Trapezoid bone - Revision history

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	~~{{short description\|~~Bone ~~of the human wrist}}~~		== Trapezoid Bone ==
	~~{{Use dmy dates\|date~~=~~October 2023}}~~

	~~The '''trapezoid bone''', also known as the '''lesser multangular bone''', is one of the eight [[carpal bones]] of the~~ [[~~wrist]]~~. ~~It is located in the distal row~~ of ~~carpal bones and is~~ the ~~smallest~~ bone in ~~this row. The trapezoid bone is situated between the [[trapezium bone]] and the [[capitate bone]], and it articulates with~~ the ~~[[second metacarpal bone~~]].		[[File:Trapezoid_bone_(left_hand)_01_palmar_view.png\|Palmar view of the trapezoid bone in the left hand\|thumb\|right]]

	~~==Structure==~~		The '''trapezoid bone''', also known as the '''os trapezoideum''', is one of the eight [[carpal bones]] in the human [[wrist]]. It is situated in the distal row of the carpal bones and is the smallest bone in this row. The trapezoid bone plays a crucial role in the complex movements of the wrist and hand, contributing to the dexterity and functionality of the human hand.
	The trapezoid bone is ~~wedge-shaped and has four articular surfaces. The superior surface is concave and articulates with~~ the [[~~scaphoid bone~~]]. ~~The inferior surface~~ is ~~convex and articulates with~~ the ~~base~~ of the ~~second metacarpal~~ bone. The ~~lateral surface articulates with~~ the ~~trapezium bone~~, and the ~~medial surface articulates with the capitate bone~~.

	~~The dorsal and palmar surfaces of the trapezoid bone are rough for the attachment of ligaments. The bone is surrounded by a fibrous capsule that is part of the [[wrist joint]] complex.~~		== Anatomy ==

	~~==Function==~~		[[File:Gray226.png\|Illustration showing the position of the trapezoid bone\|thumb\|left]]
	~~The trapezoid bone plays a crucial role in the stability and movement of the wrist~~. ~~It helps to form~~ the ~~carpal arch, which is important for the passage~~ of ~~tendons and~~ the ~~[[median nerve]] through the [[carpal tunnel~~]]~~. The articulation with the second metacarpal bone allows for the movement of the index finger.~~

	~~==Clinical significance==~~		The trapezoid bone is located between the [[trapezium bone]] laterally and the [[capitate bone]] medially. It articulates with four bones: the second [[metacarpal bone]], the trapezium, the capitate, and the [[scaphoid bone]]. The trapezoid bone is characterized by its wedge shape, with the broader end facing dorsally and the narrower end facing palmarly.
	~~Injuries to the~~ trapezoid bone ~~are rare but can occur due to trauma or repetitive stress. Fractures of~~ the ~~trapezoid~~ bone ~~can lead to pain~~ and ~~limited movement in~~ the ~~wrist~~. ~~Diagnosis is typically made through~~ [[~~X-ray~~]] or [[~~MRI~~]] ~~imaging~~.

	==~~Gallery~~==		=== Surfaces ===
	~~<gallery>~~
	~~File~~:~~Trapezoid_bone_(left_hand)_01_palmar_view~~.~~png\|~~Palmar ~~view of~~ the trapezoid bone in the ~~left~~ hand		The trapezoid bone has six surfaces:
	~~File:Gray226~~.~~png\|Illustration showing~~ the ~~position~~ of the trapezoid bone
	File:Trapezoid_bone_(left_hand)_-_animation01.gif\|Animation of the trapezoid bone in the left hand		* '''Dorsal surface''': This surface is rough and provides attachment for ligaments.
	File:Trapezoid_bone_(left_hand)_-_animation02.gif\|Another animation of the trapezoid bone in the left hand		* '''Palmar surface''': Also rough, it serves as an attachment point for ligaments.
	File:Trapezoid_bone.jpg\|Image of the trapezoid bone		* '''Lateral surface''': Articulates with the trapezium.
	File:RightHumanPosteriorDistalRadiusUlnaCarpals_-_Trapezoid_bone.png\|Posterior view of the trapezoid bone		* '''Medial surface''': Articulates with the capitate.
	File:Gray220_-_Trapezoid_bone.png\|Diagram showing the trapezoid bone		* '''Proximal surface''': Articulates with the scaphoid.
	File:Gray219_-_Trapezoid_bone.png\|Lateral view of the trapezoid bone		* '''Distal surface''': Articulates with the second metacarpal.
	~~File:Gray422_-_Trapezoid_bone.png~~\|~~Detailed illustration of the trapezoid bone~~
	~~File:Ospoignet_-_Trapezoid_bone.png\|Anatomical drawing of the trapezoid bone~~		== Function ==
	~~</gallery>~~
			The trapezoid bone is integral to the stability and movement of the wrist. It helps in the transmission of forces from the hand to the forearm and allows for the intricate movements necessary for gripping and manipulating objects. The articulation with the second metacarpal is particularly important for the precision grip.

