Diagnostic considerations in the clinical management of sudden swelling of the knee: a case report and review of the literature.

BACKGROUND: Reactive arthritis and septic arthritis rarely present concomitantly in the same joint and patient. Reactive arthritis presenting after coronavirus disease 2019 is also exceedingly rare, with less than 30 cases reported thus far. Less common pathogens such as Clostridium difficile have been reported to cause reactive arthritis, especially in patients with a positive human leukocyte antigen B27, and therefore should be considered in diagnostic algorithms. The aim of this case report is to highlight the difficulties and precautions in discerning and diagnosing patients presenting with sudden swelling of the knee. CASE PRESENTATION: We report the case of a 70-year-old Caucasian male with a recent history of coronavirus disease 2019 upper respiratory infection and diarrhea and negating trauma, who presented with a swollen and painful knee. Pain and swelling worsened and inflammatory parameters increased after an intraarticular corticosteroid injection. The patient was therefore treated with arthroscopic lavage and intravenous antibiotics for suspected septic arthritis. Synovial fluid and synovium samples were taken and sent for microbiological analysis. Synovial fluid cytology showed increased leukocytes at 10,980 × 106/L, while polymerase chain reaction and cultures came back sterile. Clostridium difficile toxin was later detected from a stool sample and the patient was treated with oral vancomycin. The patient was tested for the presence of human leukocyte antigen B27, which was positive. We present a review of the literature about the challenges of distinguishing septic from reactive arthritis, and about the mechanisms that predispose certain patients to this rheumatological disease. CONCLUSIONS: It is still a challenge to differentiate between septic and reactive arthritis of the knee, and it is even more challenging to identify the exact cause of reactive arthritis. This case report of a human leukocyte antigen-B27-positive patient highlights the necessity of contemplating different, less common causes of a swollen knee joint as a differential diagnosis of an apparent septic infection, especially in the coronavirus disease 2019 era. Treating the patient for septic arthritis prevented any possible complications of such a condition, while treating the C. difficile infection contributed to the substantial relief of symptoms.

Multidisciplinary Team Led by Joint Surgeons to Rapidly Identify Spondyloarthritis.

Context: Spondyloarthritis (SpA) is a group of chronic, inflammatory, rheumatic diseases of which axial SpA and peripheral SpA are the two main types. Patients that predominantly have manifestations of axSpA may have additional peripheral-arthritis symptoms, and vice versa. For these hard-to-diagnose SpA patients, symptoms can be nonspecific and difficult to identify, making it easy to miss a diagnosis or misdiagnosis patients, resulting in disability. Objective: The study intended to evaluate the value of a multidisciplinary team (MDT) led by the joint surgeons to rapidly identify spondyloarthritis (SpA). Design: The research team designed a controlled study that analyzed the clinical data of patients with spondyloarthritis. Setting: The study was conducted in the Department of Joint Surgery at Shandong Second Provincial General Hospital in Jinan, China. Participants: Participants were 113 SpA patients at the hospital between January 2019 and January 2020. Intervention: he research team divided participants into an intervention group, the MDT group that used that model to diagnose 83 participants and the control group with 30 participants, for whom diagnoses occurred using the conventional diagnostic model. Outcome Measures: The research team collected data on participants' number of visits and number of departments visited as well as determined the amount of time that elapsed before a diagnosis occurred. The team also measured C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR) and the scores on the Bath Ankylosing Spondylitis Disease Activity Index (BASDAI), and Bath Ankylosing Spondylitis Functional Index (BASFI) at baseline and after 3 months and 6 months treatment. Results: In the MDT group, diagnoses included: (1) axial SpA (axSpA)-73 participants, and (2) peripheral SpA-10 participants, including three with reactive arthritis, two with uveitis, and five with psoriatic arthritis. Eight participants in that group were HLA-B27 positive, and 14 had complications from a latent tuberculosis infection. In the control group, diagnoses included: (1) axSpA-25 participants; and (2) peripheral SpA-5 participants, including three with psoriatic arthritis and two with reactive arthritis. Six participants in that group were HLA-B27 positive and four had complications from a latent tuberculosis infection. The number of visits, number of departments visited, and time to diagnosis in the MDT group were significantly lower than those in the control group (P < .001). After three and six months of treatment, the MDT group's CRP, ESR, BASDAI, and BASFI were significantly lower than those at baseline (P < .001). Conclusions: The MDT model of spondyloarthritis led by joint surgeons was accurate and efficient, allowing the medical personnel to quickly identify and intervene in SpA and provide effective treatment for patients. It's a diagnosis and treatment model worthy of promotion.

