Hamate bone

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Hamate bone
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Right hand anterior view (palmar view). Hamate bone shown in red.
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The right hamate bone; anterior aspect. (After Charpy.)
Details
Pronunciation/ˈheɪmət/
ArticulationsArticulates with five bones:
the lunate proximally
the fourth and fifth metacarpals distally
the triquetrum medially
the capitate laterally
Identifiers
Latinos hamatum
Anatomical terms of bone

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File:HamateRadiology.png
Hamate of the right hand as seen on X-ray (labeled H)

The hamate bone (from Latin Template:Wikt-lang, 'hooked'), or unciform bone (from Latin Template:Wikt-lang, 'hook'), Latin Script error: No such module "Lang". and occasionally abbreviated as just hamatum,[1][2][3] is a bone in the human wrist readily distinguishable by its wedge shape and a hook-like process ("hamulus") projecting from its palmar surface.

Structure

The hamate is an irregularly shaped carpal bone found within the hand. The hamate is found within the distal row of carpal bones, and abuts the metacarpals of the little finger and ring finger.[4]Template:Rp

Adjacent to the hamate on the ulnar side, and slightly proximal and ulnar to it, is the pisiform bone. Adjacent on the radial side is the capitate, and proximal is the lunate bone.[4]Template:Rp

Surfaces

The hamate bone has six surfaces:

  • The superior part, of the apex of the wedge, is narrow, convex, smooth, and articulates with the lunate.
  • The inferior articulates with the fourth and fifth metacarpal bones, by concave facets which are separated by a ridge.
  • The dorsal is triangular and rough for ligamentous attachment.
  • The palmar presents, at its lower and ulnar side, a curved, hook-like process, the hamulus, directed forward and laterally.
  • The medial articulates with the triangular bone by an oblong facet, cut obliquely from above, downward and medialward.
  • The lateral articulates with the capitate by its upper and posterior part, the remaining portion being rough, for the attachment of ligaments.

Hook

File:SpinningHamate.gif
Hamate bone of the right hand. Hook highlighted in red.

The hook of hamate (Template:Langx) is found at the proximal, ulnar side of the hamate bone. The hook is a curved, hook-like process that projects 1–2 mm distally and radially.[5] The ulnar nerve hooks around the hook of hamate as it crosses towards the medial side of hand.

The hook forms the ulnar border of the carpal tunnel, and the radial border for Guyon's canal. Numerous structures attach to it, including ligaments from the pisiform, the transverse carpal ligament, and the tendon of flexor carpi ulnaris.[5]

Its medial surface gives origin to the flexor digiti minimi brevis and opponens digiti minimi; its lateral side is grooved for the passage of the flexor tendons into the palm of the hand.

Development

The ossification of the hamate starts at the sixth month of life on average.[6] The said bone does not fully ossify until about the 15th year of life.[5]

Other animals

The bone is also found in many other mammals, and is homologous with the "fourth distal carpal" of reptiles and amphibians.

Function

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The carpal bones function as a unit to provide a bony superstructure for the hand.[4] It forms a concave palmar arch that helps create the carpal tunnel and acts as an attachment site for ligaments and muscles involved in grip and muscle control. The flexor retinaculum of the hand and muscles of the hypothenar eminence attach to the hook of the hamate, which helps to stabilize the ulnar border of the carpal tunnel and form Guyon's Canal.

Clinical significance

The hamate bone is the bone most commonly fractured when a golfer hits the ground hard with a golf club on the downswing or a hockey player hits the ice with a slap shot. The fracture is usually a hairline fracture, commonly missed on normal X-rays. Symptoms are pain aggravated by gripping, tenderness over the hamate and symptoms of irritation of the ulnar nerve. This is characterized by numbness and weakness of the fifth digit with partial involvement of the fourth digit as well, the "ulnar 1½ fingers".

The hook of hamate is particularly prone to fracture-related complications such as non-union due to its tenuous blood supply.[5]

It is also a common injury in baseball players. Several professional baseball players have had the bone removed during the course of their careers.[7][8][9][10][11][12] This condition has been called "Wilson's Wrist".[13]

The calcification of the hamate bone is seen on X-rays during puberty and is sometimes used in orthodontics to determine if an adolescent patient is suitable for orthognathic intervention (i.e. before or at their growth spurt).[citation needed]

Etymology

The etymology derives from the Latin hamatus "hooked," from hamus which means "hook".

Additional images

See also

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This article uses anatomical terminology.

References

Public domain This article incorporates text in the public domain from Template:Wikidatathe 20th edition of Gray's Anatomy (1918)

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  1. ^ Page Module:Citation/CS1/styles.css has no content.Gdoura, F.; Trigui, M.; Ellouze, Z.; Hamed, Y. B.; Ayadi, K.; Keskes, H. (October 2010). "Hamatum osteoblastoma". Orthopaedics & Traumatology, Surgery & Research. 96 (6): 712–716. doi:10.1016/j.otsr.2010.02.014. ISSN 1877-0568. PMID 20692218.
  2. ^ Page Module:Citation/CS1/styles.css has no content.Mei, Guo-Hua; Wang, Hai-Ming; Fan, Cun-Yi; Zhang, Chang-Qing; Zeng, Bing-Fang (October 2014). "Possibility of the hamatum carpometacarpal joint as a new joint donor site for interphalangeal joint restoration". European Journal of Orthopaedic Surgery & Traumatology: Orthopedie Traumatologie. 24 (7): 1175–1180. doi:10.1007/s00590-013-1300-4. ISSN 1633-8065. PMID 23982116. S2CID 25697262.
  3. ^ Page Module:Citation/CS1/styles.css has no content.Alp, Nazmi Bülent; Kaleli, Tufan; Kalay, Onur Can; Karpat, Fatih; Akdag, Gokhan; Macunluoglu, Aslı Ceren; Oral, Gamze Saygı (2020). "The Effect of Hamatum Curvature Angle on Carpal Tunnel Volumetry: A Mathematical Simulation Model". Computational and Mathematical Methods in Medicine. 2020 7582181. doi:10.1155/2020/7582181. ISSN 1748-6718. PMC 7312712. PMID 32617118.
  4. ^ a b c Page Module:Citation/CS1/styles.css has no content.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. ISBN 978-0-8089-2306-0.
  5. ^ a b c d Page Module:Citation/CS1/styles.css has no content.Eathorne, SW (March 2005). "The wrist: clinical anatomy and physical examination—an update". Primary Care. 32 (1): 17–33. doi:10.1016/j.pop.2004.11.009. PMID 15831311.
  6. ^ Page Module:Citation/CS1/styles.css has no content.Balachandran, Ajay; Kartha, Moumitha; Krishna, Anooj; Thomas, Jerry; K, Prathilash; TN, Prem; GK, Libu; B, Krishnan; John, Liza (2014). "A Study of Ossification of Capitate, Hamate, Triquetral & Lunate in Forensic Age Estimation". Indian Journal of Forensic Medicine & Toxicology. 8 (2): 218–224. doi:10.5958/0973-9130.2014.00720.8. ISSN 0973-9130. Retrieved 18 August 2014.
  7. ^ Page Module:Citation/CS1/styles.css has no content.Snow, Chris (June 1, 2006). "Peña to have surgery". The Boston Globe. Retrieved September 2, 2011.
  8. ^ Page Module:Citation/CS1/styles.css has no content.Manuel, John (March 31, 2004). "Wrist Troubles Drain Prospects' Power". Baseball America. Retrieved September 2, 2011.
  9. ^ Page Module:Citation/CS1/styles.css has no content.Benjamin, Amalie (July 27, 2007). "He's gaining in arms race". The Boston Globe. Retrieved September 2, 2011.
  10. ^ Page Module:Citation/CS1/styles.css has no content."Dickerson has hand, wrist surgery". ESPN. Associated Press. May 3, 2010. Retrieved September 2, 2011.
  11. ^ Page Module:Citation/CS1/styles.css has no content.Carobine, Kieran (March 8, 2011). "Domonic Brown's Surgery A Success". Phillies Nation. Retrieved September 2, 2011.
  12. ^ Page Module:Citation/CS1/styles.css has no content."Angels' Mike Trout: Undergoes hamate surgery". CBS Sports. July 5, 2023. Retrieved August 4, 2023.
  13. ^ WILSON JN. Profiles of the carpal canal. J Bone Joint Surg Am. 1954 Jan;36-A(1):127–132

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