			== Development ==

			The trapezoid bone ossifies from a single center, which appears between the ages of 4 and 6 years. This ossification process is part of the normal development of the carpal bones, which typically complete ossification by late adolescence.

			== Clinical Significance ==

			Injuries to the trapezoid bone are rare due to its protected position within the carpal bones. However, fractures can occur, often as a result of direct trauma or severe wrist injuries. Such fractures may require immobilization or surgical intervention depending on the severity.

			== Images ==

			[[File:Trapezoid_bone_(left_hand)_-_animation01.gif\|Animation of the trapezoid bone in the left hand\|thumb\|right]]
			[[File:Trapezoid_bone_(left_hand)_-_animation02.gif\|Another animation of the trapezoid bone in the left hand\|thumb\|left]]
			[[File:Trapezoid_bone.jpg\|Image of the trapezoid bone\|thumb\|right]]
			[[File:RightHumanPosteriorDistalRadiusUlnaCarpals_-_Trapezoid_bone.png\|Posterior view of the trapezoid bone\|thumb\|left]]
			[[File:Gray220_-_Trapezoid_bone.png\|Diagram showing the trapezoid bone\|thumb\|right]]
			[[File:Gray219_-_Trapezoid_bone.png\|Lateral view of the trapezoid bone\|thumb\|left]]

			== Related Pages ==

	~~==Related pages==~~
	* [[Carpal bones]]		* [[Carpal bones]]
	* [[Wrist joint]]
	* [[Trapezium bone]]		* [[Trapezium bone]]
	* [[Capitate bone]]		* [[Capitate bone]]
			* [[Scaphoid bone]]
	~~==References==~~		* [[Metacarpal bones]]
	~~{{Reflist}}~~

	[[Category:Carpal bones]]		[[Category:Carpal bones]]
	~~<gallery>~~
	~~File:Trapezoid_bone_(left_hand)_01_palmar_view.png\|Trapezoid bone~~
	~~File:Gray226.png\|Trapezoid bone~~
	~~File:Trapezoid_bone_(left_hand)_-_animation01.gif\|Trapezoid bone~~
	~~File:Trapezoid_bone_(left_hand)_-_animation02.gif\|Trapezoid bone~~
	~~File:Trapezoid_bone.jpg\|Trapezoid bone~~
	~~File:RightHumanPosteriorDistalRadiusUlnaCarpals_-_Trapezoid_bone.png\|Trapezoid bone~~
	~~File:Gray220_-_Trapezoid_bone.png\|Trapezoid bone~~
	~~File:Gray219_-_Trapezoid_bone.png\|Trapezoid bone~~
	~~File:Gray422_-_Trapezoid_bone.png\|Trapezoid bone~~
	~~File:Ospoignet_-_Trapezoid_bone.png\|Trapezoid bone~~
	~~</gallery>~~

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2025-02-18T11:49:58Z

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	[[Category:Carpal bones]]		[[Category:Carpal bones]]
			<gallery>
			File:Trapezoid_bone_(left_hand)_01_palmar_view.png\|Trapezoid bone
			File:Gray226.png\|Trapezoid bone
			File:Trapezoid_bone_(left_hand)_-_animation01.gif\|Trapezoid bone
			File:Trapezoid_bone_(left_hand)_-_animation02.gif\|Trapezoid bone
			File:Trapezoid_bone.jpg\|Trapezoid bone
			File:RightHumanPosteriorDistalRadiusUlnaCarpals_-_Trapezoid_bone.png\|Trapezoid bone
			File:Gray220_-_Trapezoid_bone.png\|Trapezoid bone
			File:Gray219_-_Trapezoid_bone.png\|Trapezoid bone
			File:Gray422_-_Trapezoid_bone.png\|Trapezoid bone
			File:Ospoignet_-_Trapezoid_bone.png\|Trapezoid bone
			</gallery>

