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Objectives: To describe the epidemiological patterns and clinical characteristics of sports injuries treated at two hospitals in Douala. Methods: This was a cross-sectional study conducted at the Douala General Hospital and Douala Laquintinie Hospital, involving medical records of patients treated for sports injuries from January 2012 to April 2022. Data extracted from records were entered into a data collection software and analysed using Microsoft Excel 2016. Severe injuries were defined as an injury score greater than or equal to 3 on the Abbreviated Injury Scale. Results: The prevalence of sports injuries was 1.12% among all trauma cases. There was a male predominance with 62 (86.1%) males and 10 (13.9%) females. The mean age was 24.97±13.8 years. Most injured persons were students 35 (48.6%), followed by the employed 26 (36.1%), athletes 6 (8.3%) and the unemployed 5 (6.9%). Recreational sports accounted for 43 (59.7%) injuries while 16 (22.2%) injuries occurred during physical education, 8 (11.1%) during trainings and 5 (6.9%) during competitions. Football injuries were 48 (66.7%), running injuries 10 (13.9%) and 9 (12.5%) occurred during long, high and triple jump. Among all injuries, fractures were 43 (59.7%), 11 (15.3%) joint sprains, 5 (6.9%) muscle injuries, 4 (5.6%) brain injuries while 9 (12.5%) were contusions and lacerations. Lower extremity injuries were 34 (47.2%), 21 (29.2%) injuries were on the upper extremities, 4 (5.6%) abdominopelvic, 3 (4.2%) thoracic injuries, 9 (12.5%) head injuries and 1 (1.4%) on the neck. Overall, 53 (73.7%) were severe injuries. Conclusion: The majority of sports injuries treated in these hospitals are fractures that occur during recreational sports, particularly football and predominantly involve the lower extremity. A significant proportion are severe injuries.

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Background/aim: The participation of individuals with physical impairment in sports has numerous benefits, yet there is also the risk of sustaining sport-related injuries or illnesses. Therefore, prevention programmes of these problems are needed to ensure that individuals can maintain a healthy, active lifestyle. Currently, very few prevention interventions are accessible for these athletes. Therefore, the article aims to describe the development process of the Tailored Injury Prevention in Adapted Sports intervention, an online tailored injury and illness prevention intervention for athletes with a physical impairment. Methods: The development was guided by the Knowledge Transfer Scheme (KTS). Results: In the first step, a cohort study and a qualitative study were conducted to define the problem statement. In the second step, a systematic review was performed in order to learn from theory. Steps 3 and 4 involved an iterative process involving collaboration with diverse expert groups. This included defining athletes' needs and creating a health problem blueprint, after which the intervention content was created. To ensure accuracy and completeness, a feedback loop was incorporated. In the final phase of this step, we refined the language used within the intervention together with athletes. Finally, an effect and process evaluation will take place in the last step of the KTS. Conclusions: Through a five-step approach of the KTS, we developed an online injury and illness prevention intervention for athletes with a physical impairment. This intervention provides direct, timely feedback based on their current health status. Furthermore, it takes the sport and the physical impairment of the athletes into account with regard to the given prevention advices.

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Sports medicine physicians and physiotherapists commonly use cryotherapy (eg, ice application) postinjury to decrease tissue temperature with the objective of reducing pain, limiting secondary injury and inflammation, and supporting healing. However, besides the analgesic effect of cryotherapy, a literature search revealed no evidence from human studies that cryotherapy limits secondary injury or has positive effects on tissue regeneration. Thus, our current understanding of the potential mechanisms and applications of cryotherapy largely relies on the results from animal studies. Importantly, treatment should not aim at obliterating the inflammatory and regeneration processes but instead aim to restore an adapted/normal regulation of these processes to improve function and recovery. However, some animal studies suggest that cryotherapy may delay or impair tissue regeneration. With the translation of laboratory animal studies to human sport medicine being limited by different injury and muscle characteristics, the effect of cryotherapy in patients with musculoskeletal injuries is uncertain. Thus, pending the results of human studies, cryotherapy may be recommended in the first 6 hours following an injury to reduce pain (and possibly haematoma), but it should be used with caution beyond 12 hours postinjury as animal studies suggest it may interfere with tissue healing and regeneration.

