The Achilles tendon is at the back of the heel. It can be ruptured by sudden force on the foot or ankle. If your Achilles tendon is ruptured you will be unable to stand on tiptoe, and will have a flat-footed walk. It is important to diagnose and treat this injury as soon as possible, to help promote healing. Treatment involves wearing a plaster cast or brace (orthosis) for several weeks, and possibly having an operation.
The Achilles tendon is an important part of the leg. It is located just behind and above the heel. It joins the heel bone to the calf muscles. Its function is to help in bending the foot downwards at the ankle (this movement is called plantar flexion by doctors).
If the Achilles tendon is torn, this is called an Achilles tendon rupture. The tear may be either partial or complete. In a partial tear, the tendon is partly torn but still joined to the calf muscle. With complete tears, the tendon is completely torn so that the connection between the calf muscles and the ankle bone is lost.
As with any muscle or tendon in the body, the Achilles tendon can be torn if there is a high force or stress on it. This can happen with activities which involve a forceful push off with the foot - for example, in football, running, basketball, diving, and tennis. The push off movement uses a strong contraction of the calf muscles which can stress the Achilles tendon too much.
The Achilles tendon can also be damaged by injuries such as falls, if the foot is suddenly forced into an upward-pointing position - this movement stretches the tendon. Another possible injury is a deep cut at the back of the ankle, which might go into the tendon.
Sometimes the Achilles tendon is weak, making it more prone to rupture. Factors that weaken the Achilles tendon are:
It affects about 1 in 5,000 people at any one time. It can occur at any age but is most common in people between the ages of 30 and 50.
You may notice the symptoms come on suddenly during a sporting activity or injury. You might hear a snap or feel a sudden sharp pain when the tendon is torn. The sharp pain usually settles quickly, although there may be some aching at the back of the lower leg. After the injury, the usual symptoms are:
If you suspect an Achilles tendon rupture, it is best to see a doctor urgently, because the tendon heals better if treated sooner rather than later.
The diagnosis is usually made on the basis of symptoms, the history of the injury and a doctor's examination.
The doctor may look at your walking and observe whether you can stand on tiptoe. She/he may test the tendon using a method called Thompson's test (also known as the calf squeeze test). In this test, you will be asked to lie face down on the examination bench and to bend your knee. The doctor will gently squeeze the calf muscles at the back of your leg, and observe how the ankle moves. If the Achilles tendon is OK, the calf squeeze will make the foot point briefly away from the leg (a movement called plantar flexion). This is quite an accurate test for Achilles tendon rupture.
If the diagnosis is uncertain, an ultrasound or MRI scan may help.
Note: an Achilles tendon rupture is sometimes difficult to diagnose and can be missed on first assessment. It is important for both doctors and patients to be aware of this and to look carefully for an Achilles tendon rupture if it is suspected.
Similar symptoms can be caused by inflammation of the Achilles tendon (Achilles tendonitis), a strain or tear of the calf muscles, thrombosis of a deep vein in the calf and arthritis of the ankle.
This condition should be diagnosed and treated as soon as possible, because prompt treatment probably improves recovery. You may need to be referred urgently to see a doctor in an orthopaedic department or accident and emergency department. Meanwhile, if a ruptured Achilles tendon is suspected, you should not put any weight on that foot, so do not walk on it at all.
There are two options for treatment. One option is an operation to repair the tendon surgically. The surgeon sews together the torn ends of the Achilles tendon, and perhaps may also use another tendon or a tendon graft to help with the repair. A plaster cast or brace (orthosis) is needed after the operation.
The other option is to allow time for the tendon to heal naturally, resting it in a brace or plaster cast. This is called conservative treatment. If the tendon does not heal on its own, a surgical repair can then be done later.
Both options will involve having a plaster cast or brace for about eight weeks, to protect the tendon while it heals. The plaster cast or brace is positioned so that the foot is pointing slightly downwards, which takes the strain off the tendon.
Traditionally, crutches were used to keep weight off the leg during the first few weeks of treatment. Now there is a trend towards early mobilisation. This involves fitting a plaster or brace which you can walk on. It is more convenient because you do not need to use crutches.
Physiotherapy is often provided as well.
There is debate as to which treatment is best: surgery or conservative treatment. This section summarises the research into treatment of Achilles tendon rupture.
Most of the research so far found that surgery has one advantage: it reduces the risk that the Achilles tendon will rupture again later (a problem known as re-rupture). The disadvantages of surgery are the risk of complications such as wound infection (see below), and the need for an operation.
For this reason, surgery may be recommended for younger people or those doing sports. Conservative treatment may be suggested for older or less active people, and for people wishing to avoid surgery. But the choice of treatment depends on individual preference and circumstances. Surgery may also be recommended if there has been a delay in starting treatment.
However, a new piece of research found that surgery and conservative treatment actually gave equally good results, when patients were also given early mobilisation treatment using a brace.
If an operation is needed, there is a type of surgery called percutaneous, which uses smaller cuts than the traditional operation. This seems to reduce the risk of getting a wound infection.
After surgery, a brace seems to be better than a plaster cast in terms of faster recovery and return to normal activities, a lower complication rate and patient preferences.
Generally, the outlook is good. However, the tendon does take time to heal, usually about six to eight weeks. More time will be needed after this to allow the muscles to regain their normal strength after being in a plaster or brace (orthosis). Depending on the type of work, some people need several weeks off work after an Achilles tendon rupture, and the time taken to return to sport is between 4 and 12 months.
Possible complications are as follows:
Not always. However, here are some suggestions to help to prevent this injury: