PRIMA Stem Surgical technique
PRIMA Anatomic Trial reduction
Insert the anatomical trial adaptor into the PRIMA trial stem using the extracting pliers for reverse trial inserts (Figure 30). Apply the neutral trial adaptor taper to the trial humeral head by hand and fit the head to the adaptor on the trial stem (Figure 31). Reduce the joint and check the match with the glenoid. If it is not well aligned with the cut humeral surface, substitute the neutral trial adaptor taper with an eccentric one (2 mm, 4 mm and 6 mm are available). To remove trial adaptor tapers from the trial humeral head use the extracting pliers for trial adaptors (Figure 32). If an eccentric adaptor is used, mark the position of the eccentricity with an electric scalpel, using the arrow of the trial humeral head as a reference (Figure 33). This procedure helps to place the final head in the correct position. After trial reduction remove the trial head, trial adaptor taper using the extractor, and the trial adaptor using the extracting pliers for reverse trial inserts.
Figure 30
Finally remove the trial stem using the positioning handle.
Figure 31
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.
Figure 32
Figure 33
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