WordNet

shoot a marble while keeping ones knuckles on the ground
a joint of a finger when the fist is closed (同)knuckle_joint, metacarpophalangeal_joint
press or rub with the knuckles
a baseball pitch thrown with little speed or spin (同)knuckler
a joint allowing movement in one plane only (同)hinge_joint

PrepTutorEJDIC

指のつけ根の関節 / (四つ足獣の)ひざ肉 / …‘を'げんこで打つ,指の関節ではじく / いっしょうけんめいにやる《+down》;(…に)精を出す《+『down to』+『名』》 / (…に)屈服する《+『under』+『名』》
指関節の骨

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/05/30 18:38:27」(JST)

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The major knuckles of the hand

The knuckles are the joints of the fingers which are brought into prominence when the hand is clenched and a fist is made. The word is cognate to similar words in other Germanic languages, such as the Dutch "Knokkel" (knuckle) or German "Knöchel" (ankle), i.e., Knöchlein, the diminutive of the German word for bone (Knochen). Anatomically, it is said that the knuckles consist of the metacarpophalangeal^[1] (MCP) and interphalangeal (IP) joints of the finger. The knuckles at the base of the fingers may be referred to as the 1st^[1] or major knuckles while the knuckles at the midfinger are known as the 2nd^[2] and 3rd, or minor, knuckles. However, the ordinal terms are used inconsistently, and can be found referring to any of the knuckles.^[3]^[4]

The physical mechanism behind the popping or cracking sound heard when cracking joints such as knuckles is still uncertain, although it is widely believed to be caused by synovial fluid filling the vacuum left by the joint's displacement.^[5]^[6]

Gallery

Clenched fist with knuckles (encircled in red) and a skull ring
Motorcycle racing gloves with titanium knuckle protectors

References

^ ^a ^b Utah Mountain Biking; Thumb Sprain; First as metacarpo.
^ Second knuckle as thumb's interphalangeal, "anchor knuckle" as metacarpophalangeal
^ First knuckle as thumb's interphalangeal
^ First knuckle as distal interphalangeal
^ John Hopkins Arthritis Center, Knuckle Cracking and Arthritis
^ Brodeur R. (1995). "The audible release associated with joint manipulation.". J Manipulative Physiol Ther 18 (3): 155–64. PMID 7790795.

This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). Encyclopædia Britannica (11th ed.). Cambridge University Press.

This anatomy article is a stub. You can help Wikipedia by expanding it.

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