Navicular bone

For the bone in the wrist/hand formerly called navicular, see scaphoid bone
Bone: Navicular bone
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The left navicular. Antero-lateral view
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The left navicular. Postero-medial view.
Latin os naviculare
Gray's subject #63 270

The navicular bone is a small bone found in the feet of both humans and horses.

Contents

Human anatomy

The navicular bone is one of the tarsal bones, found in the foot. Its name derives from the bone's resemblance to a small boat, caused by the strongly concave proximal articular surface. The term navicular bone or hand navicular bone was formerly used[1] for the scaphoid bone, one of the carpal bones of the wrist.

It is located on the medial side of the foot, and articulates proximally with the talus, distally with the three cuneiform bones, and occasionally laterally with the cuboid.

As the bones in the foot develop, a particular process is important for the navicular structure. In the early stage, the navicular bone is actually cartilaginous and has to progress and calcify in order to maintain a strong form. There is a condition, however, in which the three cuneiforms that compose the bone do not completely calcify as a unit. In other words, they do not fuse properly, which leads to the most medial third creating a protrusion along the medial arch. This extension of the foot has a tendency to put stress on two tendons and the ligament that run along its side. The tendon of the peroneus brevis muscle which is the most distal of the two tendons, the tendon of the peroneus longus muscle which extends to the posterior of the ankle, and the posterior talofibular ligament which extends upward partway along the calf muscle, can all be potentially affected by this protrusion. Sometimes referred to as an extra navicular bone, this bump can cause wear and tear on the tendons causing sharp pain with increased activity. This condition can be corrected with surgery to file down or remove the protrusion and repair the tendons that were affected.[2]

Horse anatomy

The navicular bone of the horse, also known as the distal sesamoid bone, lies on the palmar aspect of the coffin joint between the second phalanx and third phalanx, known as the coffin or pedal bone. It is an important structure in relation to lameness and is involved with a significant disease process called Navicular Disease. Recently much of the original literature concerning navicular disease has been called into question, particularly the significance of some radiographic changes.[3]

Notes

  1. ^ "Gray's Anatomy, 6b. The Hand. 1. The Carpus. 4". 1918. http://www.bartleby.com/107/54.html. Retrieved December 2009. 
  2. ^ Wexler, Randell K., M.D. “The Injured Ankle.” American Academy of Family Physicians. 1998 Vol. 57 No. 3. <http://www.aafp.org/afp/980201ap/wexler.html>
  3. ^ Citing Clinical Anatomy and Physiology Laboratory Manual for Veterinary Technicians, Colville, Thomas and Bassert, Joanna M. 2008 Publ. Mosby/Elsevier, Canada. "Navicular Bone - The distal sesamoid bone of the horse. The navicular bone is located deep in the hoof behind the joint between the middle and distal phalanges."

See also

Additional images


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Look at other dictionaries:

  • Navicular bone — Navicular Na*vic u*lar, a. [L. navicularius, fr. navicula, dim. of navis ship: cf. F. naviculaire.] 1. Of, pertaining to, or resembling, a boat or ship. [1913 Webster] 2. Shaped like a boat; cymbiform; scaphoid; as, the navicular glumes of most… …   The Collaborative International Dictionary of English

  • navicular bone — noun 1. A boat shaped bone on the thumb side of the wrist joint, the scaphoid bone 2. A corresponding bone in the ankle joint • • • Main Entry: ↑navicula …   Useful english dictionary

  • navicular bone — a boat shaped bone of the ankle (see tarsus) that articulates with the three cuneiform bones in front and with the talus behind …   Medical dictionary

  • navicular bone — a boat shaped bone of the ankle (see tarsus) that articulates with the three cuneiform bones in front and with the talus behind …   The new mediacal dictionary

  • navicular bone — noun One of the tarsal bones of the foot or one of the carpal bones of the wrist. Syn: scaphoid …   Wiktionary

  • navicular bone of foot — os naviculare …   Medical dictionary

  • navicular bone of hand — os scaphoideum …   Medical dictionary

  • Accessory navicular bone — An accessory navicular bone is a bone of the foot that occasionally develops abnormally in front of the ankle towards the inside of the foot. This bone may be present in approximately 2.5% of the general population and is usually asymptomatic.… …   Wikipedia

  • Кость Ладьевидная (Navicular Bone) — похожая на ладью кость предплюсны; соединяется спереди с тремя клиновидными костями, сзади с таранной костью, а с латеральной стороны с кубовидной костью. Источник: Медицинский словарь …   Медицинские термины

  • Navicular Disease — is a soundness problem in horses, more accurately called navicular syndrome as opposed to disease. It most commonly describes an inflammation or degeneration of the navicular bone and its surrounding tissues, usually on the front feet. It can… …   Wikipedia

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