Ankle
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2008-07-15T13:00:19Z
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robot Adding: [[ca:Turmell]], [[cs:Kotník]]
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{{Infobox Anatomy |
Name = ankle |
Latin = articulatio talocruralis |
GraySubject = 95 |
GrayPage = 349 |
Image = Ankle en.svg |
Caption = Lateral view of the human ankle |
Image2 = |
Caption2 = |
Precursor = |
System = |
Artery = |
Vein = |
Nerve = |
Lymph = |
MeshName = Ankle+joint |
MeshNumber = A02.835.583.378.062 |
DorlandsPre = a_64 |
DorlandsSuf = 12161605 |
}}
In [[human anatomy]], the '''ankle''' [[joint]] is formed where the [[foot]] and the [[human leg|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.<ref name="titleeMedicine1">{{cite web |url=http://www.emedicine.com/asp/dictionary.asp?keyword=Ankle+joint |title=eMedicine/Stedman Medical Dictionary Lookup! |accessdate=2008-01-14 |format= |work=}}</ref> The articulation between the tibia and the talus bears more weight than between the smaller fibula and the talus.
The term "ankle" is used to describe structures in the region of the ankle joint proper.<ref name="titleeMedicine2">{{cite web |url=http://www.emedicine.com/asp/dictionary.asp?keyword=Ankle |title=eMedicine/Stedman Medical Dictionary Lookup! |accessdate=2008-01-14 |format= |work=}}</ref>
==Movement==
The ankle joint is responsible for [[dorsiflexion]] (moving the toes up as when standing only on the heels) and [[plantar flexion]] of the foot (moving the toes down, as when standing on the toes), and allows for the greatest movement of all the joints in the foot. The ankle does not allow rotation.
In plantar flexion, the anterior [[ligament]]s of the joint become longer while the posterior ligaments become shorter. The reverse is true for dorsiflexion.'''
==Articulation==
The [[lateral malleolus]] of the fibula and the [[medial malleolus]] of the tibia along with the inferior surface of the [[distal tibia]] articulate with three facets of the talus. These surfaces are covered by [[cartilage]].
The anterior talus is wider than the posterior talus. When the foot is dorsiflexed , the wider part of the superior talus moves into the articulating surfaces of the tibia and fibula, creating a more stable joint than when the foot is plantar flexed.
==Ligaments==
The ankle joint is bound by the strong [[deltoid ligament]] and three lateral ligaments: the [[anterior talofibular ligament]], the [[posterior talofibular ligament]], and the [[calcaneofibular ligament]].
* The ''deltoid ligament'' supports the medial side of the joint, and is attached at the [[medial malleolus]] of the tibia and connect in four places to the [[sustentaculum tali]] of the [[calcaneus]], [[calcaneonavicular ligament]], the [[navicular tuberosity]], and to the medial surface of the talus.
* The ''anterior'' and ''posterior talofibular ligaments'' support the lateral side of the joint from the [[lateral malleolus]] of the fibula to the dorsal and ventral ends of the talus.
* The ''calcaneofibular ligament'' is attached at the lateral malleolus and to the lateral surface of the calcaneus.
The joint is most stable in dorsiflexion and a [[sprained ankle]] is more likely to occur when the foot is plantar flexed. This type of injury more frequently occurs at the anterior talofibular ligament.
==Name derivation==
The word ankle or ancle is common, in various forms, to [[Germanic languages]], probably connected in origin with the [[Latin language|Latin]] "angulus", or [[Greek language|Greek]] "αγκυλος", meaning bent.
==Related terms==
A common variant of the word "ankle" is "[[cankle]]", which is commonly used derogatorily to describe the ankles of [[obesity|obese]] individuals where the ankle and calf may be indistinguishable. This insult can be taken further (often jokingly) using the term "thankle", which implies a person's thighs and ankles are indistinguishable.
==Fractures==
[[Image:Bimalleolar fracture legend.jpg|right|thumb|300px|Bimalleolar fracture and right ankle dislocation on X-ray (anteroposterior). Both the end of the fibula (1) and the tibia (2) are broken and the malleolar fragments (arrow: medial malleolus, arrowhead: lateral malleolus) are displaced.]]
Most [[Physical trauma|traumatic]] incidents involving the ankle result in [[ankle sprain]]s. [[Symptom]]s of an ankle [[fracture (bone)|fracture]] can be similar than for sprains ([[pain]], [[hematoma]]) or there may be an abnormal position, abnormal movement or lack of movement (if there is an accompanying [[Joint dislocation|dislocation]]), or the patient may have heard a crack.
