[Effect of shock waves on hip prosthesis implantation (preliminary report)]

Revision of total hip arthroplasty has increased dramatically and it began to be a big problem, because of the number of reoperation is growing directly with the number of primoimplantation. Extraction of bone cement from the canal of the femur is timely and technically very difficult and related with many complications. Therapy by ESWL was applicated in clinical praxis for the first time in the therapy of urolithiasis and then choledocholithiasis. Now it is used in orthopedy for the therapy of pseudoarthrosis, entesopathia and anthores. In our experiment we used models of pork femur to which we implanted the endoprothesis to bone cement. We expouned these samples to ESWL and controlled the ability of releasing of the endoprothesis. We replayed the experiment for four times after an abnormal number of shockwaves (more than 8,000 shocks), in two cases endoprothesis release spontaneously, in one case we needed a little power to release it and in the four cases the releasing was not achieved. These results show the probable influence of the shockwaves between the layers metal-cement and cement-bone spongiosa.