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Paper of the week: Humidity a potential risk factor for prosthetic joint infection in a tropical Australian hospital.

Paper of the week: Humidity a potential risk factor for prosthetic joint infection in a tropical Australian hospital. Armit D, Vickers M, Parr A, Van Rosendal S, Trott N, Gunasena R, Parkinson B. ANZ J Surg. 2018 Dec;88(12):1298-1301. doi: 10.1111/ans.14916. Epub 2018 Oct 24.

Summary and Editorial by Sreeram Penna and Javad Parvizi

This study aims to determine the role of humidity as a risk factor for the development of prosthetic joint infection (PJI) in total knee replacement patients. In this single-center retrospective study researchers looked at the incidence of deep PJI and correlated with daily weather data. Deep PJI was diagnosed using the Australian Commission on Safety and Quality in Health Care criteria for deep incisional organ space infection. Weather variables used for analysis was relative humidity and apparent temperature on the day of the primary procedure. Results showed humidity more than 60% (OR 1.4) and apparent temperature more than 30-degree centigrade (OR 2.4) are possible potential risk factors for the development of deep PJI. However, these variables were not statistically significant.

A Study by Parkinson et al. based on Australian Orthopaedic Association National Joint Replacement Registry, have shown higher PJI incidence in tropical regions (0.73%) compared to the non-tropical areas (0.37%). [1] Their results also showed seasonal variation in the tropical areas with a higher incidence in summer/fall (0.98%) compared to winter/spring (0.51%). Hot and humid weather increases sweating and provide conditions to bacterial growth which might explain the reason behind the increase in infection. One issue with the above study is that weather variables were recorded on the day of surgery, where the patient is indoors, and air conditioning would provide a constant stable environment inside the hospital.

Reference

[1] Parkinson B, Armit D, McEwen P, Lorimer M, Harris IA. Is Climate Associated With Revision for Prosthetic Joint Infection After Primary TKA? Clin Orthop Relat Res 2018;476:1200–4. doi:10.1007/s11999.0000000000000144.

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Paper of the week: Cutibacterium acnes and the shoulder microbiome.

Paper of the week: Cutibacterium acnes and the shoulder microbiome. Qiu B, Al K, Pena-Diaz AM, Athwal GS, Drosdowech D, Faber KJ, Burton JP, O’Gorman DB. J Shoulder Elbow Surg. 2018 Oct;27(10):1734-1739. doi: http://dx.doi.org/10.1016/j.jse.2018.04.019.

Summary and Editorial by Dr. Sreeram Penna and Dr. Surena Namdari

The aim of this study is to determine if there is a microbiome in the native shoulder joint and whether Cutibacterium acnes (previously known as Propionibacterium acnes), the most common cause of shoulder infections, is part of this microbiome. The indolent nature of Cutibacerium acnes (C. acne) along with lack of significant biomarker response makes it a difficult bacteria to manage. Also, its presence in culture samples in cases with negative joint infection leads to a theory that this bacterium could be commensal in the native joint.

In this study, researchers collected tissue samples from patients undergoing primary open shoulder arthroplasty with no history of previous infection. Twenty-three patients were included in the study. Researchers collected tissue samples from skin, subcutaneous fat, anterior edge of the supraspinatus tendon, middle glenohumeral ligament, and humeral head. A total of 136 samples were collected. Samples were then analyzed using 16s RNA sequencing to identify operational taxonomic units. After careful removal of contamination, results showed that 53 samples showed positive for microbial genome and most abundant bacterial type was Acinetobacter and Oxalobacteraceae. C. acnes was only identified in one skin sample. Anatomical structure wise 74% of supraspinatus tendon samples and 49% of joint capsule samples were positive for a microbial genome.

This study shows that the native shoulder joint is not completely sterile, and bacteria are present. Interestingly C. acnes is not present in the native shoulder joint. Advances in the genomic analysis are making it easier to identify bacterial species and to characterize the microbial genome. Studies of 16s RNA sequencing remain limited by both the risk of contamination and the risk of identifying dead bacteria [1,2]. Further research is needed on the impact of oral and gut microbial load on tissue microbiome as it is well known that transient bacteremia can occur following activities like oral brushing and can lead to tissue seeding.[3,4]

References

[1]    Salter SJ, Cox MJ, Turek EM, Calus ST, Cookson WO, Moffatt MF, et al. Reagent and laboratory contamination can critically impact sequence-based microbiome analyses. BMC Biology 2014;12:87. doi:10.1186/s12915-014-0087-z.

[2]    Weiss S, Amir A, Hyde ER, Metcalf JL, Song SJ, Knight R. Tracking down the sources of experimental contamination in microbiome studies. Genome Biology 2014;15:564. doi:10.1186/s13059-014-0564-2.

[3]    Maharaj B, Coovadia Y, Vayej AC. An investigation of the frequency of bacteraemia following dental extraction, tooth brushing and chewing. Cardiovasc J Afr 2012;23:340–4. doi:10.5830/CVJA-2012-016.

