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This calls for a well-established design methodology integrating structural stiffness with fluid permeability to allow the implant to have both adequate rigidity to resist the physical loading and sufficient permeability to transfer cells , nutrients , etc .
 engineering feature: design; machanical property: stiffness; machanical property: fluid permeability; application: implant; machanical property: permeability; application: cells
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:
 engineering feature: design; machanical property: stiffness; machanical property: fluid permeability; application: implant; machanical property: permeability; application: cells