Copal bone cement loaded with gentamicin and clindamicin was developed recently as a response to the emerging occurrence of gentamicin-resistant strains in periprothetic infections. The objective of this study was to compare the in vitro antibiotic release and antimicrobial efficacy of gentamicin/clindamicin-loaded Copal bone cement and gentamicin-loaded Palacos R-G bone cement, as well as biofilm formation on these cements. In order to determine antibiotic release, cement blocks were placed in phosphate buffer and aliquots were taken at designated times for measurement of antibiotic release. In addition, the bone cement discs were pressed on agar to study the effects of antibiotic release on bacterial growth. Biofilm formation on the different bone cements was also investigated after 1 and 7 days using plate counting and confocal laser scanning microscopy (CLSM). Experiments were done with a gentamicin-sensitive S. aureus and a gentamicin-resistant CNS. Antibiotic release after 672 h from Copal bone cement was more extensive (65% of the clindamycin and 41% of the gentamicin incorporated) than from Palacos R-G (4% of the gentamicin incorporated). The higher antibiotic release from Copal resulted in a stronger and more prolonged inhibition of bacterial growth on agar. Plate counting and CLSM of biofilms grown on the
Antibiotic-laden bone cement is an important strategy of treatment for an established bone infection. It was aimed to find the safe antibiotic dose intervals of the antibiotic cements soaked in Phosphate Buffered Saline solution and to determine whether there was a difference in terms of mechanical strength between the prepared samples. This study was done in our institute Microbiology and Metallurgy laboratories. All samples were prepared using manual mixing technique using 40 g radiopaque Biomet® Bone cement (Zimmer Biomet, Indiana, USA) under sterile conditions at 19 ± 2 ºC. In this study, vancomycin (4 groups − 0.5, 2, 4, 6 g), teicoplanin (4 groups − 0.8, 1.2, 2, 2.4 g), daptomycin (4 groups − 1, 2, 2.5, 3 g), piperacillin-tazobactam (4 groups − 0.125, 0.5, 1, 2 g) and meropenem (4 groups − 0.5, 2, 4, 6 g) were measured in a assay balance and added to the cement powder. Antibiotic levels ranged from the lowest 0.625% to the highest 15%. 80×10×4 mm rectangle prism-shaped sample for mechanical measurements in accordance to ISO 5833 standart and 12×6×1 mm disc-shaped samples for microbiological assesments were used. Four sample for each antibiotic dose and control group was made. Prepared samples were evaluated macroscopically and faulty samples were excluded from the study. Prepared samples were kept in Phosphate Buffered Saline solution renewed every 24 hours at 37 ºC. At the end of 6 weeks, all samples were tested with Instron ® 3369 (Norwood Massachusetts, USA) four point bending test. Staphylococcus aureus (ATCC 29213) strain was used for samples of antibiotics containing vancomycin, teicoplanin and daptomycin after the samples prepared for antibiotic release were maintained under sterile conditions and kept in Phosphate Buffered Saline solution as appropriate. For samples containing meropenem and piperacillin - tazobactam antibiotics, Pseudomonas aeruginosa (ATCC 27853) strain was used. The addition of more than 5% antibiotics to the cement powder was significantly reduced mechanical strength in all groups(p <0.05) however the power of significance was changed depending on the type of antibiotic. In general, adding antibiotics with 2.5% and less for cement amount was not cause significant changes in mechanical measurements. There was a negative correlation between the increase in the amount of antibiotics mixed with cement and the durability of the cement (p: <0.001, r: −0.883 to 0.914). In this study, especially the antibacterial effects of piperacillin-tazobactam, containing 0.25 gr and 0.5 gr antibiotic doses, were found to be low. There was no bacterial growth in all other groups for 21 days. Considering the mechanical properties of groups containing meropenem, vancomycin, daptomycin and teicoplanin, it was observed that all antibiotic cements remained above the limit value of 50 MPa in the bending test at concentrations containing 2.5% and less antibiotics. This was not achieved for the piperacillin-tazobactam group. The findings of the study showed that each antibiotic has different MPa values at different doses. Therefore, it could be concluded that not only the antibiotic dose but also the type oould change the mechanical properties. In the light of these findings, mixing more than 2.5% antibiotics in cement for the antibiotic types included in the study was ineffective in terms of antibacterial effect and mechanically reduces the durability of cement below the standard value of 50 MPa.
