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Background: The expansion of indications for reverse total shoulder arthroplasty (RTSA) has resulted in a rapid increase in the incidence of subsequent revision procedures. The purpose of this study was to identify the incidence and risk factors for re-revision shoulder arthroplasty after first revision RTSA., Methods: We retrospectively queried our institutional shoulder arthroplasty database of prospectively collected data from 2003 to 2019. To assess revision implant survival, patients were censored on the date of re-revision surgery or, if the revision arthroplasty was not revised, at the most recent follow-up or their date of death. Patients with a prior infection, concern for infection at the time of revision, antibiotic spacer, or oncologic indication for primary arthroplasty were excluded. A total of 186 revision RTSAs were included, with 32 undergoing re-revision shoulder arthroplasty. The Kaplan-Meier method and bivariate Cox regression were used to assess the relationship of patient and surgical characteristics on implant survivorship. Multivariate Cox regression was performed to identify independent predictors of re-revision., Results: Re-revision shoulder arthroplasty was most commonly performed for instability (34%), infection (28%), and glenoid loosening (19%). Overall re-revision rates at 6 months (7%), 1 year (9%), and 2 years (13%) were relatively low; however, the rate of re-revision increased at 5 years (35%). Men underwent re-revision more often than women within the first 6 months after revision RTSA (12% vs. 2%; P = .025), but not thereafter. On multivariate analysis, increased estimated blood loss was associated with a greater risk of undergoing re-revision shoulder arthroplasty (hazard ratio: 41.16 [3.34-506.50]; P = .004)., Conclusion: The rate of re-revision after revision RTSA is low in the first 2 years postoperatively (13%) but increases to 35% at 5 years. Increased estimated blood loss, which may reflect greater operative complexity, was identified as a risk factor that may confer an increased chance of re-revision after revision RTSA. Knowledge of risk factors for re-revision after revision RTSA can aid surgeons and patients in preoperative counseling., (Published by Elsevier Inc.)

Purpose: Pediatric motocross injuries occur frequently and with significant associated morbidity; however, data are limited regarding injury occurring during competition. North Central Florida hosts an annual motocross competition with numerous pediatric competitors. We sought to evaluate the rate and severity of injuries sustained at this event over a multiyear period. Our primary hypothesis was that motocross injury rates and severity in competition exceed that of other competitive sports in this age group., Methods: A retrospective review was performed to identify pediatric patients (17 and younger) presenting to a single Level 1 Trauma Center as a result of injury sustained at an annual motocross competition from 2009 to 2012. Demographic, diagnostic, and treatment data were collected including injuries, procedural interventions, and length of hospital stay. Rate, type, and severity of injury were evaluated and compared with established norms of other competitive sports in a similar age group., Results: Over a 4-year period, 51 pediatric motocross competitors sustained 75 injuries. Injured riders were 14.2±2.51 years (range, 8 to 17 y) old and 92% (47/51) male. Forty (78%) patients sustained at least 1 orthopaedic injury and 17 (33%) patients suffered polytrauma. The majority of injuries occurred in the upper extremity (36%). Twenty-four (47%) patients required procedural intervention, 15 of which were operative. Thirty-nine (76%) patients necessitated surgical specialty care. Average injury severity score was 6.5 (1 to 75) and 1 death occurred. The injury rate for pediatric motocross riders in this study was 19.9 injuries per 1000 competitors., Conclusions: High rates of injury occur among pediatric patients in competitive motocross, exceeding those seen in other competitive sports in a comparable age group. Significant morbidity and at least 1 fatality were demonstrated in the group studied. The majority of patients suffer at least 1 orthopaedic injury and nearly all patients require pediatric surgical specialist care. Polytrauma is common. Motocross participants and parents should be aware of these risks of competition and event organizers should arrange events near facilities with appropriate pediatric surgical specialty services., Level of Evidence: Level IV-case series.

Background: Regular physical activity can not only help with weight management, but also lower cardiovascular risks, cancer rates, and chronic disease burden. Yet, only approximately 20% of Americans currently meet the physical activity guidelines recommended by the US Department of Health and Human Services. With the rapid development of mobile technologies, mobile apps have the potential to improve participation rates in exercise programs, particularly if they are evidence-based and are of sufficient content quality., Objective: The goal of this study was to develop and test an instrument, which was designed to score the content quality of exercise program apps with respect to the exercise guidelines set forth by the American College of Sports Medicine (ACSM)., Methods: We conducted two focus groups (N=14) to elicit input for developing a preliminary 27-item scoring instruments based on the ACSM exercise prescription guidelines. Three reviewers who were no sports medicine experts independently scored 28 exercise program apps using the instrument. Inter- and intra-rater reliability was assessed among the 3 reviewers. An expert reviewer, a Fellow of the ACSM, also scored the 28 apps to create criterion scores. Criterion validity was assessed by comparing nonexpert reviewers' scores to the criterion scores., Results: Overall, inter- and intra-rater reliability was high with most coefficients being greater than .7. Inter-rater reliability coefficients ranged from .59 to .99, and intra-rater reliability coefficients ranged from .47 to 1.00. All reliability coefficients were statistically significant. Criterion validity was found to be excellent, with the weighted kappa statistics ranging from .67 to .99, indicating a substantial agreement between the scores of expert and nonexpert reviewers. Finally, all apps scored poorly against the ACSM exercise prescription guidelines. None of the apps received a score greater than 35, out of a possible maximal score of 70., Conclusions: We have developed and presented valid and reliable scoring instruments for exercise program apps. Our instrument may be useful for consumers and health care providers who are looking for apps that provide safe, progressive general exercise programs for health and fitness., (©Yi Guo, Jiang Bian, Trevor Leavitt, Heather K Vincent, Lindsey Vander Zalm, Tyler L Teurlings, Megan D Smith, François Modave. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 07.03.2017.)