An evolutionary game to describe doping dynamics.

The objective of this research is to delve deeply into the complex dynamics of doping in various sports disciplines, seeking to uncover the underlying mechanisms that contribute to its proliferation. Our approach involves employing ecological and biological models in conjunction with evolutionary game theory, an original aspect of this study. These models will be instrumental in simulating and understanding the intricate interactions and competitive strategies that drive athletes toward doping.

Complete polyethylene wear-through and secondary breakage of the expansion cup in a ceramic-polyethylene total hip.

Introduction: Catastrophic polyethylene failure is an uncommon complication of ceramic-on-polyethylene total hip arthroplasty (THA) because of the favourable tribological characteristics of these implants. We present a case of a 50-year-old woman who formerly underwent bilateral ceramic-on-polyethylene THA with expansion acetabular cups and eleven years later presented with unilateral THA dislocation, secondary to catastrophic polyethylene failure and metal shell fracture.

Case Presentation: The patient came to our hospital for worsening pain in her left hip and an acute incapacity to bear weight on her left lower limb.