Aim. One of the most severe complications of primary total knee arthroplasty (TKA) is periprosthetic joint infection (PJI). Nowadays, the use of antibiotic-loaded cement for prevention of infection is still controversial. The aim of the present study is to evaluate the use of an antibiotic-loaded cement to reduce the infection rate in primary total knee arthroplasty. Method. Prospective randomized study, with 2893 cemented total knee arthroplasties performed between 2005 and 2010 in our institution. Two different groups were formed depending on which bone cement was used, without antibiotic (the control group) or loaded with erythromycin and colistin (the study group). All patients received the same systemic prophylactic antibiotics. The patients were followed for a minimum of twelve months. The rate of infection was analyzed according to the criteria of the Centers for Disease Control and Prevention (CDC). Results. In 1452 patients the prosthetic components were fixed using
Aim. The current treatment concepts of acute and chronic osteomyelitis are associated with unsolved challenges and problems, underlining the need for ongoing medical research. The invention and prevalence of an absorbable, gentamicin-loaded ceramic bone graft, that is well injectable for orthopedic trauma and bone infections, enlarges the treatment scope regarding the rise of posttraumatic deep bony infections. This substance can be used either for infection, dead-space, or reconstruction management. The
Introduction. Antibiotic-impregnated bone cement (AIBC) has been used for decades to treat and prevent post-operative infections in joint arthroplasty. Local delivery of antibiotics may theoretically have a bactericidal effect, however evidence supporting this is controversial and literature suggests its prophylactic use in primary total knee arthroplasty (TKA) is seldom justified. With evolving standards of care, historical data is no longer relevant in addressing the efficacy of AIBC in the contemporary TKA. The purpose of this study was to evaluate outcomes following primary TKA using AIBC and regular non-AIBC by comparing rates of surgical site infection (SSI) and prosthetic joint infection (PJI). Methods. A retrospective review was conducted of all cemented primary TKA procedures from a large institutional database between January 1, 2015 and December 31st, 2016. This identified 6,073 cases, n=2,613 in which AIBC was used and n=3,460 cases using
Aim. The current treatment concepts of acute and chronic osteitis are associated with unsolved challenges and problems, underlining the need for ongoing medical research. The invention and prevalence of an absorbable, gentamicin-loaded ceramic bone graft, that is well injectable for orthopedic trauma and bone infections, enlarges the treatment scope regarding the rise of posttraumatic deep bone infections. This substance can be used either for infection, dead-space, or reconstruction management. The
The aim of this investigation was to compare risk of infection in both cemented and uncemented hemiarthroplasty (HA) as well as in total hip arthroplasty (THA) following femoral neck fracture. Data collection was performed using the German Arthroplasty Registry (EPRD). In HA and THA following femoral neck fracture, fixation method was divided into cemented and uncemented prostheses and paired according to age, sex, BMI, and the Elixhauser Comorbidity Index using Mahalanobis distance matching.Aims
Methods
We aimed to determine the concentrations of synovial vancomycin and meropenem in patients treated by single-stage revision combined with intra-articular infusion following periprosthetic joint infection (PJI), thereby validating this drug delivery approach. We included 14 patients with PJI as noted in their medical records between November 2021 and August 2022, comprising eight hip and seven knee joint infections, with one patient experiencing bilateral knee infections. The patients underwent single-stage revision surgery, followed by intra-articular infusion of vancomycin and meropenem (50,000 µg/ml). Synovial fluid samples were collected to assess antibiotic concentrations using high-performance liquid chromatography.Aims
Methods
Pelvic reconstruction after tumour resection is challenging. Pelvic replacements are usually custom made at considerable expense and then need very careful positioning at the time of surgery. They have a very high rate of complications with up to 30% risk of infection and 10% dislocation. In 2003 we developed a new type of pelvic replacement which would be simple to make, simple to use and which would hopefully avoid the major complications of previous pelvic replacements whist being versatile to use even when there was very little pelvis remaining. The concept is based on the old design of Ring stemmed hip replacement and has become known as the ice-cream cone prosthesis. It is inserted into the remnant of pelvis or sacrum and is surrounded by
The use of polymethylmethacrylate (PMMA)
Introduction: The use of polymethylmethacrylate (PMMA)
Background. Much effort has been aimed at strategies for patient optimization, perioperative standards of care, and postoperative risk stratification to reduce the incidence of SSI. Examples include, newer dressing modalities, antibiotic-impregnated
