The biomechanics of hand and wrist fractures involve a sophisticated interplay of various anatomical structures, mechanical forces, and distinct injury patterns. This chapter delves deeply into the mechanisms of fractures that occur in key anatomical regions, including the distal radius, carpal bones, metacarpals, and phalanges. The exploration begins with a detailed examination of how different loading conditions—axial, shear, and torsional forces—account for the various patterns of fractures that can occur. Notable emphasis is placed on prevalent injuries, such as Colles’ and Smith’s distal radius fractures, where the impact’s orientation and nature lead to characteristic break patterns. Additionally, scaphoid fractures are discussed, highlighting their unique vascular considerations that can complicate healing, as well as complex injuries like perilunate dislocations that pose significant challenges in treatment. This chapter insightfully examines the biomechanical principles surrounding pediatric fractures, exploring conditions such as greenstick and torus fractures. These injuries are discussed in terms of the distinct mechanical properties of immature bone, which is more flexible and can sustain different types of deformation compared to the adult bone. Moreover, the text addresses the mechanical basis for various surgical interventions and the following rehabilitation strategies. It emphasizes the crucial role of understanding force transmission and structural stability when developing effective treatment plans. This understanding allows for the selection of appropriate surgical techniques and rehabilitation protocols, ensuring optimal recovery and reducing the risk of complications. Overall, this comprehensive analysis equips clinicians and researchers with essential knowledge about the mechanical principles governing hand and wrist injuries, ultimately promoting evidence-based fracture management and rehabilitation practices.