[Material technical prerequisites and biological principles for alloplastic replacement of the cruciate ligament]

The biomechanical system "knee joint" which is disturbed in chronic knee ligament instabilities can be repaired by means of synthetic ligaments; however, the correspondent materials have to meet some technical requirements which are described in the present work. The introduction of foreign bodies into tissue incite some defined reactions which may increase or decrease the functional value of the alloplastic ligament prosthesis; the correlations and dependencies are presented. An appropriate alloplastic knee ligament prosthesis is offered taking into account the requirements for material and the biologic reactions described.