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OBJECTIVE: To describe and categorise the injury-inciting circumstances of sudden-onset hamstring match injuries in professional football players using systematic video analysis. METHODS: Using a prospective injury surveillance database, all sudden-onset hamstring match injuries in male football players (18 years and older) from the Qatar Stars League between September 2013 and August 2020 were reviewed and cross-referenced with broadcasted match footage. Videos with a clear observable painful event (ie, a player grabbing their posterior thigh) were included. Nine investigators independently analysed all videos to describe and categorise injury-inciting circumstances. We used three main categories: playing situation (eg, time of injury), player action(s) (eg, running) and other considerations (eg, contact). Player action(s) and other considerations were not mutually exclusive. RESULTS: We included 63 sudden-onset hamstring match injuries out of 295 registered injuries between 2013 and 2020. Running was involved in 86% of injuries. Hamstring injuries occurred primarily during acceleration of 0-10 m (24% of all injuries) and in general at different running distances (0-50 m) and speeds (slow to fast). At 0-10 m distance, indirect player-to-player contact and inadequate balance were involved in 53% and 67% of the cases, respectively. Pressing occurred in 46% of all injuries (injured player pressing opponent: 25%; being pressed by opponent: 21%) and frequently involved player-to-player contact (69% of the cases when the injured player was pressing vs 15% of the cases when the opponent was pressing) and inadequate balance (82% vs 50%, respectively). Other player actions that did not involve running (n=9, 14% of all injuries) were kicking (n=6) and jumping (n=3). CONCLUSION: The injury-inciting circumstances of sudden-onset hamstring match injuries in football varied. The most common single-player action (24%) was acceleration over a distance of <10 m. Pressing, inadequate balance and indirect contact were frequently seen player actions. Injury prevention research in football should look beyond high-speed running as the leading risk factor for sudden-onset hamstring injuries.

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Purpose: Despite the publication of several randomized controlled trials (RCTs), it is not clear which technique for the treatment of focal chondral and osteochondral defects of the knee grants the best clinical outcome. The aim of this network meta-analysis (NMA) was to compare the efficacy and safety of microfractures (MF), autologous chondrocyte implantation (ACI), autologous matrix-induced chondrogenesis (AMIC), osteochondral autograft transplantation (OCT) at short (< 1 year), intermediate (1-5 years) and long-term (> 5 years). Methods: We carried out an NMA with Bayesian random-effect model, according to PRISMA guidelines. The search was performed in MEDLINE, EMBASE, Web of Science, CENTRAL, CINAHL, SPORTDiscus, clinicaltrials.gov, WHO ICTRP, from inception to November 2022. The eligibilities were randomized controlled trials on patients with knee chondral and osteochondral defects, undergoing microfractures, OCT, AMIC, ACI, without restrictions for prior or concomitant surgery on ligaments, menisci or limb alignment, prior surgery for fixation or ablation of osteochondritis dissecans fragments, and prior cartilage procedures as microfractures, drilling, abrasion, or debridement. Results: Nineteen RCTs were included. No difference among treatments was shown in the pooled comparison of patient reported outcome measures (PROMs) at any timepoint. Safety data were not available for all trials due to the heterogeneity of reporting, but chondrospheres seemed to have lower failure and reoperation rates. Conclusion: This NMA showed no difference for PROMs with any technique. The lower failure and reoperation rates with chondrospheres must be interpreted with caution since adverse event data was heterogenous among trials. The standardization of the efficacy and safety outcome measures for future trials on knee cartilage repair and regeneration is necessary.

