Achilles tendon rupture
Encyclopedia
The Achilles tendon
Achilles tendon
The Achilles tendon , also known as the calcaneal tendon or the tendo calcaneus, is a tendon of the posterior leg. It serves to attach the plantaris, gastrocnemius and soleus muscles to the calcaneus bone.- Anatomy :The Achilles is the tendonous extension of 3 muscles in the lower leg:...

is the most commonly injured tendon
Tendon
A tendon is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension. Tendons are similar to ligaments and fasciae as they are all made of collagen except that ligaments join one bone to another bone, and fasciae connect muscles to other...

. Rupture can occur while performing actions requiring explosive acceleration, such as pushing off or jumping. The male to female ratio for Achilles tendon rupture varies between 7:1 and 4:1 across various studies.

Anatomy

The Achilles tendon is the strongest and thickest tendon
Tendon
A tendon is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension. Tendons are similar to ligaments and fasciae as they are all made of collagen except that ligaments join one bone to another bone, and fasciae connect muscles to other...

 in the body, connecting the gastrocnemius and soleus to the calcaneus. It is approximately 15 centimeters (5.9 inches) long and begins near the middle portion of the calf. Contraction of the gastrosoleus plantarflexes
Plantarflexion
Plantarflexion is the movement which increases the approximate 90 degree angle between the front part of the foot and the shin, as when depressing an automobile pedal...

 the foot, enabling such activities as walking and jumping. The Achilles tendon receives its blood supply from its musculotendinous junction with the triceps surae
Triceps surae
The triceps surae is a pair of muscles located at the calf - the gastrocnemius and the soleus...

 and its innervation from the sural nerve and to a lesser degree from the tibial nerve.

Causes

The Achilles tendon is most commonly injured by sudden plantarflexion
Plantarflexion
Plantarflexion is the movement which increases the approximate 90 degree angle between the front part of the foot and the shin, as when depressing an automobile pedal...

 or dorsiflexion
Dorsiflexion
Dorsiflexion is the movement which decreases the angle between the dorsum of the foot and the leg, so that the toes are brought closer to the shin. The movement moving in opposite directions is called plantarflexion...

 of the ankle, or by forced dorsiflexion of the ankle outside its normal range of motion.

Other mechanisms by which the Achilles can be torn involve sudden direct trauma to the tendon, or sudden activation of the Achilles after atrophy
Atrophy
Atrophy is the partial or complete wasting away of a part of the body. Causes of atrophy include mutations , poor nourishment, poor circulation, loss of hormonal support, loss of nerve supply to the target organ, disuse or lack of exercise or disease intrinsic to the tissue itself...

 from prolonged periods of inactivity. Some other common tears can occur from overuse while participating in intense sports. Twisting or jerking motions can also contribute to injury.

Fluoroquinolone antibiotics, famously ciprofloxacin, are known to increase the risk of tendon rupture, particularly achilles.

Risk factors

People that commonly fall victim to Achilles rupture or tear include recreational athletes, people of old age, individuals with previous Achilles tendon tears or ruptures, previous tendon injections or quinolone
Quinolone
The quinolones are a family of synthetic broad-spectrum antibiotics. The term quinolone refers to potent synthetic chemotherapeutic antibacterials....

 use, extreme changes in training intensity or activity level, and participation in a new activity.

Most cases of Achilles tendon rupture are traumatic sports injuries
Sports injuries
Sports injuries are injuries that occur in athletic activities. In many cases, these types of injuries are often due to overuse or acute trauma of a part of the body when participating in a certain activity. For example, runner's knee is a painful condition generally associated with running, while...

. The average age of patients is 30–40 years with a male-to-female ratio of nearly 20:1. Fluoroquinolone
Quinolone
The quinolones are a family of synthetic broad-spectrum antibiotics. The term quinolone refers to potent synthetic chemotherapeutic antibacterials....

 antibiotics, such as ciprofloxacin
Ciprofloxacin
Ciprofloxacin is a synthetic chemotherapeutic antibiotic of the fluoroquinolone drug class.It is a second-generation fluoroquinolone antibacterial. It kills bacteria by interfering with the enzymes that cause DNA to rewind after being copied, which stops synthesis of DNA and of...

