[Spongiosa formation in plate osteosynthesis--a comparative animal experiment study of current and auto-compression plates using the Zespol principle].

Osteosynthesis with modern self-contracting plates has a few fundamental drawbacks apart from its undisputably good points. Among these drawbacks we have the pressure strain on the bone surface; the traction strain exercised by the screw thread in the bone; and, chiefly, spongiotisation and bone atrophy due to so-called stress protection. A new modification of this process, called Zespol, in which the plate is no longer fastened direct to the bone but is fastened floating over the bone surface to so-called platform screws, tries to solve these problems.