Association of Corticosteroid Treatment With Outcomes in Pediatric Patients With Bacterial Meningitis: A Systematic Review and Meta-analysis of Randomized Controlled Trials.

PURPOSE: Controversy has arisen among the overall benefit and potential risks in the use of corticosteroids for the treatment of pediatric bacterial meningitis. This systematic review and meta-analysis aims to provide evidence of the use of corticosteroids in the treatment of bacterial meningitis in children. METHODS: Electronic databases (PubMed, Embase, Cochrane Central Register of Controlled Trials, and other databases) were searched from inception until March 9, 2021. Randomized clinical trials focused on corticosteroids as adjuvant therapy in pediatric bacterial meningitis were considered eligible. The primary outcomes were hearing loss and neurologic sequelae. Secondary outcomes were mean days before resolution of fever, mortality, secondary fever, and reactive arthritis. Fixed- or random-effects models were used to evaluate the association between corticosteroids therapy and outcomes by calculating risk ratios (RRs) and mean differences (MDs) with corresponding 95% CIs. Two independent reviewers completed citation screening, data extraction, and risk assessment. FINDINGS: Twenty-nine studies with 3433 patients were included. An obvious benefit was found in the treatment of corticosteroids in hearing loss (RR = 0.62; 95% CI, 0.47-0.81; I² = 17%; P = 0.0006). No benefit was found in the rate of neurologic sequelae. However, obvious benefit was found in the low-dosage subgroup (0.6 mg/kg per day) (RR = 0.60; 95% CI, 0.47-0.77; I² = 0%; P < 0.0001) but not in the high-dosage subgroup (0.8 mg/kg per day). An increasing rate of secondary fever was found when using corticosteroids (RR = 1.29; 95% CI, 1.10-1.51; I² = 13%; P = 0.001). Corticosteroids could significantly decrease the mean days before resolution of fever (MD = -1.48; 95% CI, -1.79 to -1.17; I² = 84%, P < 0.00001). No difference was found in the rate of mortality and reactive arthritis. IMPLICATIONS: The findings of this study suggest that the administration of corticosteroids is associated with reduced hearing loss and neurologic sequelae especially in children using a low dose of corticosteroids. Benefits also included a reduction in the mean number of days before resolution of fever.

Foot rash and joint pain.

An untreated infection led to a series of unusual signs and symptoms that included difficulty walking.

Correlations between infection patterns and eye damage in reactive arthritis.

The purpose of the study was to correlate the infectious patterns (urogenital, enteral) with ocular manifestations, such as conjunctivitis or acute anterior uveitis in reactive arthritis (ReA). The transversal, observational study was conducted in the Clinic of Rheumatology, University of Medicine and Pharmacy of Craiova, Romania, during the period 2012-2015, and included 112 patients. They were divided into three groups, as follows: Group I (52 ReA cases), Group II (30 other spondyloarthritis cases), Group III (40 osteoarthritis cases). Ophthalmologic screening was performed, together with the detection of human leukocyte antigen B27 (HLA-B27) and the infectious trigger. Within Group I, 42 (80.76%) patients presented genitourinary infections (78.57% Chlamydia trachomatis, 21.43% Ureaplasma urealyticum), 10 (19.23%) patients presented enteral infections (Yersinia enterocolitica and Salmonella). Compared with the other two groups, the patients from the first group were documented with more conjunctivitis episodes. Although anterior uveitis is more common in ankylosing spondylitis (AS), in the present study more cases were identified in Group I (11.9%) than in Group II (6.67%) and no case were recorded in Group III. Most of patients from Group I were HLA-B27 positive. The etiologic profile of ocular manifestations in ReA is dominated by genitourinary infections - C. trachomatis and U. urealyticum, respectively. Cases of recurring uveitis are associated with elevated levels of anti-immunoglobulin A (IgA).

Intrathecally injected tramadol reduces articular incapacitation and edema in a rat model of lipopolysaccharide (LPS)-induced reactive arthritis.

