Recently a patient in Spain received recently, a 3D printed titanium sternum and ribs as an implant.
Due to the patient’s condition, doctors needed to cut and remove the sternum and some ribs. Usually, they are being replaced by a titanium plate, which is becoming unstable after a certain amount of time. But this time something amazing happened. Doctors and scientists cooperated to create a unique, and custom made 3D printed chest implant.
After scanning the patient’s body, they printed a titanium implant that fits perfectly at the patient’s chest. This could have never happened, without the 3D printing technology. It would be so difficult and expensive to make that none could afford it. And this is the first of many!
After reading about this, I wanted to find out what bone-formulas are out there! And I used fxSolver’s database of course!
My first finding is the “Electric charge density displacement” equation. 
Piezoelectricity is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress. D is the Electric charge density displacement in C/m2, ϵ is Permitivity (F/m) and E the Electric field strength (V/m).
My second and more interesting finding is this worksheet. We need to “Calculate the change in length of the upper leg bone (the femur) when a 70.0 kg man supports 62.0 kg of his mass on it, assuming the bone to be equivalent to a uniform rod that is 45.0 cm long and 2.00 cm in radius.”
In you haven’t already clicked the link to see the worksheet by yourself, here it is:
Awesome right?
Go ahead, check other worksheets, or make your own. It is very handy and useful. You will find some help in our fxSolver video.
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