Knuckle

 ( Fingers ) 

The knuckles are the of the . 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 language word for bone ( Knochen). Anatomically, it is said that the knuckles consist of the metacarpophalangealUtah Mountain Biking; Thumb Sprain; First as metacarpo. (MCP) and interphalangeal (IP) joints of the finger. The knuckles at the base of the fingers may be referred to as the 1st or major knuckles while the knuckles at the midfinger are known as the 2nd Second knuckle as thumb's interphalangeal, "anchor knuckle" as metacarpophalangeal and 3rd, or minor, knuckles. However, the Ordinal number terms are used inconsistently and may refer to any of the knuckles. First knuckle as thumb's interphalangeal

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Cracking The physical mechanism behind the popping or cracking sound heard when cracking joints such as knuckles was elucidated in 2015 by cine MRI to be caused by tribonucleation as a gas bubble forms in the /ref> Despite this evidence, many still believe it to be caused by synovial fluid filling the vacuum left by the joint's displacement.Johns Hopkins Arthritis Center, Knuckle Cracking and Arthritis In 2009, Donald L Unger was awarded the Ig Nobel for Medicine Ig Nobel Prize Winners for 2009 for his informal experiment with knuckle cracking. For 50 years, he cracked the knuckles of one hand while not cracking the knuckles of the other during that time. He self-reported no issues with arthritis on either hand. Does knuckle cracking lead to arthritis of the fingers?

== Gallery ==

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See also

• Metatarsophalangeal joints, also informally known as toe knuckles, the equivalent joints in the toes.
• Metacarpophalangeal joint

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