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Objectives

To summarise and systematically appraise the credibility, readability, and accuracy of the online information about knee crepitus.

Design

Systematic appraisal of online information.

Method

The top 20 URLs of two search engines (Google and Bing) for the following terms were screened for eligibility ‘knee crepitus’, ‘knee sound’, and ‘knee crackling’ (N ​= ​120 websites). Two reviewers assessed the websites for credibility (JAMA benchmark) and readability (Flesch Reading Ease and Flesch-Kincaid Grade Level tests). For accuracy, we performed a qualitative analysis creating thematic units based on the website's content and explored whether they were supported by evidence.

Results

Fifty-one websites were included. There was a large variation in the overall credibility of websites, with more than half of the websites lacking credible information. The median Flesch reading ease was 62 (range ​= ​42–88) and Flesch–Kincaid grade level was 8 (range ​= ​3–12). Six key thematic units emerged from our qualitative analysis all with sub-themes within them. The main topics covered by websites were: (i) What is knee crepitus? (ii) Is knee crepitus a problem? (iii) What is the cause of knee crepitus? (iv) How to manage knee crepitus? (v) What are the health consequences of having knee crepitus? (vi) Who should I seek if I have knee crepitus?

Conclusion

Patients and clinicians should take caution when seeking web-based information about knee crepitus. Websites about knee crepitus lack credibility, present a large variation in readability outcomes, and there was no research evidence available to support most of their information.

Objective

To investigate the relationship between head impact characteristics and the levels of blood biomarkers associated with brain injury, neurofilament light (NfL) and glial fibrillary acidic protein (GFAP).

Methods

Four elite amateur Muay Thai athletes were equipped with impact monitoring mouthguards, collecting linear and rotational acceleration data during a period of eight weeks. Capillary blood samples were collected after each period of sparring sessions to analyse the levels of NfL and GFAP.

Results

On a group level, mean GFAP levels were negatively correlated to mean impacts per session (p ​< ​0.05). Two athletes had significant correlations between head impact characteristics and the levels of NfL and/or GFAP.

Conclusions

The results indicate that NfL and GFAP might responded differently to linear and rotational accelerations and/or that the effect of different types of accelerations on brain tissue integrity is individual. The methods used could be useful to monitor brain health in different impacts sports.

The 9th FIFA Women's World Cup (FWWC) marked several milestones: the first hosted by two Nations, held in the Southern Hemisphere, comprising 32 teams, and >1.9million spectators (FWWC attendance record). The overwhelming success of the tournament stimulated huge public interest in women's football. The importance of maximising player health was apparent throughout the tournament with injuries and illnesses affecting team selection and performance, emphasising the need for continued focus on women's football player health. This short report summarises the key takeaway messages from the Women's Football Medicine Conference held online during the round stages of the 2023 FWWC.

Objective

Two techniques facilitate the transition in an alpine ski turn, extension (EXT) and flexion (FLEX). The purpose of this study is to compare NIRS, EMG, and RPE responses between EXT and FLEX in expert level skiers.

Design

24 Professional Ski Instructors of America Level III alpine ski instructors, examiners, and National Demonstration Team members completed one standardized run each of EXT and FLEX. A turn cycle, made of a right and left turn, was divided into four Phases.

Methods

NIRS assessed HbO2 desaturation in the rectus femoris (RF) and vastus lateralis (VL). EMG was collected from the RF, VL, and gluteus medius (GM). Rating of Perceived Exertion (RPE, 0–10) assessed subjective exertion.

Results

FLEX resulted in greater HbO2 desaturation in RF (−77.9 ​± ​21% vs. −67.5 ​± ​23%, p ​< ​0.001), VL (−69.8 ​± ​23.1% vs. −61.1 ​± ​24.6%, p ​< ​0.001) and RPE (6.0 ​± ​2.3 vs. 5.2 ​± ​2.0, p ​< ​0.001) compared to EXT. FLEX generally resulted in greater EMG activity in the steering and transition phases for RF and VL (p ​< ​0.001) while EXT resulted in greater activity GM on the inside leg.

