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Online ISSN 1827-1707
96° CONGRESS OF THE PIEDMONTESE-LIGURIAN-LOMBARD SOCIETY OF ORTHOPEDICS AND TRAUMATOLOGY (SPLLOT) (Brescia, September 24-25, 1999)
BIOMATERIALS IN ORTOPEDICS: EXPECTATION AND CLINICAL PRACTICE
Croce A., Mondini A., Volontè L., Panzeri A.
Purpose. This paper describes a personal experience in the use of hydroxiapatite-coated hemispheric acetabular cup. It is very important to obtain a primary fit, but it was also demonstrated that a hydroxiapatite-coated cup is able to guarantee stability for many years after implantation.
Materials and methods. Between January 1990 and December 1994, 310 ABG hip prostheses have been implanted in our department. The follow up consisted in X-ray and DEXA (double foton scans) performed at 3, 6 an 12 months affer the implantation and then annually.
Results. We evaluated the three Delee-Charnley areas and we found that in the 1 and in the 2 Zone the bone has been remodelled, the trabeculae were more physiologically homogenized and oe pre-existing sclerosis was reducted. ln the 3 Zone, 1% of oe cases revealed a radioluminescence line outlined by a rim of sclerosis that was already visible 6 months after the implant (however that line was never more than 1 mm wide and never expanded into adjacent areas). Complications included two cases of aseptic and one case of septic mobilization (this case required the removal of the implant), one case of polyethylene component deterioration and one case of rupture af an antirotatory spine.
Conclusions. This cup well integrates into the bone, getting also an optimal distribution of the mechanical stresses. The press-fit system achieves a very good primary stability, the HA-coating guarantees a long term stability and the antirotatory spines are ver resistant to shearing forces.