[Possibilities of restoration of fresh ligament injuries of the knee].

Author briefly summarizes the changes in the aspects and diagnostics of the ligament injuries of the knee. He deals with the methods of treatment used at his Department and with the operative procedures and describes in details the types of injuries of the single parts and the possibilities of reconstruction. His unambigous opinion is that in fresh ligament injuries the best result can be expected from the early complete reconstruction.

Morphological investigations of a porous aluminum oxide ceramic and the consequences for clinical application.

The ingrowth of bone and the tissue compatibility of a Hungarian aluminum-oxide ceramic have been investigated in animal experiments by microscopic section, by electron microscopy, and with energy-dispersion X-ray microanalysis. Surrounding bone grew into the 100- to 500-micron pores of the porous ceramic without any undesirable reaction, as well as into bored holes 500 micron in diameter. It is technically possible to make only the 1- to 2-mm deep superficial layer of such a material macroporous, so that it can be applied as an acetabular component of hip prostheses; if the surrounding bone grows into the macropores of this thin layer (as was shown in our experiment) it can perfect the connection between the living bone and the non-living ceramic material without essentially changing the much required, positive qualities of a solid acetabular component.

[Our corrective osteotomy for radius fractures healed in defective position at the typical spot].

Authors give literary survey about correction possibilities of Colles fractures healed in failed position. In their paper the procedure of their clinic reviewed: with oscillating saw a wedge is removed from the radius on place of the failed fracture and so the normal angles of the radiocarpal joint can be restored. But at the same time the ulna must also be shortened with removal of a segment from the distal part.