Logan Steele
The Achilles tendon is a thick band of tissue at the back of the lower leg that connects the calf muscles to the heel bone. It is the largest and strongest tendon in the human body. The Achilles tendon is susceptible to various injuries and conditions, such as Achilles tendinitis, an inflammation of the tendon often caused by overuse or repetitive strain. Other conditions include tendinosis, degeneration, rupture, and the buildup of cholesterol deposits. Achilles tendon injuries can cause pain, swelling, and reduced mobility, and are commonly associated with sports and exercise activities.
| Characteristics | Values |
|---|---|
| What is it? | A thick tendon located in the back of the lower leg |
| What does it connect? | The gastrocnemius and soleus muscles in the calf to an insertion point at the calcaneus (heel bone) |
| Is it the thickest tendon? | Yes, it is the thickest and strongest tendon in the human body |
| What does it allow humans to do? | Push off while walking, running, and jumping |
| Where do injuries commonly occur? | At the muscle-tendon junction – the area where the calf muscles join with the tendon |
| What are some common injuries? | Achilles tendinitis, Achilles tendinosis, Achilles tendon degeneration, rupture, and becoming embedded with cholesterol deposits (xanthomas) |
| What are the symptoms of Achilles tendinitis? | Pain, swelling, irritation, soreness, and stiffness |
| What are the symptoms of Achilles tendon rupture? | Sudden onset of sharp pain in the heel |
| What are the risk factors for Achilles tendinitis? | Sex (more common in men), age, obesity, flat arch in the foot, tight calf muscles, running in worn-out shoes, cold weather, hilly terrain, psoriasis, high blood pressure, and certain antibiotics |
| How can Achilles tendinitis be treated or prevented? | Physical therapy, stretching, eccentric strengthening exercises, orthotic devices, heel lifts, walking boot, and ESWT (Extracorporeal Shock Wave Therapy) |
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What You'll Learn
The Achilles tendon is the thickest tendon in the human body
The Achilles tendon, also known as the "tendo calcaneus" (Latin for "calcaneal tendon"), is the thickest tendon in the human body. Located at the back of the lower leg, it connects the calf muscles to the heel bone. The tendon was named after Achilles, a character from Greek mythology, in 1693 by Flemish/Dutch anatomist Philip Verheyen.
The Achilles tendon is the strongest tendon in the body and allows people to push off while walking, running, and jumping. It can receive load stress 3.9 times the body weight during a walk and 7.7 times the body weight while running. The tendon is subject to the highest loads in the body, with tensile loads of up to ten times the body's weight.
The Achilles tendon is formed by the confluence of the distal attachment of the gastrocnemius and soleus muscles to the calcaneus. The tendon begins near the middle of the calf and receives muscle fibers on its inner surface, particularly from the soleus muscle, up to its lower end. It then inserts into the middle part of the back of the calcaneus bone. The tendon spreads out at its lower end, so its narrowest part is about 4 cm (1.6 in) above its insertion.
The Achilles tendon is prone to injury and is the most commonly ruptured tendon. Achilles tendinitis, an inflammation of the tendon, is a common injury among athletes who run and jump. The tendon's poor blood supply, mostly from a recurrent branch of the posterior tibial artery, may contribute to its high susceptibility to injury and slower healing.
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It connects the calf muscles to the heel bone
The Achilles tendon, also known as the "tendo calcaneus" in Latin, is a thick band of tissue that connects the calf muscles to the heel bone. It is the strongest and thickest tendon in the human body. Located at the back of the lower leg, the Achilles tendon serves to attach the gastrocnemius and soleus muscles to the calcaneus (heel bone).
The Achilles tendon is an important structure that enables human locomotion and propulsion, allowing us to walk, run, jump, and push up on our toes. It is involved in plantar flexion of the foot, which brings the sole of the foot closer to the back of the leg. The tendon can withstand significant stress during activities such as running and jumping, but it is also susceptible to injuries and conditions such as tendinitis, tendinosis, and ruptures.
Tendinitis, or tendonitis, is an acute inflammation of the tendon that can occur within the tendon itself or at the point where it attaches to the heel bone. It is often associated with overuse, repetitive strain, or intense physical activity. Tendinosis, on the other hand, refers to the soreness or stiffness of the tendon, which can be worse with exercise and is also typically caused by overuse.
The Achilles tendon is prone to injuries, with the most common types being Achilles tendinopathy and sudden ruptures or tears. Tendinopathy is characterised by weakness due to tiny tears in the tendon. Ruptures can be partial or complete tears that occur when the tendon is stretched beyond its capacity. These injuries can cause pain, swelling, and reduced movement at the back of the ankle.
To prevent and treat Achilles tendon injuries, it is important to maintain flexibility and strength in the calf muscles. Stretching and strengthening exercises, such as calf stretches and eccentric strengthening, can help reduce stress on the tendon and improve overall lower leg health.
