## 4 Discussion
This adaptive response involves the compensatory mechanisms of adjacent or more distant joints, which take over some of the functions of the impaired joint to maintain the overall movement efficiency [50; 51]. For instance, an increased knee flexion and valgus angle may serve to amplify the cushioning effect upon landing, thereby enhancing the postural stability in response to the diminished ankle joint stability [52]. [PERSON] et al. [53] reported that an increased knee flexion angle during the early phase of ground contact braking facilitates full energy absorption during the landing support phase, reinforcing the cushioning effect and postural stability. Conversely, [PERSON] et al. [54] proposed that a substantial proportion of anterior cruciate ligament injuries during activities like jumping and landing are associated with heightened knee valgus loads. This implies that the compensatory strategy of individuals with FAI, while beneficial for short-term stability, might augment the load on the knee joint and other lower-limb joints over time. If the knee joint loses its compensatory capacity or sustains damage, it could affect the ankle joint's stability during drop landing tasks in individuals with FAI. However, this possibility requires further empirical validation. Potential Impact of Cognitive Load on the Risk of Sports Injuries in Individuals with FAI and Implications for Rehabilitation Training  
The specific effects of cognitive tasks on the plantarflexion angle of the ankle joint in individuals with FAI, along with the primary effects observed in other biomechanical indicators, indicate a potential risk of sports injuries under the combined demands of movement and cognition [10]. According to [PERSON] et al. [55], an increase in the knee flexion angle and ankle dorsiflexion angle can lower the body's center of gravity, aiding in landing stability. This study noted a larger knee flexion angle in individuals with FAI and also found that the plantarflexion angle of the ankle joint increased during drop landing with a cognitive task. This suggests that cognitive tasks may amplify the load on the ankle joint and adjacent muscles in individuals with FAI, potentially heightening the risk of injury. Moreover, the elevated peak vGRF and LR values in the FAI group might signify greater impact forces and a quicker rate of force transmission during drop landing, respectively. However, the elevated peak vGRF and LR, coupled with the reduced T-vGRF, observed in individuals with FAI may signify greater impact forces and an accelerated rate of force transmission during landing. This abrupt increase in force could exert additional stress on the lower-extremity joints, particularly for those with compromised ankle joints within the FAI demographic. The findings of this study are consistent with the research by [PERSON] and [PERSON] [56], who, through a drop landing experiment involving 14 individuals with FAI, demonstrated that the observed variations in force application during jump landings could be potentially harmful. These variations, characterized by specific temporal features, were inferred to originate from deficiencies in motor control. Nonetheless, these outcomes are in contrast to the perspectives put forth by [PERSON] and [PERSON] [57], who suggested that the heightened vGRF, while implicated as a trigger for recurrent injuries, might actually represent a neuromuscular adaptation intended to bolster ankle joint stability and prevent excessive inversion. Therefore, when devising rehabilitation plans for individuals with FAI, it is essential to tailor these programs based on the unique biomechanical adjustments and potential motor control deficits exhibited by these individuals during landing.