[4]    Lockhart Peter B., Brennan Michael T., Sasser Howell C., Fox Philip C., Paster Bruce J., Bahrani-Mougeot Farah K. Bacteremia Associated With Toothbrushing and Dental Extraction. Circulation 2008;117:3118–25. doi:10.1161/CIRCULATIONAHA.107.758524.

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Paper of the week: Culturing periprosthetic tissue in blood culture bottles results in isolation of additional microorganisms.

Title: Culturing periprosthetic tissue in blood culture bottles results in isolation of additional microorganisms.  van den Bijllaardt W, van der Jagt OP, Peijs M, Janssens M, Buiting AG, Reuwer AQ. European Journal of Clinical Microbiology & Infectious Diseases. 2018 Epub. DOI: 10.1007/s10096-018-3420-6

Summary and Editorial by  Dr. Marjan Wouthuyzen-Bakker and Dr. Sreeram Penna

The aim of this prospective clinical validation study was to evaluate if there is an added diagnostic value to culturing periprosthetic tissues in blood culture bottles (BCB) in addition to standard conventional cultures in diagnosing periprosthetic joint infection (PJI). The study was conducted over a 12-month period with 113 episodes in 90 patients. The researchers utilized the Infectious Diseases Society of America (IDSA) criteria for PJI as a gold standard in assessing sensitivity and specificity of culture. In the studied cohort, 45 patients met the IDSA criteria for PJI, and of these cases, 34 were acute infections. The main finding of this study was that periprosthetic tissue cultures in BCB led to the isolation of additional microorganisms in 30% of cases and increased the sensitivity for PJI diagnosis with 10% compared to standard cultures in agar and broth. Moreover, in 9 cases, virulent microorganisms were cultured in BCB only.

Culture-negative PJIs remains a concern for physicians treating patients with PJIs and in the last decade, many studies have been performed to improve culture techniques in order to increase culture yield. Several studies already demonstrated the clinical benefit of culturing synovial fluid and sonication in fluid in BCB by increasing the diagnostic yield and reducing the time to detection[1,2], but only a few studies evaluated its potential benefit for tissues samples. Peel et al., demonstrated an increased sensitivity of inoculating tissue samples in BCB compared to conventional cultures. Its benefit was most evident in patients with chronic infections.[3] In addition, Minassian et al. demonstrated a shorter time to positivity in which the majority of microorganisms were identified within 3 days.[2] This paper of the week conducted by van den Bijllaardt et al. adds to the current literature. In the studied cohort, four cases would be missed as infected if only clinical, serological and conventional cultures findings were used to diagnose PJI and multiple microorganisms would remain undetected with conventional methods. As in the current study, synovial fluid was not inoculated in BCB and sonication was not performed, it is unclear whether the inoculation of tissue samples in BCB will add to these methods. A recent study by Yan et al. could not find a significant difference in sensitivity of tissue culture in BCBs compared to sonicate fluid culture[4], and the use of BCB for tissue samples could be an alternative approach for centers that do not apply sonication.

References

[1]    Portillo ME, Salvadó M, Trampuz A, Siverio A, Alier A, Sorli L, et al. Improved diagnosis of orthopedic implant-associated infection by inoculation of sonication fluid into blood culture bottles. J Clin Microbiol 2015;53:1622–7. doi:10.1128/JCM.03683-14.

[2]    Minassian AM, Newnham R, Kalimeris E, Bejon P, Atkins BL, Bowler IC. Use of an automated blood culture system (BD BACTECTM) for diagnosis of prosthetic joint infections: easy and fast. BMC Infect Dis 2014;14:233. doi:10.1186/1471-2334-14-233.

[3]    Peel TN, Dylla BL, Hughes JG, Lynch DT, Greenwood-Quaintance KE, Cheng AC, et al. Improved Diagnosis of Prosthetic Joint Infection by Culturing Periprosthetic Tissue Specimens in Blood Culture Bottles. MBio 2016;7. doi:10.1128/mBio.01776-15.

[4]    Yan Q, Karau MJ, Greenwood-Quaintance KE, Mandrekar JN, Osmon DR, Abdel MP, et al. Comparison of Diagnostic Accuracy of Periprosthetic Tissue Culture in Blood Culture Bottles to That of Prosthesis Sonication Fluid Culture for Diagnosis of Prosthetic Joint Infection (PJI) by Use of Bayesian Latent Class Modeling and IDSA PJI Criteria for Classification. Journal of Clinical Microbiology 2018;56:e00319-18. doi:10.1128/JCM.00319-18.

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2018 Final ICM Document

Hi all,  final 2018 ICM document is available on website and ICM Philly apps.

Please visit the following link to access it

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Paper of the week: Alpha Defensin, Leukocyte Esterase, C-reactive Protein, and Leukocyte Count in Synovial Fluid for Pre-operative Diagnosis of Periprosthetic Infection.

Alpha Defensin, Leukocyte Esterase, C-reactive Protein, and Leukocyte Count in Synovial Fluid for Pre-operative Diagnosis of Periprosthetic Infection.
Elena De Vecchi, Carlo Luca Romanò, Roberta De Grandi, Laura Cappelletti, Francesca Villa, and Lorenzo Drago.
International Journal of Immunopathology and Pharmacology 32 (2018): 205873841880607.
doi:10.1177/2058738418806072.