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Wielowarstwowa uniwersalna powłoka ochronno-terapeutyczna na implanty – kontrolowane uwalnianie leku z parylenu C modyfikowanego plazmą tlenową

Gołda M., Gębarowska K., Musiał-Kulik M., Kasperczyk J., Kotarba A.

Engineering of Biomaterials

2013

Vol. 16, no. 122-123 spec. iss.

36--39

Opracowano wielowarstwową ochronną powłokę polimerową na bazie parylenu C, którą modyfikowano plazmą tlenową. Przeprowadzono badania składu chemicznego powierzchni (XPS) i Swobodnej Energii Powierzchniowej (kąt zwilżania, metoda Owensa-Wendta) próbek modyfikowanego parylenu C. Otrzymano matryce z bioresorbowalnego kopolimeru L-laktydo-ko-glikolidu (PLGA) zawierające cząsteczki modelowego leku przeciwzapalnego (ibuprofen), następnie matryce poddano degradacji hydrolitycznej oraz ocenie profilu uwalniania substancji leczniczej. Zmiany zachodzące w mikrostrukturze łańcucha kopolimerowego obserwowano przy wykorzystaniu wysokorozdzielczej spektroskopii magnetycznego rezonansu jądrowego (NMR), natomiast kinetykę uwalniania leku z matryc badano metodą wysokosprawnej chromatografii cieczowej (HPLC).

The multilayer protective polymer coating based on parylene C modified with oxygen plasma was developed. The paper reports an investigation on surface chemical composition (XPS) and surface free energy (contact angle, Owens-Wendt) of modified parylene C. Bioresorbable L-lactide-co-glycolide copolymer (PLGA) was used to obtain drug-loaded matrices. The matrices underwent hydrolytic degradation and estimation of drug release profile. The microstructural changes which appeared during degradation were observed by means of high resolution nuclear magnetic spectroscopy (NMR). The kinetic profiles of drug release were investigated with high performance liquid chromatography (HPLC).

Influence of cementless cup surface on stability and bone fixation 2 years after total hip arthroplasty

Urbański W., Krawczyk A., Dragan Sz.Ł., Kulej M., Dragan Sz.F.

Acta of Bioengineering and Biomechanics

2012

Vol. 14, no. 2

27-35

Loss of fixation between bone and implant surface is one of the main treatment problems in total hip arthroplasty. It might lead to implant instability, bone loss and treatment failure resulting in revision surgery. Surface modification is a method for improving bone response to implant and increasing implant osseointegration. However, the currently applied modifications such as hydroxyapatite coatings do not meet expectation and do not provide good clinical result. The object of the study was to evaluate the influence of acetabular cup surface modification on fixation and bone remodelling in total hip arthroplasty. Clinical and radiological outcomes were evaluated in patients two years after cementless total hip replacement. Two groups were compared: patients with acetabular component with uncoated titanium surface and patients with hydroxyapatite-coated acetabular surface. Hips X-rays were analysed for early signs of losing stability of acetabular cups. Two years after surgery the analysis of X-rays did not reveal any statistical differences in stability, migration of acetabular components of endoprosthesis between both groups. No differences were also observed in bone remodelling around implants. Particularly high percentage of cups, i.e. 17.64%, were classified into the group with high risk of early implant loosening, i.e., the group with HA coatings. Hydroxyapatite coatings on titanium cementless acetabular cups implanted by press-fit technique have no influence on their stability, bone-implant fixation and the remodelling of bone surrounding an implant two years after surgery.