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OBJECTIVE: To describe the evidence pertaining to associations between growth, maturation and injury in elite youth athletes. DESIGN: Scoping review. DATA SOURCES: Electronic databases (SPORTDiscus, Embase, PubMed, MEDLINE and Web of Science) searched on 30 May 2023. ELIGIBILITY CRITERIA: Original studies published since 2000 using quantitative or qualitative designs investigating associations between growth, maturation and injury in elite youth athletes. RESULTS: From an initial 518 titles, 36 full-text articles were evaluated, of which 30 were eligible for final inclusion. Most studies were quantitative and employed prospective designs. Significant heterogeneity was evident across samples and in the operationalisation and measurement of growth, maturation and injury. Injury incidence and burden generally increased with maturity status, although growth-related injuries peaked during the adolescent growth spurt. More rapid growth in stature and of the lower limbs was associated with greater injury incidence and burden. While maturity timing did not show a clear or consistent association with injury, it may contribute to risk and burden due to variations in maturity status. CONCLUSION: Evidence suggests that the processes of growth and maturation contribute to injury risk and burden in elite youth athletes, although the nature of the association varies with injury type. More research investigating the main and interactive effects on growth and maturation on injury is warranted, especially in female athletes and across a greater diversity of sports.

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OBJECTIVE: To assess whether National Football League (NFL) players diagnosed with a concussion have an increased risk of injury after return to football. METHODS: A retrospective cohort study analysed the hazard of subsequent time-loss lower extremity (LEX) or any musculoskeletal injury among NFL players diagnosed with a concussion in 2015-2021 preseason or regular season games compared with: (1) all non-concussed players participating in the same game and (2) players with time-loss upper extremity injury. Cox proportional hazards models were adjusted for number of injuries and concussions in the prior year, player tenure and roster position. Additional models accounted for time lost from participation after concussion. RESULTS: There was no statistical difference in the hazards of LEX injury or any musculoskeletal injury among concussed players compared with non-concussed players, though concussed players had a slightly elevated hazard of injury (LEX injury: HR=1.12, 95% CI 0.90 to 1.41; any musculoskeletal injury: HR=1.08, 95% CI: 0.89 to 1.31). When comparing to players with upper extremity injuries, the hazard of injury for concussed players was not statistically different, though HRs suggested a lower injury risk among concussed players (LEX injury: HR=0.78, 95% CI: 0.60 to 1.02; any musculoskeletal injury: HR=0.82, 95% CI: 0.65 to 1.04). CONCLUSION: We found no statistical difference in the risk of subsequent injury among NFL players returning from concussion compared with non-concussed players in the same game or players returning from upper extremity injury. These results suggest deconditioning or other factors associated with lost participation time may explain subsequent injury risk in concussed players observed in some settings after return to play.

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OBJECTIVES: To identify evidence-practice gaps regarding shoulder injury risk factors in competitive swimmers. METHODS: We gathered insights from 27 swimming experts including elite swimmers, coaches, high-performance staff and applied researchers using Concept Mapping. Participants brainstormed, sorted and rated (from 1 (least) to 10 (most) important and modifiable) their ideas of shoulder injury risk factors in competitive swimmers. Proposed risk factors rated above the grand mean for importance (6.2±0.4) or modifiability (6.5±0.5) ratings were considered highly important/modifiable. Expert opinions were then juxtaposed with systematic review findings to identify overlaps or convergences. RESULTS: Brainstorming generated 126 proposed shoulder injury risk factors for competitive swimmers, subsequently refined to 61 unique proposed risk factors by removing duplicates and combining similar responses. The participants sorted the 61 risk factors into seven distinct clusters. Experts perceived 36/61 proposed risk factors as highly important, of which 6 were supported by literature, 6 showed no association with injury, 2 had conflicting evidence and the remaining 22 have not yet been investigated, suggesting an evidence-practice gap. Three proposed risk factors 'inconsistent training load', 'poor stroke technique' and 'low posterior shoulder strength-endurance' exhibited high perceived importance, high perceived modifiability and supporting evidence. CONCLUSION: An evidence-practice gap was identified for 28 proposed risk factors perceived as highly important by swimming experts despite either (1) no relevant empirical research (n=22), or (2) no association with injury (n=6) from synthesised evidence. Greater collaboration between researchers and practitioners is needed to effectively address shoulder injury risk factors in competitive swimmers.

