Pseudomonas aeruginosa virulence attenuation by inhibiting siderophore functions.

Pseudmonas aeruginosa is a Gram-negative bacterium known to be ubiquitous and recognized as one of the leading causes of infections such as respiratory, urinary tract, burns, cystic fibrosis, and in immunocompromised individuals. Failure of antimicrobial therapy has been documented to be attributable due to the development of various resistance mechanisms, with a proclivity to develop additional resistance mechanisms rapidly. P. aeruginosa virulence attenuation is an alternate technique for disrupting pathogenesis without impacting growth. The iron-scavenging siderophores (pyoverdine and pyochelin) generated by P. aeruginosa have various properties like scavenging iron, biofilm formation, quorum sensing, increasing virulence, and toxicity to the host. As a result, developing an antivirulence strategy, specifically inhibiting the P. aeruginosa siderophore, has been a promising therapeutic option to limit their infection. Several natural, synthetic compounds and nanoparticles have been identified as potent inhibitors of siderophore production/biosynthesis, function, and transport system. The current review discussed pyoverdine and pyochelin's synthesis and transport system in P. aeruginosa. Furthermore, it is also focused on the role of several natural and synthetic compounds in reducing P. aeruginosa virulence by inhibiting siderophore synthesis, function, and transport. The underlying mechanism involved in inhibiting the siderophore by natural and synthetic compounds has also been explained. KEY POINTS: • Pseudomonas aeruginosa is an opportunistic pathogen linked to chronic respiratory, urinary tract, and burns infections, as well as cystic fibrosis and immunocompromised patients. • P. aeruginosa produces two virulent siderophores forms: pyoverdine and pyochelin, which help it to survive in iron-deficient environments. • The inhibition of siderophore production, transport, and activity using natural and synthesized drugs has been described as a potential strategy for controlling P. aeruginosa infection.

Thoracolumbar Sacral Orthosis for Spinal Fractures: What's the Evidence and Do Patients Use Them?

Introduction The general consensus regarding the non-operative management of thoracolumbar (TL) spine fractures revolves around the use of thoracolumbar spine orthosis (TLSO). The efficacy of TLSO bracing remains controversial within the current literature, with several studies showing that prolonged brace use is associated with diminished lung capacity, skin breakdown, and paraspinal muscular atrophy, with no significant difference in pain and functional outcomes between patients treated with or without TLSO. Aims The aim of this study was to identify the number of braces issued over the duration of the study and understand the cost implication, added length of stay, and patient satisfaction based on a questionnaire and reflect on whether we need to change our practice on the use of TLSO. Methods Data was collected retrospectively over an 18-month period with 75 patients being initially identified for the study. A total of 42 records were included in the final study after the application of inclusion/exclusion criteria. Patient-related outcomes were recorded through a questionnaire. Results Of the patients, 60% report not receiving adequate advice regarding the duration of treatment, 43% reported that the brace interfered with their activities of daily living (ADLs), and 73% came off the brace earlier than advised, with 60% of patients reporting that they would rather be without the brace if given the option. The average increase in length of stay waiting for bracing was three days, with the estimated cost incurred being approximately £114,000. Conclusion With equivalence between treatment with or without a brace, there is a need to rethink current practice and move toward a case-by-case, patient-centered approach to minimize costs and improve patient satisfaction.

Floating proximal interphalangeal joint (PIPJ) injury of the little finger in a child: A case report.

We present a floating PIPJ injury of the non-dominant hand little finger in a skeletally immature boy following a hyperextension injury while playing football. The injury was managed non-operatively with a successful outcome. This injury pattern can happen with trivial trauma in a child and could be easily missed. It is important to be aware of this pattern of injury and good functional outcomes are possible with non-operative treatment.

Correlation between MRI and Arthroscopy in Diagnosis of Shoulder Pathology.