The use of antibiotic-loaded cement has become a well-accepted method to develop high local antibiotic concentrations in orthopedic surgery. A new surgical technique has been established in our department in order to further increase the local antibiotic concentration, when implanting a prosthesis during revision surgery. By additional superficial vancomycin coating of the
Despite of improved operative technique, ultra-clean air in the operating theater and systemically administered as well as in
The visco-elastic behaviour of acrylic bone cement is a key feature of cement-implant performance. The ability of the cement to creep in conjunction with a force-closed design of stem (collarless polished taper) affords protection of the vital bone-cement interface. Most surgeons in the UK use antibiotic-laden PMMA in primary total joint arthroplasty. In revision surgery the use of bespoke antibiotic-cement combinations is common. The aim of this study was to elicit the effect of antibiotics upon the physical properties of bone cement. Methods: The static properties of the cements were assessed following protocols described in ISO 5833: 2002, while the viscoelastic properties of the cement were measured with in-house developed apparatus in quasi-static conditions. Creep tests were performed in four point bending configuration over a 72 hour period in physiological conditions. Porosity was measured on the mid cross section of the creep samples using a digital image technique. The cements used were Palacos R40 and Palacos R with gentamicin. The antibiotics added included fucidin, erythromycin, teicoplanin and vancomycin in 500mg powder aliquots up to a maximum of 1g per 40 g mix. All data were analysed using ANOVA with Bonfer-roni post-hoc test. Pearson’s correlation coefficient was used to investigate the association between physical factors (SPSS). Results: The static and working properties did not vary significantly with antibiotic additions. The mean creep of the cement increased in line with the amount of antibiotic added. The specific antibiotic was not relevant. The differences were statistically significant. Mean porosity also increased with antibiotic mass. There was a linear relationship between cement porosity and creep!. Conclusions: Despite modern mixing techniques the porosity of
The weak points and complications of the classic spacers are eliminated by the construction of an articulated spacer. We did have very good results with the application of a classic spacer and considered the negative properties of the articulated spacer as a foreign matter in the wound. Gradually, the excellent literary results, standardization of the procedure, faster rehabilitation and a significant growth of comfort for the patient convinced us of the fact, that we chose the right way. Therefore we prepared and verified the new implant. In its construction we used the experience from the creation of classic spacers as well as the principle of a drained spacer allowing a drainage of the cavity of the femur. The implant is constructed as a module to be enwrapped by as large amount of the
Thermal stability is a key property in determining the suitability of an antibiotic agent for local application in the treatment of orthopaedic infections. Despite the fact that long-term therapy is a stated goal of novel local delivery carriers, data describing thermal stability over a long period are scarce, and studies that avoid interference from specific carrier materials are absent from the orthopaedic literature. In this study, a total of 38 frequently used antibiotic agents were maintained at 37°C in saline solution, and degradation and antibacterial activity assessed over six weeks. The impact of an initial supplementary heat exposure mimicking exothermically curing bone cement was also tested as this material is commonly used as a local delivery vehicle. Antibiotic degradation was assessed by liquid chromatography coupled to mass spectrometry, or by immunoassays, as appropriate. Antibacterial activity over time was determined by the Kirby-Bauer disk diffusion assay.Objectives
Methods
Induced membrane technique is a relatively new technique in the reconstruction of large bone defects. It involves the implantation of polymethylmethacrylate (PMMA) cement in the bone defects to induce the formation of membranes after radical debridement and reconstruction of bone defects using an autologous cancellous bone graft in a span of four to eight weeks. The purpose of this study was to explore the clinical outcomes of the induced membrane technique for the treatment of post-traumatic osteomyelitis in 32 patients. A total of 32 cases of post-traumatic osteomyelitis were admitted to our department between August 2011 and October 2012. This retrospective study included 22 men and ten women, with a mean age of 40 years (19 to 70). Within this group there were 20 tibias and 12 femurs with a mean defect of 5 cm (1.5 to 12.5). Antibiotic-loaded PMMA cement was inserted into the defects after radical debridement. After approximately eight weeks, the defects were implanted with bone graft.Objectives
Methods