The Wrist Joint - Computational Biomechanics of the Wrist Joint - page 11

Table 1.2 Wrist range of

Wrist motion Range of motion

motion

Flexion: 65-80 o
Extension: 55-75 o

Flexion-extension [ 28 ]

Radial deviation: 15-25 o
Ulnar deviation: 30-45 o

Radial-ulnar deviation [ 26 , 27 ]

Pronation: 60-80 o
Supination: 60-85 o

Forearm
pronation-supination [ 28 ]

migration of the hamate. This motion leads to the extension of the lunate. Fig-
ure 1.6 illustrates the images of reconstructed wrist motions during an in vivo
study.
Largely, the three motions were dictated by a double-V system, where the
proximal V consisted of the radiolunate (lateral arm of the proximal) and the
ulnolunate (medial arm of the proximal) ligaments. The mechanisms for each
motion are as depicted in Fig. 1.7 [ 28 ].
Forearm pronation and supination motions were mainly occurred at the elbow
joint, despite small motions also observed at the wrist joint. Average values for
range of motion have been identified, where a range of 60-80 o found during
pronation and 60-85 o during supination (150 o arc of motion). The axis for these
motions lies obliquely passing through the center of the humeral capitulum and the
midpoint of the head of ulna [ 27 , 28 ] (Table 1.2 ).

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