Social Preferences, Skill Segregation and Wage Dynamics

We study the earning structure and the equilibrium asignment of workers to firms in a model in which workers have social preferences, and skills are perfectly substitutable in production. Firms offer long-term contracts, and we allow for frictions in the labour market in the form of mobility costs. The model delivers specific predictions about the nature of worker flows, about the characteristic of workplace skill segregation, and about wage dispersion both within and cross firms. We shows that long-term contracts in the resence of social preferences associate within-firm wage dispersion with novel "internal labour market" features such as gradual promotions, productivity-unrelated wage increases, and downward wage flexibility. These three dynamic features lead to productivity-unrelated wage volatily within firms.Publicad

Instagram Outperforms Twitter in Driving Social Media Engagement Among Sports Medicine Orthopaedic Surgeons

Purpose: To determine the content posted by sports medicine orthopaedic surgeons on Instagram and Twitter and to evaluate the associated engagement. Methods: Data were collected from sports medicine orthopaedic surgeons’ Instagram profiles and Twitter profiles between December 2020 and June 2022. The median number of total number of likes, comments, and retweets was calculated. The content of posts from both platforms was divided into the following categories: personal life, research, patient testimony, day in the life, pathway to becoming a physician, clinical cases, medical facts, and team coverage. Results: Data from 71 Instagram profiles and 39 Twitter profiles were used in this study. A total of 1,193 posts were identified on Instagram and 1,284 posts were identified on Twitter. The personal life category had the greatest number of posts on Instagram (303, 25.4%), whereas the medical facts category had the greatest number of posts on Twitter (251, 19.5%). Pathway to becoming a physician had the greatest median number of likes on both Instagram (97.5, range 48-2,467) and Twitter (19, range 0-50) and the greatest median number of comments on Instagram at 16 (range 1-203). The team coverage category on Instagram had the greatest percentage of likes per follower at 9.9%. A significantly greater percentage of orthopaedic surgeons posted about day in the life content, medical facts, and research on Twitter in comparison with Instagram. Instagram resulted in significantly more social media engagement than Twitter in all 8 categories (P < .05). Conclusions: Instagram resulted in significantly more social media engagement across all categories in comparison with Twitter with team coverage, personal life, and pathway to becoming a physician being the most popular categories. Clinical Relevance: The information learned in this study may help sports surgeons understand how they may best utilize social media to engage with others and enhance their clinical practice

Systematic Review of Intra-Articular Use of Antibiotics and Antiseptic Irrigation and their Association with Chondrolysis

Category: Arthroscopy; Other Introduction/Purpose: Intra-articular antibiotics have been proposed as a treatment for septic arthritis to allow for high local concentrations without subjecting a patient to systemic therapy and its associated toxicity/side effects. However, there is concern for chondrotoxicity with intra-articular use of antimicrobials and antiseptic solutions in high concentrations. The purpose of this systematic review was to evaluate the intra-articular use of antibiotics and antiseptic solutions, determine their association with chondrolysis following in vitro or in vivo administration, and identify the dosages at which they become chondrotoxic. Methods: A systematic review was conducted following the PRISMA guidelines through PubMed, Clinical Key, OVID, and Google Scholar. Studies were included if they were written in the English language and evaluated for chondrotoxicity following in vitro or in vivo intra-articular exposure to an antibiotic and antiseptic solutions. All agents, study characteristics, and conclusions were extracted and summarized. Results: The initial search resulted in 228 studies, with 36 meeting full inclusion criteria. Overall, chondrotoxicity was not associated with 7 out of 24 (29%) included agents: minocycline, tetracycline, chloramphenicol, teicoplanin, pefloxacin, linezolid, polymyxin-bacitracin. Inconsistent results were noted with 8 (33%) agents: doxycycline, ceftriaxone, gentamicin, vancomycin, ciprofloxacin, ofloxacin, chlorhexidine, and povidone iodine. Chondrotoxicity was evident with 9 (38%) agents, all of which were also dose-dependently chondrotoxic based on reported estimated half maximal inhibitory concentrations (est.IC50): amikacin (est. IC50 = 0.31-2.74 mg/mL), neomycin (0.82 mg/mL), cefazolin (1.67-3.95 mg/mL), ceftazidime (3.16-3.59 mg/mL), ampicillin- sulbactam (8.64 - >25 mg/mL), penicillin (11.61 mg/mL), amoxicillin (14.01 mg/mL), imipenem (>25 mg/mL), and tobramycin (>25 mg/mL). Additionally, certain studies reported chondroprotective effects of doxycycline and minocycline. Conclusion: This systematic review identified antimicrobial and antiseptic agents that may be used in the treatment of septic arthritis. The following agents should be avoided due to their dose-dependent chondrotoxic effects: amikacin, neomycin, cefazolin, ceftazidime, ampicillin-sulbactam, penicillin, amoxicillin, imipenem, and tobramycin. Further studies, especially in human models, are needed to clarify the safety of these medications for human intra-articular use