, and glucocorticoid
Glucocorticoid
Glucocorticoids are a class of steroid hormones that bind to the glucocorticoid receptor , which is present in almost every vertebrate animal cell...

s have been linked with an increased risk of Achilles tendon rupture. Direct steroid injections into the tendon have also been linked to rupture.

Quinolone
Quinolone
The quinolones are a family of synthetic broad-spectrum antibiotics. The term quinolone refers to potent synthetic chemotherapeutic antibacterials....

 has been associated with Achilles tendinitis and Achilles tendon ruptures for quite some time now. Quinolones are antibacterial agents that act at the level of DNA by inhibiting DNA Gyrase. DNA Gyrase
DNA gyrase
DNA gyrase, often referred to simply as gyrase, is an enzyme that relieves strain while double-stranded DNA is being unwound by helicase. This causes negative supercoiling of the DNA...

 is an enzyme used to unwind double stranded DNA
DNA
Deoxyribonucleic acid is a nucleic acid that contains the genetic instructions used in the development and functioning of all known living organisms . The DNA segments that carry this genetic information are called genes, but other DNA sequences have structural purposes, or are involved in...

 which is essential to DNA Replication
DNA replication
DNA replication is a biological process that occurs in all living organisms and copies their DNA; it is the basis for biological inheritance. The process starts with one double-stranded DNA molecule and produces two identical copies of the molecule...

. Quinolone is specialized in the fact that it can attack bacterial DNA and prevent them from replicating by this process, and are frequently prescribed to elderly. Approximately 2% to 6% of all elderly people over the age of 60 that have had Achilles ruptures can be attributed to the use of quinolones.

Diagnosis

Diagnosis
Diagnosis
Diagnosis is the identification of the nature and cause of anything. Diagnosis is used in many different disciplines with variations in the use of logics, analytics, and experience to determine the cause and effect relationships...

 is made by clinical history; typically people say it feels like being kicked or shot behind the ankle
Ankle
The ankle joint is formed where the foot and the leg meet. The ankle, or talocrural joint, is a synovial hinge joint that connects the distal ends of the tibia and fibula in the lower limb with the proximal end of the talus bone in the foot...

. Upon examination a gap may be felt just above the heel unless swelling has filled the gap and the Simmonds' test
Simmonds' test
Simmonds' test is used in lower limb examination to test for the rupture of the achilles tendon. The patient lies face down with feet hanging off the edge of the bed...

 (aka Thompson test) will be positive; squeezing the calf muscles of the affected side while the patient lies prone, face down, with his feet hanging loose results in no movement (no passive plantarflexion) of the foot, while movement is expected with an intact Achilles tendon and should be observable upon manipulation of the uninvolved calf. Walking will usually be severely impaired, as the patient will be unable to step off the ground using the injured leg. The patient will also be unable to stand up on the toes of that leg, and pointing the foot downward (plantarflexion
Plantarflexion
Plantarflexion is the movement which increases the approximate 90 degree angle between the front part of the foot and the shin, as when depressing an automobile pedal...

) will be impaired. Pain may be severe and swelling is common.

An O'Brien test can also be performed which entails placing a sterile needle through the skin and into the tendon. If the needle hub moves in the opposite direction of the tendon and the same direction as the toes when the foot is moved up and down then the tendon is at least partially intact.

Sometimes an ultrasound
Medical ultrasonography
Diagnostic sonography is an ultrasound-based diagnostic imaging technique used for visualizing subcutaneous body structures including tendons, muscles, joints, vessels and internal organs for possible pathology or lesions...

 scan may be required to clarify or confirm the diagnosis. MRI can also be used to confirm the diagnosis.

Clinical diagnosis

Musculoskeletal ultrasonography can be used to determine the tendon thickness, character, and presence of a tear. It works by sending extremely high frequencies of sound through your body. Some of these sounds are reflected back off the spaces between interstitial fluid and soft tissue or bone. These reflected images can be analyzed and computed into an image. These images are
captured in real time and can be very helpful in detecting movement of the tendon and visualising possible injuries or tears. This device makes it very easy to spot structural damages to soft tissues, and consistent method of detecting this type of injury This imaging modality is inexpensive, involves no ionizing radiation and, in the hands of skilled ultrasonographers, may be very reliable.

