The Achilles tendon or heel cord, also known as the calcaneal tendon, is a tendon of the back of the leg, and the thickest in the human body. It serves to attach the plantaris, gastrocnemius (calf) and soleus muscles to the calcaneus (heel) bone. These muscles, acting via the tendon, cause plantar flexion of the foot at the ankle, and (except soleus) flexion at the knee.
The Achilles tendon or calcaneal tendon is attached to the gastrocnemius and soleus muscles.
|Location||Back of the lower leg|
|Latin||tendo calcaneus, tendo Achillis|
The Achilles tendon connects muscle to bone, like other tendons, and is located at the back of the lower leg. The Achilles tendon connects the gastrocnemius and soleus muscles to the calcaneal tuberosity on the calcaneus (heel bone). The tendon begins near the middle of the calf, and receives muscle fibers on its inner surface, particularly from the soleus muscle, almost to its lower end. Gradually thinning below, it inserts into the middle part of the back of the calcaneus bone. The tendon spreads out somewhat at its lower end so that its narrowest part is about 4 cm (1.6 in) above its insertion.
The tendon is covered by the fascia and skin, and stands out prominently behind the bone; the gap is filled up with areolar and adipose tissue. A bursa lies between the tendon and the upper part of the calcaneus. It is about 15 centimetres (6 in) long. Along the side of the muscle, and superficial to it, is the small saphenous vein. The sural nerve the outer border of the tendon about 10 cm below where it attaches to the bone. The tendon is the thickest tendon in the human body. It can receive a load stress 3.9 times body weight during walking and 7.7 times body weight when running.
Acting via the Achilles tendon, the gastrocnemius and soleus muscles cause plantar flexion of the foot at the ankle. This action brings the sole of the foot closer to the back of the leg. The gastrocnemius also flexes the leg at the knee. Both muscles are innervated by the tibial nerve. Because the fibres of the tendon spiral about 90 degrees, fibres from the gastrocnemius tend to attach to the outer part of the bone, whereas fibres from the solus tend to attach closer to the midline.
Vibration of the tendon without vision has a major impact on postural orientation. Vibration of the tendon causes movement backwards and the illusion of a forward body tilt in standing subjects. This is because vibrations stimulate muscle spindles in the calf muscles. The muscle spindles alert the brain that the body is moving forward, so the central nervous system compensates by moving the body backwards.
Inflammation of the Achilles tendon is called Achilles tendinitis. Achilles tendinosis is the soreness or stiffness of the tendon, particularly worse when exercising, and generally due to overuse. The most common symptoms are pain and swelling around the affected tendon. The pain is typically worse at the start of exercise and decreases thereafter. Stiffness of the ankle may also be present. Onset is generally gradual.
It commonly occurs as a result of overuse such as running. Other risk factors include trauma, a lifestyle that includes little exercise, high-heel shoes, rheumatoid arthritis, and medications of the fluoroquinolone or steroid class. Diagnosis is generally based on symptoms and examination.
While stretching and exercises to strengthen the calf are often recommended for prevention, evidence to support these measures is poor. Treatment typically involves rest, ice, non-steroidal antiinflammatory agents (NSAIDs), and physical therapy. A heel lift or orthotics may also be helpful. In those in who symptoms last more than six months despite other treatments, surgery may be considered. Achilles tendinitis is relatively common.
Achilles tendon degeneration (tendinosis) is typically investigated with either MRI or ultrasound. In both cases, the tendon is thickened, may demonstrate surrounding inflammation by virtue of the presence of paratenonitis, retrocalcaneal or retro-achilles bursitis. Within the tendon, increased blood flow, tendon fibril disorganisation, and partial thickness tears may be identified. Achilles tendinosis frequently involves the mid portion of the tendon but may involve the insertion, which is then known as enthesopathy. Though enthesopathy may be seen in the context of advancing age, it is also associated with arthritis such as gout and the seronegative spondyloarthitides. Achilles tendinosis is a known risk factor for calf muscle tears.
Achilles tendon rupture is when the Achilles tendon breaks. Symptoms include the sudden onset of sharp pain in the heel. A snapping sound may be heard as the tendon breaks and walking becomes difficult.
Rupture typically occurs as a result of a sudden bending up of the foot when the calf muscle is engaged, direct trauma, or long-standing tendonitis. Other risk factors include the use of fluoroquinolones, a significant change in exercise, rheumatoid arthritis, gout, or corticosteroid use. Diagnosis is typically based on symptoms and examination and supported by medical imaging. Achilles tendon rupture occurs in about 1 per 10,000 people per year. Males are more commonly affected than females. People in their 30s to 50s are most commonly affected.
Prevention may include stretching before activity. Treatment may be by surgery or casting with the toes somewhat pointed down. Relatively rapid return to weight bearing (within 4 weeks) appears okay. The risk of re-rupture is about 25% with casting. If appropriate treatment does not occur within 4 weeks of the injury outcomes are not as good.
The Achilles' tendon is often tested as part of a neurological examination. In this examination, the tendon is hit with a tendon hammer. This tests the S1 and S2 spinal nerves: a normal response is plantar flexion (downward movement) of the foot.
