Dating a wrist fracture
In the hand proper a total of 13 bones form part of the wrist: eight carpal bones—scaphoid, lunate, triquetral, pisiform, trapezium, trapezoid, capitate, and hamate— and five metacarpal bones—the first, second, third, fourth, and fifth metacarpal bones.The midcarpal joint is the S-shaped joint space separating the proximal and distal rows of carpal bones.The proximal articular surface is made up of lower end of radius and triangular articular disc of the inferior radio-ulnar joint.On the other hand, the distal articular surface is made up of proximal surfaces of the scaphoid, triquetral and lunate bones.Ossification of the bones around the wrist is one indicator used in taking a bone age.The term 'wrist fracture' may be used to refer to fractures of the distal radius.
The parts forming the radiocarpal joint are the lower end of the radius and under surface of the articular disk above; and the scaphoid, lunate, and triquetral bones below.
The wr- sound of this base seems originally to have been symbolic of the action of twisting.
The carpal bones on the ulnar side only make intermittent contact with the proximal side — the triquetrum only makes contact during ulnar abduction.
The capsule, lax and un-branched, is thin on the dorsal side and can contain synovial folds.
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The English word "wrist" is etymologically derived from the ancient German word wristiz from which are derived modern German rist ("instep", "wrist") and modern Swedish vrist ("instep", "ankle").