Conclusions

Caution should be exercised with recreational skiers as the FLEX transition resulted in significantly greater physiological stress compared to EXT. Localized hypoxia appears to be the focal point of this stress as HbO₂ desaturation was ∼15% greater along with 15% greater RPE during FLEX. FLEX also produced greater EMG activity than EXT in the majority of the turn phases.

Objectives

Design parameters and landing impacts for selected snow park jumps in Switzerland were compared with the parameters recommended to increase the jumps’ safety by the Swiss Council for Accident Prevention (BFU). High impact zones were identified to help snow park shapers optimize the design of their jumps. A rough estimate of the influence of snow hardness on landing impacts was also provided.

Design

During the 2020/2021 winter season three-dimensional geometries of 23 jumps were captured using differential global navigation satellite system and terrestrial laser scanning. A point mass model was used to numerically calculate trajectories. The equivalent fall height (eFH) was used to quantify landing impacts and an empiric snow-deformation function was applied to take the effect of snow hardness into consideration. Workshops were held to discuss results and transfer findings.

Methods

2D-profiles of the jumps were estimated by projecting the captured 3D position data onto the longitudinal cross-section plane. Table and landing geometry were smoothed and interpolated to a spatial resolution of 0.1 ​m, while the kicker was fitted with a 2nd order polynomial. Trajectories were numerically calculated for take-off speeds from 6 to 17.6 ​m ​s⁻¹ including aerodynamic forces using the Runge-Kutta method. The calculated eFH at the landing points were used to divide the landing into low-impact, medium-impact, and high-impact zones.

Results

Medium sized jumps had a low-impact zone of sufficient length (>6 ​m) and eFH smaller than 1.5 ​m throughout the entire table meeting the BFU recommendations. Nevertheless, critical eFH larger than 1.5 ​m, were obtained when take-off speeds increased by only 1.14 ​m ​s⁻¹. Large jumps had low-impact zone lengths in accord with the recommendations (>9 ​m), but high eFH (2.3–3.4 ​m) occurred for table landings. 10 of the 13 XL-jumps had long low-impact zones of approximately 12–15 ​m. Besides the risk of high impact landings towards the end of the landing area, as found similarly for the smaller jumps, portions of XL-jumps had very high eFH (2.6–4.6 ​m) for table landings.

Conclusions

The study confirmed the existing BFU recommendations of size categories, design parameters and landing impacts limits as prevalent and practicable and provided knowledge for future safety recommendations. Modifying table geometries and taking measures to limit the in-run speeds would help reduce landing impacts, and the hazard due to hard snow conditions should also be considered.

Objectives

The purpose of this scoping review was to explore what is known about eating disorders and disordered eating in elite youth athletes aged 12–18. This review intended to explore what is known about the prevalence, risk factors, and outcomes of these conditions.

Design

Scoping Review.

Method

A scoping review was conducted following the Johanna Briggs Institute (JBI) and Preferred Reporting Items for Systematic reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) methodology. Six key databases were searched to identify articles for inclusion: PsycInfo, MEDLINE, CINAHL, SPORTDiscus, Scopus, and Google Scholar. Data was subsequently extracted and summarised in line with the research questions.

Results

In total, 21 studies were found that met inclusion criteria. The included studies overwhelmingly focused on girls, European populations, and used a cross-sectional quantitative study design. Where clinical interview was used, there were higher rates of eating disorders among elite youth athletes compared to the general youth population. The most cited risk factors included female gender, leanness sports, and those with higher body mass index. Eating disorders and disordered eating were found to be associated with higher rates of depression and anxiety but there was limited investigation of other associated outcomes.

Conclusions

Findings from this review suggest that elite youth athletes are at risk of eating disorders and disordered eating. However, significant limitations in the field exist and further research is needed using clinical interview and population specific screening tools to better understand the prevalence, risk factors and outcomes of disordered eating and eating disorders to support this population.