1850
AM is used to create a complex porous geometry of titanium that aims to promote bone ingrowth in a lumbar spine fusion process .
 manufacturing process: AM; machanical property: porous; concept or principle: geometry; material: titanium; concept or principle: bone ingrowth; concept or principle: lumbar spine fusion process
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:
 manufacturing process: AM; machanical property: porous; concept or principle: geometry; material: titanium; concept or principle: bone ingrowth; concept or principle: lumbar spine fusion process