
Orthogel Cold Therapy can provide temporary relief of pain.
These items, including a couple of different types of night splints are
available on the Achilles Tendonitis page at
www.FootAnkleStore.com.
Achilles tendonitis only gets worse with time. If you are
experiencing symptoms call
today for an evaluation in our convenient Seattle office.
All pages on this website © 2005-2009
Douglas Hale, DPM & Lawrence Huppin, DPM
Foot and Ankle Center of Washington, Seattle
The material provided on this web site is for informative purposes only.
If you need specific medical advice, please contact the office for an appointment.
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