ABSTRACT
Pseudarthrosis and necrosis of the proximal pole of the
scaphoid are difficult to treat and the outcome is uncertain,
particularly in elderly people. Eventually, this problem leads to
radioscaphoid arthritis, which progressively spreads to the
entire wrist and causes carpal collapse, in a typical pattern:
scaphoid nonunion advanced collapse (wrist). In the same way,
scapholunate dislocation rapidly leads to styloscaphoid
arthritis in which the capitate collapses into the scapholunate
space: scapholunate advanced collapse (wrist). Several authors
have previously advocated the replacement of the proximal
pole of the scaphoid. The silicon spacer promoted byMichon (1)
then by Zemel (2) is no longer used and has been replaced by
autologous biological materials proposed by Eaton (3). Jones (4)
proposed a spherical vitallium implant, whereby the prosthesis
was put into a cage with the risk of dislocation.
