There is no such thing like ultimate head diameter in ceramic-on-ceramic THA. The diameter ranges from 28, 32 and 36 mm (Zimmer Biolox). Usually ceramic bearings with large diameters are not available because of some specific limitations of ceramics.
I would say that the surgeon must decide what diameter to use. In some patients, sizing considerations may necessitate the use of an acetabular component with a relatively small diameter. For such patients, a large-diameter ceramic femoral head may not be an option. Large-diameter femoral heads reduce the risk of hip dislocation and are favored in modern hip surgery. Unfortunately, because of design limitations related to material properties, ceramic heads are available in only a limited range of femoral head diameters; in similar cases the surgeon choosing a larger-diameter femoral head may have no choice but to use a metal head.
Zimmer BioloX delta still has an additional option of femoral head in 40 mm in diameter using for large acetabulum .
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