Magnetic resonance imaging (MRI) can be used to discern incomplete ruptures from degeneration of the Achilles tendon, and MRI can also distinguish between paratenonitis, tendinosis, and bursitis. This technique uses a strong uniform magnetic field to align millions of protons running through the body. these protons are then bombarded with radio waves that knock some of them out of alignment. When these protons return they emit their own unique radio waves that can be analysed by a computer in 3D to create sharp cross sectional image of the area of interest. MRI can provide unparalleled contrast in soft tissue for an extremely high quality photograph making it east for technicians to spot tears and other injuries.

Radiography
Radiography
Radiography is the use of X-rays to view a non-uniformly composed material such as the human body. By using the physical properties of the ray an image can be developed which displays areas of different density and composition....

can also be used to indirectly identify achilles tears. Radiography uses X-rays to analyse the point of injury. This is not very effective at identifying injuries to soft tissue. X-rays are created when high energy electrons hit a metal source. X-ray images are acquired by utilising the different attenuation characteristics of dense (e.g. calcium in bone) and less dense (e.g. muscle) tissues when these rays pass through tissue and are captured on film. X-rays are generally exposed to optimise visualisation of dense objects such as bone while soft tissue remains relatively undifferentiated in the background. Radiography has little role in assessment of Achilles' tendon injury and is more useful for ruling out other injuries such as calcaneal fractures.

Treatment

Treatment options for an Achilles tendon rupture include surgical and non-surgical approaches. Among the medical profession opinions are divided what is to be preferred.

Non-surgical management traditionally was selected for minor ruptures, less active patients, and those with medical conditions that prevent them from undergoing surgery. It traditionally consisted of restriction in a plaster cast for six to eight weeks with the foot pointed downwards (to oppose the ends of the ruptured tendon). But recent studies have produced superior results with much more rapid rehabilitation in fixed or hinged boots.
Some surgeons feel an early surgical repair of the tendon is beneficial. The surgical option was long thought to offer a significantly smaller risk of re-rupture compared to traditional non-operative management (5% vs 15%). Of course, surgery
Surgery
Surgery is an ancient medical specialty that uses operative manual and instrumental techniques on a patient to investigate and/or treat a pathological condition such as disease or injury, or to help improve bodily function or appearance.An act of performing surgery may be called a surgical...

 imposes higher relative risks of perioperative mortality
Perioperative mortality
Perioperative mortality is mortality in relation to surgery, often defined as death within two weeks of a surgical procedure. An important consideration in the decision to perform any surgical procedure is to weigh the benefits against the risks...

 and morbidity e.g. infection
Infection
An infection is the colonization of a host organism by parasite species. Infecting parasites seek to use the host's resources to reproduce, often resulting in disease...

 including MRSA, bleeding
Bleeding
Bleeding, technically known as hemorrhaging or haemorrhaging is the loss of blood or blood escape from the circulatory system...

, deep vein thrombosis
Deep vein thrombosis
Deep vein thrombosis is the formation of a blood clot in a deep vein. Deep vein thrombosis commonly affects the leg veins or the deep veins of the pelvis. Occasionally the veins of the arm are affected...

, lingering anesthesia
Anesthesia
Anesthesia, or anaesthesia , traditionally meant the condition of having sensation blocked or temporarily taken away...

 effects, etc.

However, four recent studies have scientifically tested the benefits of surgery, using randomized streaming of patients into surgical and non-surgical protocols, and applying virtually identical (and aggressive) rehabilitation protocols to both types of patients. All four such studies completed to date have found only small, but statistically significant benefits from the surgery, separated from the other confounding variables. They have all produced reasonably comparable results in re-rupture rates (with each study adding a cautious note about small sample size, one study showing 12% re-rupture in non-surgical treatment vs 4% re-rupture in surgical, which is statistical insignificant), strength, and range of motion, while most have reaffirmed the greater complication rate from surgery. Two studies showed small, but statistically significant differences in plantarflexion strength. The surgical group had significantly better results in the heel-rise work, heel-rise height, concentric power, and hopping tests at the 6-month evaluation than did the nonsurgical group. However, at the 12-month evaluation, there was a significant between-groups difference only in the heel-rise work test.

Judging by the consistent results of these modern randomized trials, it is the opinion of some that the long-believed benefits of surgery, reinforced by virtually all studies done before 2007, were primarily artifacts of a selection bias, directing younger, healthier, and fitter patients to surgery, and the rest to non-surgical immobilization. Nonetheless, many "experts" continue to promote Achilles repair surgery, often citing older studies and statistics. However, this point remains a subject of debate, with even the authors of said studies cautious about the preferred treatment, stating that the rate of re-rupture in non-surgical treatment as something that might be deemed "clinically important". What seems to be most important to glean from each study is the importance of early mobilization, regardless of method of treatment.

