15
14
humERAL hEAD REsEcTioN
Drive the cutting assembly down the intramedullary
canal until full contact with the superior humeral head is
obtained.
insert the orientation pin through the hole in the cutting
handle, to achieve desired retroversion. The retroversion
is calculated with reference to the forearm axis. This
should preferably be close to 0-10° since excessive
retroversion can restrict joint motion, especially internal
rotation. however care should be taken not to damage
the subscapularis insertion by resecting the head with
excessive anteversion. The cutting handle should then
be rotated to align the orientation pin and the forearm
(Figure 15).
slide the cutting plate to adjust the cutting level. The
cutting plate colour code indicates the appropriate
resection level. if the cutting level indicator is green,
the guide is at the correct height. if it is red, the cutting
plate needs to be adjusted (Figure 16).
Figure 15
Figure 16
superior-lateral cutting plate
Delto-pectoral cutting plate
cutting plate level adjustment