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2025-02-10T00:36:09Z

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← Older revision		Revision as of 00:36, 10 February 2025
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	~~'''Trapezoid bone'''~~		{{short description\|Bone of the human wrist}}
			{{Use dmy dates\|date=October 2023}}

	The '''~~Trapezoid~~ bone''' is one of the eight [[carpal bones]] of the [[~~hand~~]]. It is located in the distal row of the ~~carpus,~~ between the [[trapezium (bone~~)\|trapezium~~]] and the [[capitate bone]]~~. The trapezoid bone is~~ the ~~smallest~~ bone ~~in the distal row. It may be distinguished by its wedge-like form~~.		The '''trapezoid bone''', also known as the '''lesser multangular bone''', is one of the eight [[carpal bones]] of the [[wrist]]. It is located in the distal row of carpal bones and is the smallest bone in this row. The trapezoid bone is situated between the [[trapezium bone]] and the [[capitate bone]], and it articulates with the [[second metacarpal bone]].

	==Structure==		==Structure==
	The trapezoid bone is wedge-shaped, and has four surfaces. It is ~~located between~~ the ~~trapezium~~ and the ~~capitate in the distal row~~ of the ~~carpal bones~~. The ~~trapezoid is distinguished by a deep groove on its palmar~~ surface~~. It is~~ the ~~least often fractured of~~ the ~~carpal bones~~.		The trapezoid bone is wedge-shaped and has four articular surfaces. The superior surface is concave and articulates with the [[scaphoid bone]]. The inferior surface is convex and articulates with the base of the second metacarpal bone. The lateral surface articulates with the trapezium bone, and the medial surface articulates with the capitate bone.

	~~===Surfaces===~~		The dorsal and palmar surfaces of the trapezoid bone are rough for the attachment of ligaments. The bone is surrounded by a fibrous capsule that is part of the [[wrist joint]] complex.
	The ~~trapezoid has four~~ surfaces~~: superior, inferior, lateral, and medial.~~

	* The superior surface is quadrilateral and slightly concave. It articulates with the ~~[[scaphoid~~ bone]].
	* The ~~inferior surface articulates with the proximal~~ part of the [[~~second metacarpal bone~~]].
	* The lateral surface, convex and smooth, articulates with the trapezium.
	* The medial surface, concave and smooth, articulates with the capitate.

	==Function==		==Function==
	The trapezoid bone ~~contributes~~ to the ~~conformation~~ of the [[~~carpal tunnel~~]] ~~and~~ the [[carpal ~~arch~~]].		The trapezoid bone plays a crucial role in the stability and movement of the wrist. It helps to form the carpal arch, which is important for the passage of tendons and the [[median nerve]] through the [[carpal tunnel]]. The articulation with the second metacarpal bone allows for the movement of the index finger.

	==Clinical significance==		==Clinical significance==
	Injuries to the trapezoid are rare. ~~When they do occur, they are often associated with fractures~~ of ~~other carpal bones~~.		Injuries to the trapezoid bone are rare but can occur due to trauma or repetitive stress. Fractures of the trapezoid bone can lead to pain and limited movement in the wrist. Diagnosis is typically made through [[X-ray]] or [[MRI]] imaging.