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Achilles tendinitis is a common overuse injury
The Achilles tendon is a thick tendon located at the back of the lower leg. It is the strongest tendon in the human body and allows people to push off while walking, running, jumping, and standing on their toes. The tendon connects the calf muscles to the heel bone.
The symptoms of Achilles tendinitis include persistent pain, swelling, stiffness, and tenderness around the Achilles tendon, as well as leg weakness. The pain is typically worse at the start of exercise and decreases thereafter. It can occur within the tendon itself or at the point where it attaches to the heel bone, known as the Achilles tendon insertion. Noninsertional Achilles tendinitis affects the middle portion of the tendon, while Insertional Achilles tendinitis affects the lower part of the heel where the tendon connects.
Certain factors can increase the risk of developing Achilles tendinitis. These include tight or weak calf muscles, flat arches, bone spurs, and overpronation of the ankles. Running in worn-out shoes, on hilly terrain, or in cold weather can also predispose individuals to this injury. Additionally, medical conditions such as psoriasis and high blood pressure are associated with a higher risk of Achilles tendinitis.
To treat Achilles tendinitis, rest, physical therapy, and supportive shoes are often recommended. Surgery may be required if symptoms persist or if a rupture occurs. It is important to seek medical attention if you experience severe pain or disability.
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Achilles tendon degeneration can be investigated with an MRI or ultrasound
The Achilles tendon, or heel cord, is a thick tendon located at the back of the lower leg. It is the thickest tendon in the human body and allows people to push off while walking, running, and jumping. The tendon connects the gastrocnemius and soleus muscles to the calcaneus (heel bone).
Achilles tendon degeneration, or tendinosis, can be investigated with an MRI or ultrasound. In both cases, the tendon is thickened and may demonstrate surrounding inflammation. Within the tendon, increased blood flow, tendon fibril disorganisation, and partial thickness tears may be identified.
MRI imaging is superior in the evaluation of various degenerative changes in the Achilles tendon. It can be used to assess postoperative complications of Haglund's syndrome and the elongation of the Achilles tendon after surgical or conservative treatment. However, ultrasound has been found to be a highly sensitive technique for evaluating tendon tears. Ultrasound imaging is limited in its ability to differentiate between partial Achilles rupture and local degenerative lesions.
Both imaging modalities have their advantages and disadvantages, and the choice between the two depends on the patient's presentation. While MRI has high specificity, ultrasound is more sensitive and may be used as a first-line imaging modality.
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Achilles tendon injuries can be treated with physical therapy
The Achilles tendon is a thick tendon located at the back of the lower leg. It is the thickest tendon in the human body and allows people to push off while walking, running, and jumping. The tendon connects the gastrocnemius and soleus muscles in the calf to the heel bone.
Achilles tendon injuries are common in athletes and active people. The injuries can occur in several places, but the most common area is the muscle-tendon junction, where the calf muscles join the tendon. Achilles tendon degeneration (tendinosis) is typically investigated with either an MRI or ultrasound.
Achilles tendinopathy results when the demand on the Achilles tendon is greater than its ability to function. The condition can occur after a single incident (acute injury) or after repetitive irritation or "microtrauma" (chronic injury). Most often, Achilles tendon pain is the result of repetitive trauma that can result in chronic Achilles tendinopathy—a gradual breakdown of the tissue. The condition is most often treated with physical therapy.
Physical therapy plays a big role in the rehabilitation of Achilles tendon injuries, either as a treatment method or as part of recovery from surgery. It can help patients regain their strength and function. Physical therapists are equipped to treat Achilles tendinopathy through pain-relief strategies, range-of-motion exercises, and muscle-strengthening exercises.
To address pain, therapists may apply ice to the affected area, put the affected leg in a brace, or use therapies such as iontophoresis (a medicated patch placed on the skin that is electrically charged and used to decrease pain and inflammation) or therapeutic ultrasound. For range-of-motion issues, self-stretching and manual therapy techniques (massage and movement) can be applied to the lower body to help restore and normalize motion in the foot, ankle, knee, and hip, thereby decreasing tension. Finally, muscle-strengthening exercises can correct any weakness-associated movement errors that may be contributing to the patient's pain.
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Frequently asked questions
The Achilles tendon is a thick tendon located in the back of the lower leg. It is also known as the "tendo calcaneus" (Latin for "calcaneal tendon"), or the heel cord.
The Achilles tendon connects the calf muscles to the heel bone. It is the thickest tendon in the human body and allows people to push off while walking, running, climbing stairs, and jumping.
The two most common injuries of the Achilles tendon are Achilles tendinopathy (weakness due to tiny tears in the tendon) and sudden rupture (break or tear) of the tendon. Achilles tendinitis is another common condition, caused by overuse, repetitive stress, or intense strain on the tendon.
Most Achilles tendon injuries do not require surgery and can be treated with physical therapy and exercises to strengthen the calf muscles and reduce stress on the tendon. To prevent injuries, it is important to properly stretch the lower leg and stay as fit as possible during the healing process. Swimming and other low-impact exercises are recommended.
