43
42
Eccentric Glenosphere
slide the eccentric glenosphere on the 1.5 mm guide
pin. slide the glenosphere orientation guide onto
the screwdriver core and position it in the eccentric
glenosphere central slot (Figure 76).
The arrow marked on the orientation guide should be
aligned with the base of the coracoid process to position
the eccentricity correctly. maintain the orientation guide
in the required position and screw the glenosphere into
place using the screwdriver until the glenoid bearing
closes on the taper of the metaglene (Figure 77). Remove
the guide pin.
DEFiNiTivE gLENosphERE FiXATioN
EccENTRic gLENosphERE
obtain further impaction of the junction by gently
hammering the glenosphere with the glenosphere
impactor a minimum of three times, using at least a 700 g
hammer (Figure 78). Then tighten the glenosphere central
screw again. care should be taken to ensure that the
glenoid bearing is fully locked onto the metaglene. The
gentle hammering and screwing procedure can therefore
be repeated if necessary, until further screw tightening,
without excessive torque, is not possible.
Figure 77
Figure 78
Figure 76
