BackgroundThe unsuccessful treatment of prosthetic joint infection (PJI) with two-stage revision leads to infection recurrence. The objectives of the study were to assess the clinical and demographic characteristics of patients with polymicrobial PJI, and to evaluate the role of the microbial profile involved in PJI in the risk of infection recurrence after the first step of two-stage revision surgery.Materials and methodsA retrospective analysis of 189 cases of culture-positive PJI following total hip replacement over a 5-year period was performed. The demographic characteristics of patients, clinical symptoms, microbiology cultures of intraoperative biopsies, laboratory values of C-reactive protein (CRP), white blood cell count and erythrocyte sedimentation rate were analyzed. Patients were divided into two groups—135 with monomicrobial and 54 with polymicrobial infection.ResultsOf all patients, 68.9 % in the monomicrobial and 83.3 % in the polymicrobial group had a body mass index >25 kg/m2 (p = 0.05). The median CRP values were 5.7 mg/L (IQR 4.0–10.0 mg/L) in the monomicrobial compared to 8.8 mg/L (IQR 5.0–27 mg/L) in the polymicrobial group (p = 0.01). The percentage of successful outcomes was 27.8 % in patients with microbial associations (p < 0.0001). Gram-negative pathogens caused polymicrobial PJI in 61.5 % of cases with infection recurrence (OR 4.4; 95 % CI 1.18–16.37; p = 0.03).ConclusionsOverweight and obese patients or those with elevated CRP had a greater risk of polymicrobial PJI. They were predisposed to recurrence of infection after the first step of two-stage revision. An unsuccessful outcome was more likely in cases with polymicrobial infection compared to those with monomicrobial infection. In addition, the presence of multidrug-resistant strains of Gram-negative bacteria substantially increased the risk of PJI treatment being unsuccessful.Level of evidenceLevel III, therapeutic study.

Efficacy of the first step of two-stage revision was 64.1 %. Placement of either articulating or non-articulating spacers did not influence recovery from PJI. Laboratory values of ESR, CRP, BMI and the type of previous surgery were identified as main factors that affect outcomes of the two-stage procedure. A prognostic model with the calculation of a total risk score for PJI recurrence was developed.

Current prophylactic and hygienic measures notwithstanding, implant-related infection remains among leading reasons for failure in orthopaedics and trauma surgery, resulting in extremely high social and economic costs. Various antibacterial coating technologies have been proven safe and effective both in preclinical and in clinical settings and able to reduce post-surgical infections up to 90%, depending on the type of the coating and on the experimental setup. In spite of this findings, the widespread use of these technologies is still limited by several factors. After reviewing the latest evidence on currently available antibacterial coatings, an algorithm is proposed to calculate the impact of the delayed introduction of these technologies in the clinical practice. When applied to joint arthroplasties, our calculator shows that each year of delay to implement an antibacterial coating, able to reduce post-surgical infection by 80% at a final user's cost price of €600, causes an estimated 35 200 new cases of periprosthetic joint infection in Europe and additional annual hospital costs of approximately €440 million. Faster and more affordable regulatory pathways for antibacterial coating technologies and an adequate reimbursement policy for their clinical use appear a feasible solution to mitigate the impact of implant-related infections and may benefit patients, healthcare systems, and related research. реферат несмотря на современные достижения профилактики и гигиены, имплант-ассоциированная инфекция остается одной из основных причин несостоятельных результатов ортопедических и травматологических вмешательств, что приводит к чрезвычайно высоким социальным и экономическим издержкам. Различные технологии антибактериального покрытия имплантатов зарекомендовали себя как безопасное и эффектив-

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To analyze principal parameters of sagittal spinopelvic relations in patients with hip-spine syndrome. Material and Methods. Clinical examination protocols and X-ray images of 42 patients with unilateral or bilateral grade 3 hip arthrosis and vertebrogenic pain syndrome were analyzed. Four principal sagittal parameters of spino-pelvic balance were measured, statistically processed, and compared with normal values. Results. The positive correlation was found between the sacral slope and the lumbar lordosis. Normal spino-pelvic relations were noted in 6 (14.3 %) cases, an excessive anteversion of the pelvis with compensatory hyperlordosis-in 34 (81.0 %), and retroversion of the pelvis with flattening of the lumbar lordosis-in 2 (4.7 %) cases. Conclusion. Changes in hip joints cause compensatory responses of the spine. Unilateral or bilateral hip joint arthrosis in most cases leads to excessive anteversion of the pelvis and hyperlordosis of the lumber spine with overloading of its segments. Another variant of compensatory posture is retroversion of the pelvis with a loss of lumbar lordosis. Both types of compensatory vertical posture are associated with vertebrogenic pain syndrome and degenerative-dystrophic changes in the spine.