[Surgical indication for hip endoprosthesis]

The authors give a short review of the history, development, results of the joint endoprosthetic, regarding mainly to the hip replacement, based on their own data and on international references. It is suggested that the development of the modern surgical technique changed the condition of the indication which needs a wide publicity.

[Value of osteotomy of the proximal end of the metatarsal base in Köhler II disease]

Authors briefly describe the etiology of Köhler II. disease and the possibilities of the operative treatment. The osteotomy of the proximal end of the metatarsus, performed by them, the biomechanical basis of the operation, the indication are detailed and the favourable experiences gained with this procedure are reported.

Biomechanical aspects of femoral stem anchoring during total hip replacement

Stem instability is the major cause of complications following total hip replacement. To prevent its onset, the authors based their method on Wolff's law of bone transformation. Of the known prostheses, the straight-stem one fitting best to the shape of medullar cavity was chosen and by its sagittal enlargement in three different sizes a new stem collection was designed. Stems providing the closest fit to the medullar cavity were selected by computer-assisted adjustment to three-directional X-ray pictures. The principle seems to be supported by preliminary results.