On [[clinical examination]], it is important to evaluate the exact location of the pain, the [[range of motion]] and the condition of the nerves and vessels. It is important to [[palpation|palpate]] the calf bone ([[fibula]]) because there may be an associated fracture proximally, and to palpate the sole of the foot to look for a [[Jones fracture]] or the base of fifth metacarpal fracture (avulsion fracture)
Evaluation of ankle injuries for fracture is done with the [[Ottawa ankle rules]], a set of rules that were developed to minimize unnecessary [[X-rays]]. On X-rays, there can be a fracture of the [[medial malleolus]], the [[lateral malleolus]], or the anterior or posterior margin. If both malleoli are broken, this is called a [[bimalleolar fracture]] (some of them are called [[Pott's fracture]]s). If three of these are broken at the same time, this is called a [[trimalleolar fracture]] (although there are only two malleoli). Ankle fractures are classified according to Weber, depending on their position relative to the [[anterior ligament of the lateral malleolus]] (type A = below the ligament, type B = at its level, type C = above the ligament). A special form of type C fracture is the [[Maisonneuve fracture]], which involves a spiral fracture of the fibula with a tear of the distal tibiofibular [[syndesmosis]] and the [[interosseous membrane]].
Only type A fractures of the lateral malleolus can be treated like sprains; all other types require surgery (most often an [[Open reduction internal fixation|open reduction and internal fixation]]). A [[orthopedic cast|cast]] may be required to immobilize the ankle following surgery. [[Trimalleolar fracture]]s or those with dislocation have a high risk of developing [[arthrosis]].
==Additional images==
<gallery>
Image:Foot_bones.jpg|The bones in the foot
Image:Gray354.png|Ligaments of the medial aspect of the foot.
Image:Gray355.png|The ligaments of the foot from the lateral aspect.
Image:Gray356.png|Capsule of left talocrura articulation (distended). Lateral aspect.
Image:Gray360.png|Oblique section of left intertarsal and tarsometatarsal articulations, showing the synovial cavities.
</gallery>
==References==
<references/>
* Calais-Germain, Blandine. "Anatomy of Movement", Eastland Press, 1993. ISBN 0-939616-17-3
* Martini, Frederic; Timmons, Michael; McKinnley, Michael. "Human Anatomy", 3rd Edition, Prentice-Hall, 2000. ISBN 0-13-010011-0
* Marieb, Elaine. "Essentials of Human Anatomy and Physiology", 6th Edition. Addison Wesley Longman, 2000. ISBN 0-8053-4940-5
==See also==
{{wiktionary}}
*[[Tarsus (skeleton)]]
*[[Joints (anatomy)]]
*[[Foot]]
*[[Leg (anatomy)]]
==External links==
{{commonscat|Ankle}}
* [http://www.gla.ac.uk/ibls/US/fab/tutorial/anatomy/anklet.html The Ankle] from the [[University of Glasgow]]
* [http://www.podiatrytoday.com/article/4627 How to Diagnose Lateral Ankle Injuries from ''Podiatry Today'']
* [http://orthoinfo.aaos.org/menus/foot.cfm American Academy of Orthopedic Surgeons website about Foot & Ankle]
* [http://www.mybadfeet.com/Ankle_Fracture_Surgery_Education.php Ankle Fracture Surgery Edcucational Video]
* [http://www.mybadfeet.com/Fracture_of_the_Talus_Education.php Talar Fracture Video]
{{Joints of lower limbs}}
{{human anatomical features}}
[[Category:Foot]]
[[Category:Joints]]
[[Category:Pelvic limb anatomy]]
[[ar:كاحل]]
[[ay:Cayumoqo]]
[[ca:Turmell]]
[[cs:Kotník]]
[[de:Knöchel]]
[[es:Tobillo]]
[[eo:Maleolo]]
[[fr:Cheville (anatomie)]]
[[gd:Adhbrann]]
[[hi:टखना]]
[[it:Caviglia]]
[[he:קרסול]]
[[lb:Enkel (Anatomie)]]
[[nl:Enkel]]
[[ja:足関節]]
[[no:Ankelledd]]
[[pl:Staw skokowy górny]]
[[pt:Tornozelo]]
[[scn:Cavigghia]]
[[simple:Ankle]]
[[fi:Nilkka]]
[[sv:Vrist]]
[[tl:Bukung-bukong]]
[[tr:Ayak bileği]]
[[uk:Кісточка]]
[[fiu-vro:Jalajakk]]
[[zh:腳踝]]