If the rate of osteolysis exceeds osteogenesis what will bone do?

Bone will resorb.

Osteolysis is the process of bone resorption, while osteogenesis is the process of bone formation. If the rate of osteolysis exceeds osteogenesis, then there will be a net loss of bone tissue and the bone will resorb. This can lead to a number of problems, including pain, deformity, and fracture.