[Polyaxial angle stability].

Polyaxial screw systems are the state of the art in the field of fracture fixation. In contrast to conventional monoaxial systems, the polyaxial constructs enable variable screw angulation, enhancing the adaptability of plate-screw configurations in different surgical scenarios and different anatomical circumstances. This article provides a comprehensive overview of the functional principles, clinical applications and inherent limitations of polyaxial stability. The conventional monaxial technology restricts screw positioning, potentially compromising fixation in some fracture situations or anatomical regions. In contrast, polyaxial systems enable adapted screw placement, addressing specific requirements arising during surgery. Various locking mechanisms based on friction, deformation, thread forms and engagement techniques, play crucial roles in achieving stability. The article discusses the key currently used technologies, their mechanical characteristics and comparative behavior as the biomechanical interaction between screws and plates is crucial for achieving maximum stability and preventing failure modes that could compromise fracture healing. This article emphasizes that while polyaxial systems offer enhanced fragment-specific screw positioning, their successful application relies on careful surgical technique and an understanding of the mechanics involved. By integrating insights from clinical experiences, biomechanics, and the literature, we aim to raise awareness and support decision-making in fracture management using polyaxial systems. Ultimately, the article advocates a balanced understanding of both the benefits and challenges associated with polyaxial fracture fixation in modern orthopedic trauma surgery.