Level or portion of tendon affected 
- Paratendinopathy: The inflammation of a connective tissue sleeve which surrounds the tendon and protects it from friction, irritation, and repeated trauma
- Insertional: Eminently overuse-injury which frequently occurs in running and jumping athletes. Patients affected by insertional Achilles tendinopathy complain of pain on the posterior aspect of the heel and may have morning stiffness, swelling with activity and tenderness at the tendon insertion level. If this condition becomes chronic, calcific deposits at the Achilles insertional level may be developed (due to microfractures and healing of the osteotendinous union) which can degenerate, if it persists over time, in the abnormal bony prominence on the posterior aspect of heel, condition known as Haglund deformity, which can be painful and difficult close-shoes fitting due to friction and irritation.
- Mid-portion: Occurs approximately 2 – 7 cm proximal from the Achilles insertion into the calcaneus. Characterized by a combination of pain and swelling at this level. It has associated a remarkable impaired performance.
Apart from humans, the Achilles tendon is short or absent in great apes, but long in arboreal gibbons and humans. It provides elastic energy storage in hopping, walking, and running. Computer models suggest this energy storage Achilles tendon increases top running speed by >80% and reduces running costs by more than three-quarters. It has been suggested that the "absence of a well-developed Achilles tendon in the nonhuman African apes would preclude them from effective running, both at high speeds and over extended distances."
The oldest-known written record of the tendon being named for Achilles is in 1693 by the Flemish/Dutch anatomist Philip Verheyen. In his widely used text Corporis Humani Anatomia he described the tendon's location and said that it was commonly called "the cord of Achilles." The tendon has been described as early as the time of Hippocrates, who described it as the "tendo magnus" (Latin: great tendon) and by subsequent anatomists prior to Verheyen as "chorda Hippocratis".
Verheyen referred to the mythological account of Achilles being held by the heel by his mother Thetis when she dipped him in the River Styx as a baby to render his body invulnerable. As the heel by which she held him was not touched by the water, it was his one vulnerable spot (hence the expression "Achilles' heel") and he was eventually killed by a poison dart to the heel. The name thus also refers to the particularly disabling and painful effect of an injury to this tendon. The first closed rupture was described by Ambroise Pare in the sixteenth century.
The Achilles tendon is also known as the "tendo calcaneus" (Latin: calcaneal tendon). Because eponyms (names relating to people) have no relationship to the subject matter, most anatomical eponyms also have scientifically descriptive terms. The term calcaneal comes from the Latin calcaneum, meaning heel.
- Doral MN, Alam M, Bozkurt M, Turhan E, Atay OA, Dönmez G, Maffulli N (May 2010). "Functional anatomy of the Achilles tendon". Knee Surg Sports Traumatol Arthrosc. 18 (5): 638–43. doi:10.1007/s00167-010-1083-7. PMID 20182867.
- Louise Spilsbury; Richard Spilsbury (2017-07-15). The Science of the Skeleton and Muscles. Gareth Stevens Publishing LLLP. pp. 32–. ISBN 978-1-5382-0699-7.
- Tobias Gibson Richardson (1854). Elements of human anatomy: general, descriptive, and practical. Lippincott, Grambo, and Co. pp. 441–.
- E. Dalton McGlamry; Alan S. Banks (2001-06-01). McGlamry's comprehensive textbook of foot and ankle surgery. Lippincott Williams & Wilkins. ISBN 978-0-683-30471-8.
- Gerard Thorne; Phil Embleton (1997). Robert Kennedy's Musclemag International Encyclopedia of Bodybuilding: The Ultimate A-Z Book on Muscle Building!. Musclemag International. ISBN 978-1-55210-001-1.
- Robert Schleip; Thomas W. Findley; Leon Chaitow; Peter Huijing (2013-02-26). Fascia: The Tensional Network of the Human Body: The science and clinical applications in manual and movement therapy. Elsevier Health Sciences. pp. 218–. ISBN 978-0-7020-5228-6.
- Carol Ballard (2003-06-27). Muscles. Heinemann Library. ISBN 978-1-4034-3300-8.
- Ort, Bruce Ian Bogart, Victoria (2007). Elsevier's integrated anatomy and embryology. Philadelphia, Pa.: Elsevier Saunders. p. 225. ISBN 978-1-4160-3165-9.
- Standring S, Borley NR, eds. (2008). Gray's anatomy : the anatomical basis of clinical practice. Amis A, Bull A, Gupte CM (40th ed.). London: Churchill Livingstone. p. 1451. ISBN 978-0-8089-2371-8.
- Giddings, VL; Beaupré, GS; Whalen, RT; Carter, DR (2000). "Calcaneal loading during walking and running". Medicine and Science in Sports and Exercise. 32 (3): 627–34. CiteSeerX 10.1.1.482.4683. doi:10.1097/00005768-200003000-00012. PMID 10731005.
- Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students. Philadelphia: Elsevier/Churchill Livingstone. p. 546. ISBN 978-0-8089-2306-0.