AIMS: Intrathecal injection of morphine presents analgesic and antiedematogenic effects in rats. However, it is unknown whether tramadol, which possess a mixed mechanism of action, can also produce analgesic and antiedematogenic effects similarly. MAIN METHODS: Male Wistar rats received carrageenan and LPS in the right knee joint. Tramadol (10 µg) was injected intrathecally 20 min before articular LPS injection. Incapacitation and articular edema were measured 5 h after LPS stimulation. Synovial fluid was collected for leukocyte counting and western blot analysis. Whole joint and lumbar spinal cord were also collected for histology and immunohistochemistry, respectively. Intrathecal pretreatments groups were with the NKCC1 blocker bumetanide, TRPV1 agonist resiniferatoxin, µ-opioid receptor antagonist CTOP and serotonergic neurotoxin 5,7-DHT, all previously to tramadol. KEY FINDINGS: Tramadol treatment caused the reduction of incapacitation and edema. It also reduced c-Fos protein expression in the spinal cord dorsal horn and slightly reduced TNF-α levels in synovial fluid, but neither reduced cell migration nor tissue damage. Bumetanide and resiniferatoxin prevented the analgesic and antiedematogenic effects of tramadol. CTOP prevented the analgesic and the antiedematogenic effects, but 5,7-DHT prevented only tramadol-induced analgesia. SIGNIFICANCE: Spinal NKCC1 cotransporter and peptidergic peripheral afferents seem to be important for the analgesic and antiedematogenic effects of tramadol, as well as µ-opioid receptor. However, the monoamine uptake inhibition effect of tramadol seems to be important only to the analgesic effect.

Acute onset of psoriatic spondyloarthritis as a new manifestation of post-streptococcal reactive arthritis: a case series.

Streptococcus is well associated with a myriad of inflammatory diseases. Among others, this bacterium is linked to the triggering of psoriasis and to post-streptococcal reactive arthritis (PSRA), an arthritis which is typically confined to peripheral joints. Three patients who developed acute psoriatic spondyloarthritis (SpA) following a recent streptococcal infection are described in this article. We searched the existing literature for cases of axial involvement in PSRA and reviewed the association between streptococcal infection and psoriasis or psoriatic arthritis )PsA). In all patients, psoriatic SpA occurred within 7-10 days of a confirmed streptococcal infection. The main presenting syndrome was inflammatory back pain with evidence of acute axial spondyloarthritis on magnetic resonance imaging. One patient had guttate psoriasis, the second patient developed pustular psoriasis, and the third patient had exacerbation of pustular palmoplantar psoriasis. Two patients required treatment with tumor necrosis factor alpha (TNF-α) blockers. Axial involvement in PSRA is very rare. A potential association of streptococcal infection and development of PsA has been explored in several articles. However, to the best of our knowledge, acute psoriatic SpA as a manifestation of PSRA has yet to be described. Acute psoriatic SpA should be considered in the differential diagnosis of new-onset inflammatory back pain followed by psoriasis in young adults who had a recent throat infection. KEY POINTS: • Our case series describes three cases of acute psoriatic spondyloarthritis that occurred within 7--10 days of a confirmed streptococcal infection and progressed to full blown chronic disease. • Acute psoriatic spondyloarthritis as a manifestation of post streptococcal reactive arthritis should be considered in the differential diagnosis of new onset inflammatory back pain followed by psoriasis in young adults who had a recent throat infection.

Acute severe monarthritis: a rare manifestation of scrub typhus.

Scrub typhus caused by Orientia tsutsugamushi is an important cause for fever of unknown origin in endemic areas including India. The vasculitis associated with the disease leads to a variety of clinical manifestations. However, the joint involvement is quite rare and not reported in children. We present severe arthritis of hip joint associated with scrub typhus causing a diagnostic and management challenges in a 4-year-old girl.

Atypical Articular Presentations in Indian Children With Rheumatic Fever.

