The scissor jump (SKJ) is vital in badminton, particularly for backcourt shots, but fatigue increases lower limb load and injury risk. This study investigates how quadriceps fatigue affects biomechanical characteristics and load during SKJ landing, aiming to understand its impact on injury risk. This study involved 27 amateur male badminton players from Ningbo University. Quadriceps fatigue was induced via knee exercises and footwork drills. Biomechanical data before (prior fatigue—PRF) and after fatigue (post fatigue—POF) were recorded using a force platform and motion capture system. Muscle activation was measured with EMG and analyzed through musculoskeletal modeling, with paired t-tests and SPM 1D (Statistical Parametric Mapping 1D) for statistical analysis. Under the POF condition, knee flexion angle increased, and power decreased (p < 0.001, p < 0.001, respectively); ankle plantarflexion angle increased, and power decreased (p < 0.001, p < 0.001, respectively). As fatigue progressed, joint reaction forces initially decreased but later increased. Joint energy dissipation decreased, with differences more pronounced in the coronal than sagittal plane. Achilles tendon force and anterior–posterior tibial shear force decreased, while coronal plane center-of-mass displacement increased. Findings show quadriceps fatigue harms limb stability, upping knee and ankle loads, disrupting the movement pattern, and risking coronal plane injuries. It is recommended that athletes enhance quadriceps endurance, improve neuromuscular control, and refine landing techniques to maintain stability and prevent injuries when fatigued.

Motorsport remains high risk despite advances in crash protection, vehicle design, and medical response. Effective injury prevention requires understanding interactions among crash loading, human injury tolerance, protective-system design, and material behavior. This scoping review searched PubMed, Web of Science, IEEE Xplore, and Scopus for English-language studies from 2000 to July 2026 addressing motorsport safety, injury biomechanics, finite element analysis or modeling, protective-system design, or impact-mitigation materials. Study characteristics were charted, and evidence was narratively synthesized following scoping-review principles. Fifty-six studies were included. Injury prevention increasingly draws on head-kinematic field measurements, injury epidemiology, region-specific finite element analyses, and studies of helmets, restraints, seats, and energy-absorbing structures. The most direct evidence concerns integrated head-neck protection, restraint and seat geometry, and the use of finite-element methods to interpret local injury mechanisms. Emerging material strategies are promising but rely mainly on component-level or simulation-based evidence rather than driver-level injury outcomes. Overall, biomechanics, protective-system design, and material selection are increasingly integrated, but evidence remains uneven. Real-world injury surveillance is limited, simulation studies predominate over field outcomes, and direct evidence linking emerging materials to driver-level injury reduction remains sparse. Progress requires better surveillance datasets, stronger motorsport-specific validation, and more driver-centered protective design.