Editing Scaphoid bone (section)

==Clinical significance==

===Fracture===
{{main|Scaphoid fracture}}
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[[Scaphoid fracture|Fractures of the scaphoid]] are the most common of the carpal bone injuries, because of its connections with the two rows of carpal bones.<ref name=BEASLEY2003 />{{rp|177}}

The scaphoid can be slow to heal because of the limited circulation to the [[bone]]. Fractures of the scaphoid must be recognized and treated quickly, as prompt treatment by immobilization or surgical fixation increases the likelihood of the bone healing in anatomic alignment, thus avoiding mal-union or non-union.<ref name=":0">{{cite journal | vauthors = Wijetunga AR, Tsang VH, Giuffre B | title = The utility of cross-sectional imaging in the management of suspected scaphoid fractures | journal = Journal of Medical Radiation Sciences | volume = 66 | issue = 1 | pages = 30–37 | date = March 2019 | pmid = 30160062 | pmc = 6399186 | doi = 10.1002/jmrs.302 }}</ref> Delays may compromise healing. Failure of the fracture to heal ("non-union") will lead to post-traumatic [[osteoarthritis]] of the carpus.<ref name=BEASLEY2003 />{{rp|189}} One reason for this is because of the "tenuous" blood supply to the proximal segment.<ref name=EATHORNE2005 /> Even rapidly immobilized fractures may require surgical treatment, including use of a headless compression screw such as the [[Herbert screw]] to bind the two halves together.

Healing of the fracture with a non-anatomic deformity (frequently, a volar flexed "humpback") can also lead to [[post-traumatic arthritis]].  Non-unions can result in loss of blood supply to the proximal pole, which can result in [[avascular necrosis]] of the proximal segment.

Scaphoid fractures may be difficult to diagnose via plain x-ray. A repeat x-ray may be required at a later date, as might cross-sectional imaging via MRI or CT scan.<ref name=":0" />

===Other diseases===
A condition called [[scapholunate instability]] can occur when the [[scapholunate ligament]] (connecting the scaphoid to the [[lunate bone]]) and other surrounding ligaments are disrupted. In this state, the distance between the scaphoid and [[lunate]] bones is increased.<ref name=BEASLEY2003 />{{rp|180}}

One rare disease of the scaphoid is called [[Preiser disease|Preiser's Disease]].

===Palpation===
The scaphoid can be [[palpation|palpated]] at the base of the [[anatomical snuff box]]. It can also be palpated in the volar (palmar) hand/wrist.  Its position is the intersections of the long axes of the four fingers while in a fist, or the base of the [[thenar eminence]].  When palpated in this position, the bone will be felt to slide forward during radial deviation (wrist abduction) and flexion.

Clicking of the scaphoid or no anterior translation can indicate scapholunate instability.