An Achilles tendon rupture is also known as a rupture of the gastrocnemius tendon, or the common calcanean tendon. The tendon is actually composed of 5 different tendons, the two most important being the superficial digital flexor and gastrocnemius tendons. The gastrocnemius tendon is the largest of these, and is the most powerful extensor of the hock (ankle) joint. Both the superficial digital flexor and gastrocnemius tendons attach to the heel bone, called the calcaneus bone. A rupture of the Achilles tendon may be a partial tear, which means just the gastrocnemius is torn, or a complete tear, in which all five tendons have been torn. (show diagrams, normal anatomy vs partial vs complete tears).
Causes of and contributors to Achilles tendon rupture include trauma (caused by injury, usually an acceleration injury such as pushing off or jumping up). Preceding tendon problems. Chronic Achilles tendonitis (can lead to small tears within the tendon, increasingly weakening it). Certain drug therapies/treatments. Drugs that have been linked to Achilles tendon rupture include. Fluoroquinolone antibiotics - after nearly 900 reports of tendon ruptures, tendonitis and other tendon disorders (most associated with the Achilles tendon) linked to Ciprofloxacin (Cipro) alone were collected in the U.S. Food and Drug Administration (FDA)?s database, at least one public-interest group petitioned the FDA to recommend that a "Black Box Warning" be added to Cipro's packaging. Some researchers speculate this class of antibiotics is toxic to tendon fibers, and that in some cases may reduce their blood supply. Patients should at least be more aware of the potential for ruptures so that they can be switched to other antibiotics at the onset of early warning signals such as tendon pain.
Patients present with acute posterior ankle/heel pain and may give a history of ?felt like someone kicked me from behind?. Patients may report a direct injury, or report the pain started with jumping or landing on a dorsiflexed foot. It is important to elicit in the history any recent steroid or flouroqunolone usage including local steroid injections, and also any history of endocrine disorders or systemic inflammatory conditions.
The diagnosis of an Achilles tendon rupture is made entirely on physical examination. Often, there is a substantial defect in the Achilles from 2-5 cm before it inserts into the heel bone. However, the main test is to determine whether the Achilles has been ruptured is the Thompson test. This essentially involves placing the patient on their stomach and squeezing the calf muscle. If the Achilles is intact, the foot will rise [plantar flex]. If it is ruptured, the foot will not move and will tend to be in a lower lying position.
Non Surgical Treatment
Two treatment options are casting or surgery. If an Achilles tendon rupture is untreated then it may not heal properly and could lead to loss of strength. Decisions about treatment options should be made on an individual basis. Non-surgical management traditionally is selected for minor ruptures, less active patients, and those with medical conditions that prevent them from undergoing surgery. The goal of casting is to allow the tendon to slowly heal over time. The foot and ankle are positioned to bring the torn ends of the tendon close together. Casting or bracing for up to 12 weeks or more may be necessary. This method can be effective and avoids some risks, such as infection, associated with surgery. However, the likelihood of re-rupture may be higher with a non-surgical approach and recovery can take longer.
Operative treatment involves a 6cm incision along the inner side of the tendon. The torn ends are then strongly stitched together with the correct tension. After the operation a below knee half cast is applied for 2 weeks. At 2 weeks a brace will be applied that will allow you to move the foot and fully weight-bear for a further 6 weeks. After this you will need physiotherapy. Surgery carries the general risks of any operation but the risk of re-rupture is greatly reduced to 2%. The best form of treatment is controversial with good results being obtained by both methods but surgery is generally recommended for patients under 60 years of age who are fit and active with an intra-substance tear.