INTERET DES ESPACEURS DE CIMENT AUX ANTIBIOTIQUES DANS LA CHIRURGIE DE REPRISE DE PROTHESES SEPTIQUES EN DEUX TEMPS (RESULTATS PRELIMINAIRES D'UNE SERIE CONTINUE DE 22 CAS)

RENNES1-BU Santé (352382103) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Prothèse totale de hanche non cimentée à couple de frottement métal / métal metasul diamètre 28 mm (à propos d'une série continue rétrospective de 63 cas à 10 ans de recul moyen)

Depuis la fin des années 80, le couple de frottement métal-métal est utilisé comme alternative au couple de frottement conventionnel dans le but de réduire l'incidence du descellement aseptique induit par les débris d'usure du polyéthylène. Le but de la présente étude est d'évaluer les résultats à long terme d'une série de prothèses totales de hanche (PTH) à couple de frottement métal-métal Métasul (Zimmer, Winterthur, Suisse) en diamètre 28 millimètres. Soixante-trois PTH non cimentées ont été implantées consécutivement chez 51 patients. L'évaluation clinique et radiographique ainsi que l'analyse des courbes de survie ont été réalisées à 10 ans de recul moyen post-opératoire. Trois hanches (5%) ont été revisées. Le taux de survie avec pour événement final la révision toute raison confondue était de 0,95. Le score de Harris moyen lors de la revue était de 93,5. Une seule hanche a été révisée à 3 ans pour des douleurs récurrentes inexpliquées et présentait une absence d'ostéo-intégration de la tige. Aucune ostéolyse péri-prothétique expansive n'a été retrouvéeSecond-generation metal-on-metal bearings was used since the late 1980s as alternative bearings to eliminate aseptic loosening due to polyetylene wear. The aim of the present study is to evaluate the long-term results of a series of Metasul (Zimmer GmbH, Winterthur, Switzerland) metal-on-metal total hip arthroplasty (THA). Sixty-hree cementless THAs with a 28-mm Metasul articulation were performed on 51 consecutive patients. The results were retrospectively reviewed at 10 years postoperatively. Clinical and radiographic evaluations and implant survivorship were performed. Three hips (5%) were revised. The overall survivorship rate with revision for any reason as the end point was 0.95. The average Harris hip score was 93.5. Only one hip, revised for unexplained recurrent pain, showed a stem's osseointegration absence. No expansive osteolysis adjacent to the implants was found.RENNES1-BU Santé (352382103) / SudocSudocFranceF

Ultrasound in Total Hip Replacement Value of Anterior Acetabular Cup Visibility and Contact With the Iliopsoas Tendon

International audienceObjectives - To assess visibility of the acetabular cup in total hip replacement and to determine the value of direct and indirect signs of iliopsoas impingement syndrome with ultrasound. Methods - Ultrasound examinations were performed by a single operator in 17 patients with iliopsoas impingement syndrome and 48 control patients. Cup visibility, contact between the cup and psoas tendon, and the presence of indirect signs of iliopsoas impingement syndrome were investigated in all patients. When the acetabular cup was visible, its size and position in relation to the psoas tendon were recorded. Results - Anterior cup visibility (P = .03), contact with the psoas tendon (P < .001), psoas tendinopathy (P = .02), and iliopsoas bursitis (P < .001) were significantly associated with iliopsoas impingement syndrome, the latter reported with specificity of 100%. In the sagittal plane at the level of the psoas tendon, a maximum sagittal length of greater than 5 mm and a posteroanterior cup shift of 3 mm or greater yielded respective sensitivities of 82% and 59% and specificities of 81% and 100%. Conclusions - When iliopsoas impingement syndrome is clinically suspected, the presence of iliopsoas bursitis or a posteroanterior cup shift of greater than 3 mm under the psoas tendon serve to confirm the diagnosis. In the absence of these conditions, a therapeutic test may be necessary because of the incomplete, albeit high, specificity of other signs

Use of MALDI-TOF mass spectrometry after liquid enrichment (BD Bactec™) for rapid diagnosis of bone and joint infections

International audienceAdvantages of MALDI-TOF MS (MS) were evaluated for diagnosis of bone and joint infections after enrichment of synovial fluid (SF) or crushed osteoarticular samples (CSs). MS was performed after enrichment of SF or crushed osteoarticular samples CS (n = 108) in both aerobic and anaerobic vials. Extraction was performed on 113 vials (SF: n = 47; CS: n = 66), using the Sepsityper(®) kit prior identification by MS. The performances of MS, score and reproducibility results on bacterial colonies from blood agar and on pellets after enrichment in vials, were compared. MS analysis of the vial resulted in correct identification of bacteria at a species and genus level (80.5% and 92% of cases, respectively). The reproducibility was superior for aerobic Gram-positive bacteria (Staphylococci and Gram-positive bacilli: 100% colonies), as compared to aerobic Gram-negative bacilli (89.7%), anaerobes (83.3%) and Streptococcus/Enterococcus (58.8%). MS performance was significantly better for staphylococci than for streptococci on all identification parameters. For polymicrobial cultures, identification (score>1.5) of two species by MS was acceptable in 92.8% of cases. Use of MS on enrichment pellets of bone samples is an accurate, rapid and robust method for bacterial identification of clinical isolates from osteoarticular infections, except for streptococci, whose identification to species level remains difficult

Development of a dosing-adjustment tool for fluoroquinolones in osteoarticular infections: The Fluo-pop study

International audienceFluoroquinolones efficacy depend on both the drug exposure and the level of drug resistance of the bacteria responsible for the infection. Specifically for the Staphylococcus species, which is the microorganism mainly involved in osteoarticular infections (OAI), in-vitro data reported that an AUC/MIC ratio above 115 h maximizes drug efficacy. However, data on OAI patients are lacking and a simple approach to access AUCs is still a clinical issue. We conducted a prospective, single-center study in 30 OAI patients hospitalized in the Rennes University Hospital to model ofloxacin pharmacokinetics and to define a limited sampling strategy (LSS) suitable for ofloxacin and levofloxacin treatments. Modeling was conducted with the Monolix software. The final model was externally validated using levofloxacin data. Monte-Carlo simulations were used to evaluate the probability of target attainment (PTA) of different dosing regimens. Two hundred and ninety-seven (297) ofloxacin concentrations were available for the pharmacokinetic modeling. Ofloxacin pharmacokinetics was best described using a bicompartmental model with a first order elimination, and a transit compartment model absorption. CKD-EPI and sex explained half of ofloxacin pharmacokinetic variability. For LSS, the 0, 1 h and 3 h sampling scheme resulted in the best approach both for BID and TID dosages (R(2) adjusted = 91.1% and 95.0%, outliers = 4.8% and 5.0%, respectively). PTA allows choosing the best drug and dosage according to various hypotheses. A simple 3-sample protocol (pre-dose, 1 h after intake and 3 h after intake) to estimate ofloxacin and levofloxacin AUC allows optimal drug dosage for the treatment of osteoarticular infections