C. Krettek et al., A NEW AIMING DEVICE FOR THE DISTAL INTERL OCKING SCREWS OF THE UNREAMED TIBIAL NAIL (UTN), Langenbecks Archiv fur Chirurgie, 1996, pp. 1179-1179
The complex 3D-problem of distal aiming is reduced to three easier 2D-
steps: (1) Preadjustment of an aiming handle: This defines rotation an
d distance of distal locking holes relative to the proximal nail end.
During insertion, the nail usually bends. This is why a readjustment i
s necessary. (2) Re-adjustment for transverse holes: At the level of t
he distal nail end, a roughly placed ''contact hole'' is drilled. An a
symmetric spacer is inserted, placed directly onto the nail and connec
ted with the aiming arm. By this re-adjustment, direction and plane of
both distal transverse holes are defined. (3) Re-adjust ment for ap h
ole: The upper transverse hole is over-reamed (diameter 6.0 mm). A cen
tering unit inserted into this channel locks the nail to the aiming ar
m. After this readjustment in the frontal plane, the ap hole is define
d. Advantages: Simple and reliable; drill holes more precise; radiatio
n-free distal targetting.