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Porous metals have found themselves to be suitable candidates for repairing or replacing the damaged bones since their stiffness and porosity can be adjusted on demands .
 material: Porous metals; material: be; machanical property: damaged bones; machanical property: stiffness; machanical property: porosity; material: be
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 material: Porous metals; material: be; machanical property: damaged bones; machanical property: stiffness; machanical property: porosity; material: be