[The evaluation of the properties of the silicone-rod and tissue reation after 5,5 years period of implantation]. / Ocena wlasciwosci preta silikonowego oraz odczynu tkanek po 5,5 letnim okresie implantacji.

In this study we presented a case of prolonged detention of the temporary flexor tendon prosthesis after implantation in the hand. The silicone-rod removed after more than 5 years was subject to an examination: scanning microscopy, measurement of hardness, scanning differential calorimetry, spectroscopy in infra-red and resistance examinations. The obtained results were compared with a findings after examinations of the new, not used silicone-rod. The greatest changes were observed in maximum value of tensile strength (sigmaB) of the material after test of uniaxial tensile tests, which was about 30% smaller for a silicone-rod after implantation. The other result of investigations didn't reveal an important differences between a new and a used rod. The comparison of the tissue reaction was performed by collection a part of sheath in described case and a part of sheath produced around a rod after 10 weeks period of implantation. The generation of a capsules consisted of fibrous connective tissue with concomitant inflammation process was observed in both cases in histopathological view. Silicone rubber is a material which preserve its most important properties even after prolonged period of implantation.

[Damage of hip prosthesis causing failure in arthroplasty]. / Uszkodzenia endoprotezy stawu biodrowego jako przyczyna niepowodzen alloplastyki.

Analysis of retrieved hip joint was presented. Bone remodeling considering the distribution of friction products was discussed. Scanning electron microscopy methods were used to perform on structural analysis. We expressed a surface changing prosthetic head as Ra (roughness average). X-Ray Microanalysis was applied to study products of degradation.