Not all bones grow at the same rate and the individual growth rate of a bone changes over a lifetime, therefore periodic growth marks can take irregular patterns. This indicates significant chronological events in an individual's life. The use of bone as a biomaterial is useful in investigating structure-property relationships.
Since bones don't all grow at the same speed and their growth rate changes over time, it's possible to find unusual patterns in periodic growth marks. This can indicate major life events, making bone an excellent material for studying how its properties relate to structure.