Study the Regularity of Micro-Texture Parameters of Bone Milling Tool Surface for Wettability Improved and Bone Surface Damage Reduction

In total knee replacement surgery, the excessive cutting force generated when cutting bone tissue can cause bone cracks and stress concentration, leading to mechanical damage of bone tissue and surrounding tissues and affecting the fit precision of the joint. Reasonable micro-texturing can improve the tool’s surface wettability and cutting performance, reduce the appearance of the above problems, and thus improve the quality of bone cutting. For this reason, this study assessed the surface wettability of micro-texture on a cutting tool surface using a contact angle measurement meter. A bone milling test platform was established to explore the effects of micro-texture parameters on bone milling forces. Scanning electron microscopy was used to observe the morphology of the milled bone surface. Strains on the bone surface after loading were observed by two-dimensional digital image correlation to investigate the effect of micro-texture parameters on bone surface damage. The results proved that micro-textured bone milling tools with stronger hydrophilicity reduced the bone milling force, thus reducing the bone surface’s damage and improving bone milling quality.