[Tripolar cups].

  title={[Tripolar cups].},
  author={Bernd Fink},
  journal={Zeitschrift fur Orthopadie und Unfallchirurgie},
  volume={153 2},
Tripolar cups can be separated into constrained and unconstrained dual-mobility cups. The latter show better survival and revision rates. The main problem is the polyethylene wear. Therefore modern types of polyethylene are used in these cups. The indications for dual-mobility cups are recurrent dislocation and situations where the risk of dislocation is increased. 

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