Response to the commentary on mechanical properties of cortical bone and their relationships with age, gender, composition and microindentation properties in the elderly.

Schwiedrzik JJ Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory of Mechanics of Materials and Nanostructures, Thun, Switzerland.
Mirzaali MJ Institute for Surgical Technology and Biomechanics, University of Bern, Switzerland.
Thaiwichai S Institute for Surgical Technology and Biomechanics, University of Bern, Switzerland.
Best JP Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory of Mechanics of Materials and Nanostructures, Thun, Switzerland.
Michler J Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory of Mechanics of Materials and Nanostructures, Thun, Switzerland.
Zysset PK Institute for Surgical Technology and Biomechanics, University of Bern, Switzerland.
Wolfram U School of Engineering and Physical Science, Institute for Mechanical, Process and Energy Engineering, Heriot-Watt University, Edinburgh, United Kingdom. Electronic address: u.wolfram@hw.ac.uk.