## 2 Materials and Methods
### Measures  
Three validated questionnaires and three functional tests were employed in the present study.  
1. The Causes of Re-Injury Worry Questionnaire [25] (CR-IWQ; [PERSON]'s \(\alpha\) = 0.93). This questionnaire consists of 12 questions across two factors:  
* Re-injury worry due to rehabilitation ([PERSON]'s \(\alpha\) = 0.95, score range 8-56): A higher score reflects greater concern about re-injury as a result of an ineffective rehabilitation program.  
Re-injury worry due to opponent's ability ([PERSON]'s \(\alpha\) = 0.93, score range 4-28): A higher score indicates heightened worry about re-injury due to the opponent's skill level.
2. The Sport Confidence Questionnaire of Rehabilitated Athletes Returning to Competition [26] (SCQ-RARC; [PERSON]'s \(\alpha\) = 0.92). This questionnaire comprises 14 questions divided into two factors: * Confidence due to rehabilitation ([PERSON]'s \(\alpha\) = 0.93, score range 8-56): A higher score suggests that the athlete feels more confident because of an effective rehabilitation program. * General confidence ([PERSON]'s \(\alpha\) = 0.97, score range 6-42): A higher score indicates the athlete's overall confidence in their own abilities.
3. The Attention Questionnaire of Rehabilitated Athletes Returning to Competition [27] (AQ-RARC; [PERSON]'s \(\alpha\) = 0.95). This questionnaire includes 10 questions, organized into two factors: * Functional Attention ([PERSON]'s \(\alpha\) = 0.97, score range 7-49): A higher score denotes greater focus and attention from the athlete. * Distraction Attention ([PERSON]'s \(\alpha\) = 0.94, score range 3-21): A higher score points to a greater level of distraction experienced by the athlete.  
Three functional tests were used to evaluate hop performance on the injured side: (a) the side hop test, (b) the hop-for-distance test, and (c) the vertical jump test [28]. The Intraclass Correlation Coefficient (ICC) values for all three tests ranged from 0.85 to 0.97, indicating high test-retest reliability. These tests have been predominantly used with patients who have undergone ACL injury and reconstruction [28]. [PERSON] et al. [29] investigated the validity, reliability, and quality of the side hop test (SHT) in soccer players following ACL reconstruction. They found that the side hop test demonstrated excellent validity and reliability (ICC 0.92-1.0). However, the quality of the test varied by sex and age, with male players generally showing fewer flaws, particularly in double hops and  
Figure 1: Type of injury.  
foot turns with the hopping limb. [PERSON] et al. [30] highlighted the excellent validity and reliability of the modified forward hop test. Furthermore, [PERSON] et al. [31] suggested that the single-leg vertical jump can be used in conjunction with the single-leg hop for distance or the modified single-leg hop for time (SHT) as outcome measures for assessing lower-extremity function. In another study, subjects performed the single-leg hop test, vertical jump, and side hop test on both legs across three different test sessions. This test-retest design study demonstrated excellent reliability [28].  
For measuring vertical jump performance, the MyJump2 application (version number 6.1.7) was utilized as a valid tool to assess jump height, force, velocity, and power [28]. [PERSON] et al. [32] conducted a single-session experimental design in which vertical jumps were assessed using four field test devices, including MyJump2, alongside motion capture and force platforms as criterion reference measures. They concluded that MyJump2 effectively replaces motion capture and force platforms for evaluating vertical jump tests, particularly for measuring jump height. The MyJump2 app demonstrated excellent validity, with an Intraclass Correlation Coefficient (ICC) of 0.99 across all jump modalities.