Humeral cover use To prevent fracture or damage to the cut humeral surface during the glenoid preparation, humeral covers are provided with the PRIMA Instrumentation. The humeral covers are available in three sizes (Small, Medium and Large) in order to fit with the humerus dimensions; please note that they are not related to the PRIMA stem sizes. Two options are available for this purpose: humeral plate with spikes to be applied to the humeral resection plane and monolithic humeral cover to be used with trial or definitive PRIMA Stem (Figure 29). The humeral cover with spikes is intended to be used after resection of the humeral head: the cover is placed on the resected surface and the fixation is obtained by means of the spikes. The monolithic humeral cover is used with trial stem in situ. If anatomic prosthesis is performed, proceed as described in “PRIMA Anatomic” on page 22. In case of reverse prosthesis, follow the surgical steps described in “PRIMA Reverse” on page 26.
Figure 29
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