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OBJECTIVES: To investigate if daily treatment with glyceryl trinitrate (GTN) ointment, over 24 weeks combined with a 12-week eccentric exercise programme is more effective for chronic mid-portion Achilles tendinopathy than placebo ointment and eccentric exercise. METHODS: This was a single-site randomised double-blind placebo-controlled trial at an acute hospital, Dublin, Ireland. Patients with chronic mid-portion Achilles tendinopathy were randomised to either 24 weeks of daily GTN ointment or placebo ointment. Both groups received an identical 12-week eccentric exercise programme. The primary outcome measure was the Victorian Institute of Sport Assessment-Achilles (VISA-A) questionnaire at 24 weeks, which measures pain, function and activity. Secondary outcomes included pain severity, self-reported physical function, calf muscle function, pressure pain thresholds and ultrasound changes. Statistical analyses were performed according to intention-to-treat principles. RESULTS: 76 patients (30 women; 46 men, mean age±SD, 45.6±8.2 years) were recruited for the trial. Significant improvements in VISA-A scores occurred in both groups at 6-week, 12-week and 24-week follow-up. The increase was not significantly different between groups, adjusted mean between-group difference from baseline to week 6, -1.33 (95% CI -6.96 to 4.31); week 12, -1.25 (95% CI -8.0 to 5.49) and week 24, -3.8 (95% CI -10.6 to 3.0); negative values favour GTN. There was no significant between-group difference in any of the secondary outcome measures at 6, 12 and 24 weeks. CONCLUSIONS: Adding daily GTN ointment over 24 weeks to a 12-week eccentric exercise programme did not improve pain, function and activity level in patients with chronic mid-portion Achilles tendinopathy when compared with placebo ointment.

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In recent years, a large focus has been placed on managing training load for injury prevention. To minimise injuries, training recommendations should be based on research that examines causal relationships between load and injury risk. While observational studies can be used to estimate causal effects, conventional methods to study the relationship between load and injury are prone to bias. The target trial framework is a valuable tool that requires researchers to emulate a hypothetical randomised trial using observational data. This framework helps to explicitly define research questions and design studies in a way that estimates causal effects. This article provides an overview of the components of the target trial framework as applied to studies on load and injury and describes various considerations that should be made in study design and analyses to minimise bias.

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Injuries are recognised in sports and exercise medicine as not isolated incidents but complex outcomes. This is because an athlete's health trajectory is understood to be shaped by dynamic, complex linkages between individual performance, biology, and the wider social and cultural contexts and systems in which individuals perform. Despite this recognition, little attention has been paid to how interpersonal and contextual dynamics can potentially affect the risk of injury by influencing the choices and decisions made by coaches, parents and athletes. To address this gap, this narrative review bridges insights from sociocultural studies in sports with the findings of sports injury research. The narrative review aims to identify and summarise how interpersonal and contextual dynamics influence the risk of youth sports injuries. The results reveal the pressures faced by athletes, often leading to compromised health. Moreover, the review underscores the importance of designing complex interventions and strategies to promote healthier practices in youth sports. Specifically, intervention programmes should prioritise raising awareness of injury risks, cultivating effective communication skills and fostering supportive training environments.

