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7 Conclusions In this paper , the current status of the topological design of porous metallic implants and the fabrication of such implants using additive manufacturing is reviewed .
 engineering feature: topological design; application: porous metallic implants; manufacturing process: fabrication; application: implants; manufacturing process: additive manufacturing
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: topological design; application: porous metallic implants; manufacturing process: fabrication; application: implants; manufacturing process: additive manufacturing