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28
ANTERioR AND posTERioR mETAgLENE
scREW pLAcEmENT
screw length is determined from the laser marks on the
drill bits or using the depth gauge. place the guide pin in
the drilled hole.
slide the corresponding screw onto the guide pin and
tighten using the 3.5 mm cannulated hex screwdriver for
non-locking screws or the locking screwdriver for locking
screws (Figure 46).
Follow the same procedure for the posterior screw. Then
tighten all four screws alternately to obtain maximum
compression.
Then proceed with locking the polyaxial screws. place the
locking screwdriver main body in place on the inferior
screw head. make sure that the screwdriver sleeve is in
its upper position and not in contact with the screw head
anymore.
slide the locking screwdriver internal rod into the main
handle. The tip of the internal rod will make contact with
the screw head and tightening it fully will lock the screw
in place by expanding its head (Figure 47). Repeat the
same operation to secure the superior locking screw and
anterior or posterior screws, if polyaxial screws have been
used. The metaglene is now secure (Figure 48) and the
humeral preparation can be carried out.
Figure 46
Figure 48
Figure 47
