Sennwald G R, Zdravkovic V, Jacob H A, Kern H P
Chirurgie St Leonhard, Clinic for Hand and Outpatient Surgery, St Gallen, Switzerland.
J Hand Surg Br. 1993 Oct;18(5):609-12. doi: 10.1016/0266-7681(93)90015-8.
The motions of the scaphoid and triquetrum relative to the lunate have been studied on cadaver specimens. The helical axis concept was applied. The wrist motions performed were flexion-extension and radial-ulnar deviation. The results showed increased relative motion of the scaphoid towards terminal extension, and to a lesser amount in the case of the triquetrum, towards terminal flexion. The lunate might be considered as a keystone in the proximal carpal row when wrist stability is considered. It is doubly intercalated: longitudinally and transversely. Wrist ligaments co-ordinate the positioning of the bones in the mid-range of carpal motions, and restrict further motion in extreme positions of the wrist joint.
