Preoperative Evaluation of VY Flap Design Based on ComputerAided Analysis VY flap is widely used in plastic surgery as an important technique for reconstructing deformities and improving appearance. In this paper, a geometrical parameter model and finite element analysis were used to study the rationale of the proposed VY flap design and the preoperative evaluation of the VY flap design. First, a geometric parameter model of the VY flap was established to analyze the five key geometric relationships affecting the flap structure and obtain a reasonable plan for the VY flap design through the crossing constraint relationship. Second, in order to verify the effectiveness of the VY flap design, the suture and release states of the VY flap during surgery were evaluated based on a simulation model of the VY flap generated by finite element analysis software. The results revealed that the approach proposed in this paper provides a feasible method for clinical VY flap design.

A biomechanical model of the human tongue and its clinical implications Many surgical technics act on the upper airway in general, and on the tongue in particular. For example, tongue is one of the anatomical structures involved in the case of Pierre Robin syndrome, mandibular prognathism, or sleep apnoea syndrome. This paper presents the biomechanical and dynamical model of the human tongue we have developed, and the method we have used to fit this model to the anatomical and physical properties of a given patientu0027s tongue. Each step of the modeling process is precisely described: the soft tissues modeling through the Finite Element Method (geometrical design of the FE structure within the upper airway and representation of lingual musculature), and the motor control of the model with the corresponding dynamical simulations. Finally, the syndromes listed above are presented, with some focus on the clinical implications of the model.