Title: A Useful Allrounder

Inja Allemann

Luzerner Kantonsspital, Switzerland


Inja Allemann MD is the only double bard-certified Dermatologist and plastic surgeon in Switzerland. She trained at the University Hospital of Zurich, Switzerland and obtained the board certification in Dermatology in 2007. After research on melanoma she focused on dermatologic surgery and headed the laser clinic and aesthetic practice of the dermatologic clinic at the University Hospital of Zurich. She then changed to the Clinic for Plastic surgery at the University Hospital of Zurich and finished her board-certification in Plastic surgery at the Kantonsspital Luzern in Lucerne, Switzerland in 2017. In 2018 she opened her own clinic Rivr in the heart of Zurich. Her focus is aesthetic and reconstructive plastic surgery, dermatologic surgery and laser medicine.


The first time the Keystone flap was described it was in 2003 by a group of plastic surgeons in Australia. Interestingly, it has not shown the popularity one would expect from such a versatile flap. By design, it is a perforator flap with a curvilinear shaped trapezoidal design. Looking into architecture and how Roman arches were build, it becomes clear where the name comes from. If lesions can be excised in an elliptical manner, they can be reconstructed with a keystone flap. Four different types of Keystone flaps have been described. While using the classic design of the Keystone flap, we soon started using our own modification of the classical design. In our experience, this is a highly versatile and safe flap that can be used on almost any location of the body and allows reconstruct even very large defects.

Audience take away:


  • The audience will get to know the keystone flap
  • They will be shown how to practically design the flap and what indications to use it for
  • It provides a very practical solution to the reconstruction of many defects on various locations, especially big defects that frequently are not easy to close with other local flaps