PRIMA Stem Surgical technique
If needed, the PRIMA instrumentation includes humeral covers to be applied to protect the resected humeral cut. Two options are available for this purpose: humeral plate with spikes to be applied to the humeral resections plane (Figure 9A) and monolithic humeral cover to be used with PRIMA stem trial (Figure 9B). Humeral head resection using the extramedullary cutting template Take from the instrument set the cutting template; screw the alignment rod in the chosen retroversion hole (0°, 20° and 30° positions are available). A black laser marking allows to visualize the available retroversion holes (Figure 10). For a left shoulder, the mark “L” shall be visible on the front of the template and vice versa the mark “R” for a right shoulder. Place the cutting template onto the humerus (Figure 11) and align the alignment rod with the forearm flexed at 90°, finally fix the cutting template using the Ø 3 mm pins included into the instrument set (Figure 12). A distal hole for k-wire is available to further stabilize the template, if needed (Figure 10A). The humeral head should be resected exactly at the level of the anatomical neck. Perform the head resection with an oscillating saw.
Figure 9A
Figure 9B
Figure 10A
Figure 10
Figure 11
Figure 12
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