PRIMA Stem Surgical technique
PRIMA Reverse Important! In the reverse configuration PRIMA Stem is intended for use only with SMR 40 mm or 44mm glenospheres. The surgeon can further choose between regular and lateralized connectors, according to the joint tensioning. Trial reduction The trial components feature color coding to support the surgical team using the system.
Figure 41
PRIMA reverse insert
Color code
Dia. 40mm
Blue
Dia. 44mm
Green
Choose the trial reverse insert according to the implanted 40 mm or 44 mm glenosphere and insert it into the trial stem by means of the extracting pliers for reverse trial inserts (Figure 41).
PRIMA reverse insert
Size
Figure 42
Insert Short
0mm
Insert Medium
+3mm
Insert Long
+6mm
Insert Medium - Offset
+3mm, 3mm offset
Insert Long - Offset +6mm, 3mm offset The trial reverse insert is available with 0° and 7° angle. If using a 7° or an OFFSET trial reverse insert, mark the position of the slit of the trial insert on the resected surface in order to reproduce it with the final implant (Figure 42). Reduce the implant to verify the shoulder tensioning and address any laxity by replacing with the next liner size. The choice of liner thickness is made by the surgeon to ensure the correct tension, prevent any laxity in the joint, restore the correct offset of the joint. To remove and replace the trial reverse insert use the extracting pliers for reverse inserts. Note. The trialing phase may also be performed on the definitive PRIMA stem to assess range of motion and implant size selection, at the discretion of the surgeon, paying attention to avoid any stress to the implanted stem.
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