Arthroscopic debridement with shaver is a standard procedure for the treatment of meniscus injury. The tissue damage level and surface quality depend significantly on the performance of the instrument and clinical operation. Therefore, it is critical to understand the cutting mechanism which causes collagen fibril fracture, in order to optimize the instrument designing and surgical processing. Nevertheless, there are only limited studies focusing on the cutting characteristics related to arthroscopic debridement. In this study, the effects of arthroscopic shaver design and the cutting parameters were investigated and considered in a model to characterize the differences in cutting force and surface quality. Furthermore, the fracture mechanics was studied based on the basic characteristics of meniscus. The results showed that the fibril structure contributed significantly to meniscus failure. Meniscus is a special composite, comprising the combination of soft tissue and fibre-reinforced composite. The geometry of the cutting teeth is a significant factor affecting the cutting force, mainly reflecting the area of the created surface and the fracture toughness in different direction. High surface quality could be achieved by optimizing the shaver combination and cutting parameter. The cutting experiment and compressive test on elemental cutting tool indicated that delamination is the main reason of meniscus failure. It concentrates on the interface between fibril bundles due to the shear and tensile strain generated by compression load. Moreover, crack bridging and uncracked ligament bridging are also common phenomena that occur during the process of meniscus fracture. Findings in this study may provide guidance to orthopedic surgeons for selecting appropriate arthroscopic shavers.

剃须刀的关节镜清创术是治疗半月板损伤的标准方法。组织损伤程度和表面质量在很大程度上取决于仪器的性能和临床操作。因此，了解导致胶原蛋白原纤维断裂的切割机制至关重要，以优化器械设计和手术过程。然而，只有很少的研究集中在与关节镜清创术相关的切割特性上。在这项研究中，对关节镜剃须刀设计和切削参数的影响进行了研究，并在模型中加以考虑，以表征切削力和表面质量的差异。此外，根据弯月面的基本特征研究了断裂力学。结果表明，原纤维结构显着促进了半月板衰竭。半月板是一种特殊的复合材料，由软组织和纤维增强复合材料组成。切削齿的几何形状是影响切削力的重要因素，主要反映了加工表面的面积和不同方向的断裂韧性。通过优化剃须刀组合和切割参数，可以实现较高的表面质量。对基本切削刀具的切削实验和压缩试验表明，分层是弯月面破坏的主要原因。由于压缩载荷产生的剪切和拉伸应变，它集中在原纤维束之间的界面上。此外，弯月桥和未开裂的韧带桥也是在半月板断裂过程中发生的常见现象。这项研究的结果可能为骨科外科医生选择合适的关节镜剃须刀提供指导。