
Canal Flare Index
A ninety-three cadaver database of proximal humeri and matching scapulae was utilized to determine the optimal endosteal canal flare index of the Foundation® Total Shoulder design. Canal flare index has important implications in designing an anatomical humeral stem for inherent stability in rotation and bending.
Larger Radius
Anatomical studies have shown that having the radius
of the glenoid slightly greater than the radius of the
humeral head provides advantages of allowing
translation without loading the glenoid rim. Based on
these studies, the radius of curvature of the Foundation
glenoid component is 3mm larger in the
superior/inferior dimension and 6mm larger in the
anterior/posterior dimension than the corresponding
humeral head.
Head Size Range
Fifteen CoCr neutral humeral head sizes are available representing 5 diameters with 3 standard heights for each diameter. Ten CoCr offset humeral head sizes are available allowing the surgeon unlimited options in head alignment. This comprehensive size range allows for optimum soft tissue balancing.
Optimized Canal Flare Index
Superior-Inferior Mismatch
Anterior-Posterior Mismatch
Foundation Shoulder Heads