Surgery

There are two different types of surgeries; open surgery and percutaneous surgery.

During an open surgery an incision is made in the back of the leg and the Achilles tendon is stitched together. In a complete or serious rupture the tendon of plantaris or another vestigial muscle is harvested and wrapped around the Achilles tendon, increasing the strength of the repaired tendon. If the tissue quality is poor, e.g. the injury has been neglected, the surgeon might use a reinforcement mesh (collagen
Collagen
Collagen is a group of naturally occurring proteins found in animals, especially in the flesh and connective tissues of mammals. It is the main component of connective tissue, and is the most abundant protein in mammals, making up about 25% to 35% of the whole-body protein content...

, Artelon
Artelon
Artelon is a biomaterial developed and sold by the Swedish company Artimplant. Artelon is a porous polyurethaneurea and acts as a scaffold which promotes ingrowth of native human tissue. Artelon degrades over a period of around 5–7 years during which time most of the material is replaced by native...

 or other degradable material).

In percutaneous
Percutaneous
In surgery, percutaneous pertains to any medical procedure where access to inner organs or other tissue is done via needle-puncture of the skin, rather than by using an "open" approach where inner organs or tissue are exposed .The percutaneous approach is commonly used in vascular procedures...

 surgery, the surgeon makes several small incisions, rather than one large incision, and sews the tendon back together through the incision(s). Surgery may be delayed for about a week after the rupture to let the swelling
Swelling
Swelling , is the enlargement of tissue.Swelling can also mean:*Die swell, the increase of volume of material due to absorption of a solvent, common for plastic polymers*Neutron-induced swelling caused by neutron radiation....

go down. For sedentary patients and those who have vasculopathy or risks for poor healing, percutaneous surgical repair may be a better treatment choice than open surgical repair.

Rehabilitation

Non-surgical treatment used to involve very long periods in a series of casts, and took longer to complete than surgical treatment. But both surgical and non-surgical rehabilitation protocols have recently become quicker, shorter, more aggressive, and more successful. It used to be that patients who underwent surgery would wear a cast for approximately 4 to 8 weeks after surgery and were only allowed to gently move the ankle once out of the cast. Recent studies have shown that patients have quicker and more successful recoveries when they are allowed to move and lightly stretch their ankle immediately after surgery. To keep their ankle safe these patients use a removable boot while walking and doing daily activities. Modern studies including non-surgical patients generally limit non-weight-bearing (NWB) to two weeks, and use modern removable boots, either fixed or hinged, rather than casts. Physiotherapy is often begun as early as two weeks following the start of either kind of treatment.

There are three things that need to be kept in mind while rehabilitating a ruptured Achilles: range of motion, functional strength, and sometimes orthotic support. Range of motion is important because it takes into mind the tightness of the repaired tendon. When beginning rehab a patient should perform stretches lightly and increase the intensity as time and pain permits. Putting linear stress on the tendon is important because it stimulates connective tissue repair, which can be achieved while performing the “runners stretch,” (putting your toes a couple inches up the wall while your heel is on the ground). Doing stretches to gain functional strength are also important because it improves healing in the tendon, which will in turn lead to a quicker return to activities. These stretches should be more intense and should involve some sort of weight bearing, which helps reorient and strengthen the collagen fibers in the injured ankle. A popular stretch used for this phase of rehabilitation is the toe raise on an elevated surface. The patient is to push up onto the toes and lower his or her self as far down as possible and repeat several times. The other part of the rehab process is orthotic support. This doesn’t have anything to do with stretching or strengthening the tendon, rather it is in place to keep the patient comfortable. These are custom made inserts that fit into the patients shoe and help with proper pronation of the foot, which is otherwise a problem that can lead to problems with the Achilles.

To briefly summarize the steps of rehabilitating a ruptured Achilles tendon, you should begin with range of motion type stretching. This will allow the ankle to get used to moving again and get ready for weight bearing activities. Then there is functional strength, this is where weight bearing should begin in order to start strengthening the tendon and getting it ready to perform daily activities and eventually in athletic situations.

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK