Humeral head resection
The humeral head resection technique is performed with the PRIMA instrumentation. The humeral head resection is performed with an anatomical angle (135°) for both PRIMA Anatomic and PRIMA Reverse implants. Open the proximal end of the humerus with the awl connected to the T-handle with Zimmer connection (Figure 1). Insert the awl into the humerus until the stopper flange comes in contact with the surface of the humeral head. Connect the Ø 6 mm humeral intramedullary rod to the T-handle with AO connection and attach the cutting jig connector, finally insert the assembly into the humerus. Prepare the anatomic resection jig by properly connecting it to the guide for resection jigs (Figure 2). Connect the alignment rod to the assembly on the LEFT or the RIGHT hole of the delto-pectoral (DP) side to obtain the chosen retroversion angle (0°, 20° and 30° positions are available). Finally connect the assembly to the Ø 6 mm intramedullary rod according to the side that is being operated. For a left shoulder, the mark LEFT shall be frontally visible on the guide and vice versa the mark RIGHT for a right shoulder.
Figure 1
Guide for resection jig
Anatomic resection jig
Figure 2
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