Table 1.

Strain Values (µstrains) Classification According to Frost’s Law

Below 50 µstrains	Disuse zone	New bone is not developed normally, loss of bone occurs
50 µstrains → 1500 µstrains	Adaptive zone	Bone conservation, tend to equal but not exceed the amount resorbed, healthy active growing
1500 µstrains → 3000 µstrains	Mild overload zone	Bone strengthening, changes in its architecture where and as needed to lower its strains, healthy active growing
Above 3000 µstrains	Overload zone	Peak Strains lead to bone growth, may or may not be positive