BACKGROUND: The objective of the study was to describe the clinical characteristics of atypical articular presentations during the initial outbreak and recurrence in patients with acute rheumatic fever (ARF) in the paediatric age group. METHODS: This was a retrospective, observational study conducted between January 2012 and December 2014 on all suspected cases of acute rheumatic fever (ARF) fulfilling either WHO 2004 or Australian guidelines with atypical articular manifestations ie, presence of at least one of the following features: duration of symptoms more than 3 weeks; monoarthritis/arthralgia; involvement of small joints of hand and feet and/or cervical spine and/or hip joint; and, not responding to salicylates in 1 week. RESULTS: 'Atypical' pattern was present in 63% (39/62) of patients with articular manifestations, of which arthralgia was a common manifestation (57%). Polyarticular afflictions were predominately non-migratory (additive) in both atypical (74%; 29/39) and typical (82%; 18/23) groups. Monoarticular (33%) affliction of the joints constituted a significant disease manifestation. Time from onset to diagnosis was >3 weeks in 79% of patients while small joints involvement and axial joint involvement occurred in half of the cases (51%). Inadequate response to NSAIDs was found in three (7%) cases. CONCLUSION: Atypical manifestations in ARF may well be mistaken for a connective tissue disorder, post streptococcal reactive arthritis and septic arthritis. Physicians should be made aware of these features to prevent diagnostic dilemma, and to effect institution of appropriate management including penicillin prophylaxis.

Bilateral interstitial keratitis with anterior stromal infiltrates associated with reactive arthritis.

A previously healthy 48-year-old man presented with a 1-week history of migrating polyarthropathy preceded by a viral illness, dysuria and bilateral red eyes. Ocular examination revealed anterior and interstitial stromal keratitis. He was systemically well but had raised erythrocyte sedimentation rate and C reactive protein and was positive for human leucocyte antigen B27 on extensive infective, rheumatological and autoimmune investigations. Although the exact triggering pathogen was not identified, clinical findings were consistent with reactive arthritis. Bilateral interstitial keratitis is a rare manifestation of reactive arthritis which, along with the anterior stromal keratitis, responded well to topical prednisolone sodium phosphate 0.5%. Systemic joint symptoms improved on oral sulfasalazine, non-steroid anti-inflammatory agent and low-dose prednisolone.

Reactive Arthritis.

Reactive arthritis is classified as a spondyloarthropathy. Current concepts of disease suggest an infectious trigger, followed by inflammatory arthritis. Several mechanisms have been proposed to explain the interaction of host susceptibility and microorganism. Diagnosis relies on a compatible clinical syndrome and microbiologic confirmation of the pathogen. Antibiotic therapy seems useful in Chlamydia-triggered arthritis. The role of antibiotics in arthritis triggered by enteric pathogens is less clear. The role of tumor necrosis factor alpha inhibitors in therapy is evolving. Many patients have a course limited to a few months, but others experience extraarticular disease and more prolonged courses.

Painful Acute Corneal Ulceration and Anterior Stromal Keratitis in an Adolescent With Reactive Arthritis.

Reactive arthritis is occasionally associated with conjunctivitis and uveitis, but rarely keratitis. The authors describe a patient with paracentral anterior stromal keratitis with overlying epithelial erosion and multiple satellite subepithelial infiltrates. The initial appearance and the severe pain were suggestive of an infectious process. Recovery was rapid following introduction of topical steroid, with features suggesting an immune process in the recovery phase. The authors suggest that a history of arthritis and/or recent enteritis should be sought in the work-up of an atypical keratitis with or without epithelial defect. [J Pediatr Ophthalmol Strabismus. 2016;53:e61-e63.].

Bilateral disciform keratitis in Reiter's syndrome.

Reiter's syndrome is commonly associated with conjunctivitis and rarely with uveitis. Bilateral disciform keratitis at presentation is a very rare manifestation in Reiter's syndrome. A 13-year-old boy developed bilateral disciform keratitis with oligoarthritis following an episode of conjunctivitis. In addition he had suspected bacterial keratitis with hypopyon in the left eye as a possible secondary infection of an epithelial defect that is a feature of Reiter's keratitis. Empirical treatment with intensive topical antibiotics as a therapeutic trial completely resolved the hypopyon and the disciform keratitis settled with topical steroid treatment. The patient achieved a best corrected vision of 20/20 in both the eyes 6 weeks after the treatment. Bilateral disciform keratitis can occur as a complication of Reiter's syndrome. Also the possibility of secondary infection of the epithelial defect needs to be borne in mind.