- Effects of bilateral Achilles tendon vibration on postural orientation and balance during standing, 2007 International Federation of Clinical Neurophysiology. Published by Elsevier Inc.
- Ceyte, Hadrien; Cian, Corinne; Zory, Raphael; Barraud, Pierre-Alain; Roux, Alain; Guerraz, Michel (April 2007). "Effect of Achilles tendon vibration on postural orientation". Neuroscience Letters. 416 (1): 71–75. doi:10.1016/j.neulet.2007.01.044. PMID 17300868.
- Kadakia, Anish R. "Achilles Tendinitis - OrthoInfo - AAOS". OrthoInfo. Retrieved 4 July 2018.
- Hubbard, MJ; Hildebrand, BA; Battafarano, MM; Battafarano, DF (June 2018). "Common Soft Tissue Musculoskeletal Pain Disorders". Primary Care. 45 (2): 289–303. doi:10.1016/j.pop.2018.02.006. PMID 29759125.
- "Achilles Tendinitis". MSD Manual Professional Edition. March 2018. Retrieved 27 June 2018.
- "Achilles Tendinitis". OrthoInfo - AAOS. June 2010. Retrieved 26 June 2018.
- Park, DY; Chou, L (December 2006). "Stretching for prevention of Achilles tendon injuries: a review of the literature". Foot & Ankle International. 27 (12): 1086–95. CiteSeerX 10.1.1.1012.5059. doi:10.1177/107110070602701215. PMID 17207437.
- Peters, JA; Zwerver, J; Diercks, RL; Elferink-Gemser, MT; van den Akker-Scheek, I (March 2016). "Preventive interventions for tendinopathy: A systematic review". Journal of Science and Medicine in Sport. 19 (3): 205–211. doi:10.1016/j.jsams.2015.03.008. PMID 25981200.
- "Achilles tendinitis - Symptoms and causes". Mayo Clinic. Retrieved 27 June 2018.
- Koulouris G, Ting AY, Jhamb A, Connell D, Kavanagh EC (2007). "Magnetic resonance imaging findings of injuries to the calf muscle complex". Skeletal Radiol. 36 (10): 921–7. doi:10.1007/s00256-007-0306-6. PMID 17483942.
- Ferri, Fred F. (2015). Ferri's Clinical Advisor 2016 E-Book: 5 Books in 1. Elsevier Health Sciences. p. 19. ISBN 9780323378222.
- Gossman, WG; Bhimji, SS (January 2018). "Achilles Tendon, Rupture". StatPearls. PMID 28613594.
- "Achilles Tendon Tears". MSD Manual Professional Edition. August 2017. Retrieved 26 June 2018.
- El-Akkawi, AI; Joanroy, R; Barfod, KW; Kallemose, T; Kristensen, SS; Viberg, B (March 2018). "Effect of Early Versus Late Weightbearing in Conservatively Treated Acute Achilles Tendon Rupture: A Meta-Analysis". The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons. 57 (2): 346–352. doi:10.1053/j.jfas.2017.06.006. PMID 28974345.
- van der Eng, DM; Schepers, T; Goslings, JC; Schep, NW (2012). "Rerupture rate after early weightbearing in operative versus conservative treatment of Achilles tendon ruptures: a meta-analysis". The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons. 52 (5): 622–8. doi:10.1053/j.jfas.2013.03.027. PMID 23659914.
- Maffulli, N; Ajis, A (June 2008). "Management of chronic ruptures of the Achilles tendon". The Journal of Bone and Joint Surgery. American Volume. 90 (6): 1348–60. doi:10.2106/JBJS.G.01241. PMID 18519331.
- Longo, D; Fauci, A; Kasper, D; Hauser, S; Jameson, J; Loscalzo, J (2012). Harrison's Principles of Internal Medicine (18th ed.). New York: McGraw-Hill. p. 3149. ISBN 978-0071748896.
- Talley, Nicholas J.; O'Connor, Simon (2013). Clinical Examination: A Systematic Guide to Physical Diagnosis (7th ed.). p. 453. ISBN 9780729541985.
- Sellers WI, Pataky TC, Caravaggi P, Crompton RH. (2010). Evolutionary Robotic Approaches in Primate Gait Analysis. Int J Primatol 31:321–338 doi:10.1007/s10764-010-9396-4
- Lichtwark, GA; Wilson, AM (2005). "In vivo mechanical properties of the human Achilles tendon during one-legged hopping". The Journal of Experimental Biology. 208 (Pt 24): 4715–25. doi:10.1242/jeb.01950. PMID 16326953.
- Veheyen, Philip (1693), Corporis humani anatomia, Leuven: Aegidium Denique, p. 269, retrieved 12 Mar 2018,
Vocatum passim chorda Achillis, & ab Hippocrate tendo magnus. (Appendix, caput XII. De musculis pedii et antipedii, p. 269)
- Klenerman, L. (April 2007). "The early history of tendo Achillis and its rupture". The Journal of Bone and Joint Surgery. British Volume. 89-B (4): 545–547. doi:10.1302/0301-620X.89B4.18978. PMID 17463129.