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Objectives: Implementation of injury prevention exercise programmes (IPEPs) in sports is challenging, and behaviour change among players and coaches is essential for success. The aim was to describe players' and coaches' motivation and coaches' goal pursuit when using IPEPs in amateur and youth football across a season. A secondary aim was to describe players' motivation to engage in IPEP use in relation to presence or absence of injury. Methods: The study was based on questionnaires to amateur and youth, male and female football players and coaches at baseline, mid-season and post-season in a three-armed randomised trial in 2020 in Sweden. Questionnaires were based on the Health Action Process Approach (HAPA) model with questions about the motivational phase when intention for change is created (players and coaches) and a goal-pursuit phase when intention is translated into action (coaches). Results: In total, 455 players (126 male), mean age 20.1 years (SD±5.8, range 14-46) and 59 (52 male) coaches took part. Players generally gave positive answers in the HAPA motivational phase (Likert 6-7 on a 1-7 Likert scale). Differences in ratings between injured and uninjured players were minor. Coaches had positive or neutral ratings (Likert 4-6) in the motivational and goal-pursuit phases. Ratings deteriorated across the season, with less positive responses from 40% of players and 38-46% of coaches post-season. Conclusion: Positive ratings in the HAPA motivational phase indicated fertile ground for IPEP use. Neutral ratings by coaches and deterioration across the season in players and coaches suggest a need for ongoing support for IPEP use. Trial registration number: NCT04272047.

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Objective: This paper presents an exploratory case study focusing on the applicability and value of process mining in a professional sports healthcare setting. We explore whether process mining can be retrospectively applied to readily available data at a professional sports club (Football Club Barcelona) and whether it can be used to obtain insights related to care flows. Design: Our study used discovery process mining to detect patterns and trends in athletes' Post-Pre-Participation Medical Evaluation injury route, encompassing five phases for analysis and interpretation. Results: We examined preprocessed data in event log format to determine the injury status of athletes in respective baseline groups (healthy or pathological). Our analysis found a link between thigh muscle injuries and later ankle joint problems. The process model found three loops with recurring injuries, the most common of which were thigh muscle injuries. There were no differences in injury rates or the median number of days to return to play between the healthy and pathological groups. Conclusions: This study explored the applicability and value of process mining in a professional sports healthcare setting. We established that process mining can be retrospectively applied to readily available data at a professional sports club and that this approach can be used to obtain insights related to sports healthcare flows.

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OBJECTIVES: Studies identifying clinical and MRI reinjury risk factors are limited by relatively small sample sizes. This study aimed to examine the association between baseline clinical and MRI findings with the incidence of hamstring reinjuries using a large multicentre dataset. METHODS: We merged data from four prospective studies (three randomised controlled trials and one ongoing prospective case series) from Qatar and the Netherlands. Inclusion criteria included patients with MRI-confirmed acute hamstring injuries (<7 days). We performed multivariable modified Poisson regression analysis to assess the association of baseline clinical and MRI data with hamstring reinjury incidence within 2 months and 12 months of follow-up. RESULTS: 330 and 308 patients were included in 2 months (31 (9%) reinjuries) and 12 months (52 (17%) reinjuries) analyses, respectively. In the 2-month analysis, the presence of discomfort during the active knee extension test was associated with reinjury risk (adjusted risk ratio (ARR) 3.38; 95% CI 1.19 to 9.64). In the 12 months analysis, the time to return to play (RTP) (ARR 0.99; 95% CI 0.97 to 1.00), straight leg raise angle on the injured leg (ARR 0.98; 95% CI 0.96 to 1.00), the presence of discomfort during active knee extension test (ARR 2.52; 95% CI 1.10 to 5.78), the extent of oedema anteroposterior on MRI (ARR 0.74; 95% CI 0.57 to 0.96) and myotendinous junction (MTJ) involvement on MRI (ARR 3.10; 95% CI 1.39 to 6.93) were independently associated with hamstring reinjury. CONCLUSIONS: Two clinical findings (the presence of discomfort during active knee extension test, lower straight leg raise angle on the injured leg), two MRI findings (less anteroposterior oedema, MTJ involvement) and shorter time to RTP were independently associated with increased hamstring reinjury risk. These findings may assist the clinician to identify patients at increased reinjury risk following acute hamstring injury. TRIAL REGISTRATION NUMBERS: NCT01812564; NCT02104258; NL2643; NL55671.018.16.

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