Comparative study of two plastic materials, i.e. frozen cortical allobone and demineralized perforated (perfoost) was performed. Testing the samples from same part tibia carried out using Zwick 1464 apparatus. It showed that firmness perfoost lower than allobone: during compression - by 33%, switching 66%, bending 46% for metaphyseal sample 70% diaphyseal one. Perfoost possesses rigidity allows...