Achilles tendon pain should be treated at the earliest possible moment. Left untreated, the Achilles tendon can become thickened and scarred (a condition called Achilles tendonosis) and veryAchilles Tendonitis difficult to treat. Although we do provides some hints on home treatment for Achilles tendon problems, these should only be used while you are waiting to see a specialist about your injury. Don’t try to treat Achilles tendonitis yourself – see a sports medicine foot and ankle specialist who has extensive experience in treating Achilles tendon injuries as soon as possible.

If you are in the Seattle area contact us for an appointment and we will get you in as early as possible.

Video: How to Treat Achilles Tendonitis and Tendonosis

What is the Achilles Tendon?

achilles tendonitis

Figure 1: Normal Achilles – Tendon dark in color and crescent shaped.

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 Achilles Tendonitis?

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). On this MRI, the abnormal tendon usually shows as thick and not solid black in color. Will usually see white speckles in the tendon.

thick achilles tendon

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.

Treatment Options for Achilles Tendonitis

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. These are a very specific type of exercise that has been shown in multiple studies to be a critical component of recovering from Achilles tendonitis
  • Biomechanical control (the use of orthotics and proper shoes).
  • Shockwave therapy.

Below we will examine each of these treatments:

Orthotics for Achilles Tendonitis – What the Research Tells Us

A 2014 study looked at the effect of using foot orthotics on the Achilles tendon.  The researchers found that running with foot orthotics resulted in a significant decrease in Achilles tendon load compared to running without orthotics. This study indicates that  foot orthoses may act to reduce the incidence of chronic Achilles tendon pathologies in runners by reducing stress on the Achilles tendon1. Orthotics seem to reduce load on the Achilles tendon by reducing excessive pronation2

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.

Eccentric Exercise for Achilles Tendonitis

A number of well-respected papers over the past 15 years have stated that the best regime to cure an Achilles tendon problem involves eccentric loading (loading while the muscle and tendon are lengthening rather than shortening).3   Examples of eccentric exercises include standing on your toes on a step and lowering the heel, holding for a few seconds then coming up with the weight on the other leg. This will slowly stimulate the tendon to heel over 2-3 months if repeated twice daily, but caution is needed at first to ensure that more damage is not caused. Sometimes the tendon is too weak to stand the strain and needs careful supervision.   We will teach you proper technique so that the exercises are performed correctly and that injury is avoided.
Video: How to do Eccentric Exercise for Achilles Tendonitis

 Shockwave Therapy for Achilles Tendonosis

If the Achilles tendon becomes thickened (Achilles tendonosis), several studies have shown that the use of shockwave therapy can help stimulate healing. We usually will consider EPAT shockwave therapy when there is apparent thickening of the tendon and the patient is not responding to the standard initial treatments. Also, many times athletes will choose shockwave therapy as a treatment method that is more likely to allow them to continue training. At your visit we can help you decide if shock wave therapy is a good option to treat your Achilles tendon problem. Use this link to learn detailed information on the use of shockwave therapy.

Should Surgery Ever Be Considered for Treating Achilles Tendonitis?

Occasionally, conservative management of Achilles tendon conditions fails. This failure is more common in older male patients and those with longstanding symptoms, those who persist in full training despite symptoms or those who have uncorrected predisposing factors. In these cases, surgery may be indicated. It should be remembered, however, that the rehabilitation program, particularly for severe Achilles tendon injuries, is a slow, lengthy program. Surgery is only indicated when there is failure to progress in the rehabilitation program. Surgery should not be considered unless at least six months of appropriate conservative management has failed to lead to improvement.

Self Treatment of Achilles Tendonitis?

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 BioFreeze 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

Achilles tendonitis only gets worse with time. If you are experiencing symptoms Call today for an evaluation in our convenient Seattle office.


1Effects of foot orthoses on Achilles tendon load in recreational runners   J. Sinclair, J. Isherwood, P.J. Taylor. Clinical Biomechanics; August 2014.

2Effect of combined heel lift and medial wedge orthoses on lower limb kinematics in chronic Achilles tendonitis patients.  Harrison, AJ, Laxton, P and Bowden, PD 2001. Proceedings: International Conference on Biomechanics of the lower limb in health, disease and rehabilitation.

3Heavy-load eccentric calf muscle training for the treatment of chronic Achilles tendinosis. Alfredson H, Pietila T, Jonsson P, Lorentzon R.  Am J Sports Med 1998 May;26(3):360-366.    Department of Orthopaedic Surgery, University Hospital of Northern Sweden, Umea, Sweden

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