			==Gallery==
			<gallery>
			File:Trapezoid_bone_(left_hand)_01_palmar_view.png\|Palmar view of the trapezoid bone in the left hand
			File:Gray226.png\|Illustration showing the position of the trapezoid bone
			File:Trapezoid_bone_(left_hand)_-_animation01.gif\|Animation of the trapezoid bone in the left hand
			File:Trapezoid_bone_(left_hand)_-_animation02.gif\|Another animation of the trapezoid bone in the left hand
			File:Trapezoid_bone.jpg\|Image of the trapezoid bone
			File:RightHumanPosteriorDistalRadiusUlnaCarpals_-_Trapezoid_bone.png\|Posterior view of the trapezoid bone
			File:Gray220_-_Trapezoid_bone.png\|Diagram showing the trapezoid bone
			File:Gray219_-_Trapezoid_bone.png\|Lateral view of the trapezoid bone
			File:Gray422_-_Trapezoid_bone.png\|Detailed illustration of the trapezoid bone
			File:Ospoignet_-_Trapezoid_bone.png\|Anatomical drawing of the trapezoid bone
			</gallery>

	==~~See also~~==		==Related pages==
	* [[Carpal bones]]		* [[Carpal bones]]
	* [[~~Hand]]~~		* [[Wrist joint]]
	* [[Scaphoid bone]]		* [[Trapezium bone]]
	* [[Trapezium (bone)]]
	* [[Capitate bone]]		* [[Capitate bone]]

	==References==		==References==
	~~<references />~~		{{Reflist}}

	~~==External links==~~
	* [https://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0023122/ Trapezoid bone] at the US National Library of Medicine Medical Subject Headings (MeSH)

	~~[[Category:Hand]]~~
	~~[[Category:Bones of the upper limb]]~~
	[[Category:Carpal bones]]		[[Category:Carpal bones]]

	~~{{stub}}~~

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2024-02-25T17:14:48Z

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'''Trapezoid bone'''

The '''Trapezoid bone''' is one of the eight [[carpal bones]] of the [[hand]]. It is located in the distal row of the carpus, between the [[trapezium (bone)|trapezium]] and the [[capitate bone]]. The trapezoid bone is the smallest bone in the distal row. It may be distinguished by its wedge-like form.

==Structure==
The trapezoid bone is wedge-shaped, and has four surfaces. It is located between the trapezium and the capitate in the distal row of the carpal bones. The trapezoid is distinguished by a deep groove on its palmar surface. It is the least often fractured of the carpal bones.

===Surfaces===
The trapezoid has four surfaces: superior, inferior, lateral, and medial.

* The superior surface is quadrilateral and slightly concave. It articulates with the [[scaphoid bone]].
* The inferior surface articulates with the proximal part of the [[second metacarpal bone]].
* The lateral surface, convex and smooth, articulates with the trapezium.
* The medial surface, concave and smooth, articulates with the capitate.

==Function==
The trapezoid bone contributes to the conformation of the [[carpal tunnel]] and the [[carpal arch]].

==Clinical significance==
Injuries to the trapezoid are rare. When they do occur, they are often associated with fractures of other carpal bones.

==See also==
* [[Carpal bones]]
* [[Hand]]
* [[Scaphoid bone]]
* [[Trapezium (bone)]]
* [[Capitate bone]]

==References==
<references />

==External links==
* [https://www.ncbi.nlm.nih.gov/pubmedhealth/PMHT0023122/ Trapezoid bone] at the US National Library of Medicine Medical Subject Headings (MeSH)

[[Category:Hand]]
[[Category:Bones of the upper limb]]
[[Category:Carpal bones]]

{{stub}}

← Older revision		Revision as of 11:49, 18 February 2025
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	[[Category:Carpal bones]]		[[Category:Carpal bones]]
			<gallery>
			File:Trapezoid_bone_(left_hand)_01_palmar_view.png\|Trapezoid bone
			File:Gray226.png\|Trapezoid bone
			File:Trapezoid_bone_(left_hand)_-_animation01.gif\|Trapezoid bone
			File:Trapezoid_bone_(left_hand)_-_animation02.gif\|Trapezoid bone
			File:Trapezoid_bone.jpg\|Trapezoid bone
			File:RightHumanPosteriorDistalRadiusUlnaCarpals_-_Trapezoid_bone.png\|Trapezoid bone
			File:Gray220_-_Trapezoid_bone.png\|Trapezoid bone
			File:Gray219_-_Trapezoid_bone.png\|Trapezoid bone
			File:Gray422_-_Trapezoid_bone.png\|Trapezoid bone
			File:Ospoignet_-_Trapezoid_bone.png\|Trapezoid bone
			</gallery>