INTRODUCTION: Shoulder pain can cause significant pain, discomfort and reduce the ability to perform activities of daily living, thus making it the third most common cause of musculoskeletal consultation. The current gold standard diagnostic investigation is arthroscopy. MRI is a proved sensitive and accurate non-invasive tool in investigating shoulder pathology, but false and misleading results are equally reported. AIM: The aim of the study is to compare the efficacy of MRI in diagnosing shoulder pathologies in comparison to arthroscopy, considering arthroscopy as the gold standard. MATERIALS AND METHODS: Thirty nine consecutive patients, between 18-80 years of age, presenting with chronic shoulder pain or instability of more than 6 weeks, or with clinical signs of impingement or tear were included in the study. MRI of the shoulder joint was done followed by shoulder arthroscopy. The data collected was analysed for the significant correlation between MRI of shoulder and arthroscopic findings by kappa statistics. RESULTS: Out of 39 patients, Rotator cuff (RC) tear was the most common pathology. MRI showed excellent sensitivity in the diagnosis of rotator cuff tears (0.91) and osteochondral defects (OCD), very good sensitivity for Bankart's lesion (0.8) and had poor sensitivity to detect SLAP tear (0.15). MRI was specific for all shoulder pathologies. MRI detected RC tears with kappa score of 0.73, Bankart's tear and OCD's with kappa score of 0.83 and 1.0 respectively and SLAP lesion with kappa score of 0.14. The accuracy of MRI was highest in diagnosing OCD's (1.0), followed by RC tear (0.9), Bankart's tear (0.9) and accuracy was least in diagnosing SLAP lesion (0.7). False negative results were more than false positives. CONCLUSION: The present study supports that MRI is effective in diagnosing rotator cuff tears, Bankart's tear and ostechondral defects but was not found to be helpful in diagnosing SLAP lesions. MRI and arthroscopy have complimentary roles in the diagnosis of shoulder pathology.

BBilateral Neglected Anterior Shoulder Dislocation with Greater Tuberosity Fractures.

INTRODUCTION: Shoulder dislocations are a very common entity in routine orthopaedic practice. Chronic unreduced anterior dislocations of the shoulder are not very common. Neurological and vascular complications may occur as a result of an acute anterior dislocation of the shoulder or after a while in chronic unreduced shoulder dislocation. Open reduction is indicated for most chronic shoulder dislocations. We report a case of neglected bilateral anterior shoulder dislocation with bilateral displaced greater tuberosity fracture. To the best of our knowledge, only a handful cases have been reported in literature with bilateral anterior shoulder dislocation with bilateral fractures. Delayed diagnosis/reporting is a scenario which makes the list even slimmer and management all the more challenging. CASE REPORT: We report a case of a 35-year-old male who had bilateral anterior shoulder dislocation and bilateral greater tuberosity fracture post seizure and failed to report it for a period of 30 days. One side was managed conservatively with closed reduction and immobilization and the other side with open reduction. No neurovascular complications pre or post reduction of shoulder were seen. CONCLUSION: Shoulder dislocations should always be suspected post seizures and if found should be treated promptly. Treatment becomes difficult for any shoulder dislocation that goes untreated for considerable period of time.

A rare case report of Patellar Osteochondroma.

INTRODUCTION: Osteochondroma (OC) is the most common benign tumor of the skeleton. However, patellar OC is very rare. Only five case reports have been published yet and only 1 after the year 1972. OCs grow during childhood through adolescence, but usually growing ends when the epiphyseal plates close. In an adult, the growth of an OC suggests the diagnosis of malignant transformation to a chondrosarcoma. However, enlargement of a patellar OC reported as benign after skeletal maturity is present in literature. CASE REPORT: We report the clinical and radiologic findings of a patellar OC in a 50-year-old female, with a 3-year progression of swelling, not painful, well-defined margins, normal skin, and no neurovascular deficits or functional impairment. The tumor was surgically resected, and histopathological examination did not show malignancy. After 2 years of follow-up, the patient has no complaints and no signs of recurrence. CONCLUSION: Patellar OCsare extremely rare with only a few reports published. It should be kept in mind that benign OCs can show symptomatic growth in skeletally mature patients without malignant transformation.