Evaluation of Injury Risk Factors and Effects of Individualized Exercise Program in Basketball and Volleyball Athletes

BACKGROUND: Musculoskeletal injuries in athletes represent a significant sports medicine and public health problem due to restricted training/competition participation, prolonged rehabilitation, and increased re-injury risk. Epidemiological data indicate that basketball and volleyball athletes carry elevated risk for lower extremity sprains/strains, knee ligament injuries, and overhead-related shoulder pathologies. University athletes are particularly vulnerable given the concurrent demands of intense academic schedules and high training loads. Clinical/functional tests can systematically identify modifiable risk factors including neuromuscular control, balance, flexibility, and functional strength. The Y-Balance Test (YBT-LQ), Hop-for-Distance Test (Limb Symmetry Index), Active Straight Leg Raise (ASLR), Closed Kinetic Chain Upper Extremity Stability Test (CKCUEST), and Glenohumeral Internal Rotation Deficit (GIRD) assessment are employed in this study, each with established reliability and predictive validity. STUDY DESIGN: This is a non-randomized, parallel-group interventional study. Athletes scoring below literature-defined cut-off values on any test receive test-specific individualized exercise prescriptions (Intervention Group), while athletes meeting all cut-off thresholds receive no intervention and serve as the observation group. Both groups undergo identical assessment at T0 and T1, and are monitored for injuries through T2. INTERVENTION: The 8-week individualized exercise program is prescribed based on each athlete's specific deficits: * YBT-LQ below cut-off (composite score less than 94% or asymmetry greater than 4 cm): Dynamic balance and proprioception exercises * Hop Test LSI below 90%: Plyometric control and symmetry exercises * ASLR below 70 degrees: Hamstring/posterior chain flexibility exercises * CKCUEST below cut-off (males less than 21, females less than 23 touches): Scapular stability and upper extremity endurance exercises * GIRD above cut-off (internal rotation deficit greater than 20 degrees or total rotation difference greater than 5 degrees): Posterior shoulder capsule and rotator cuff exercises Frequency: 3 days/week, 20-30 minutes per session. First 2 weeks supervised, subsequent weeks partially independent. Weekly compliance logged. INJURY SURVEILLANCE (T2): All participants are monitored for 6 months using IOC 2020 Consensus Statement methodology. Events are classified by type (injury/illness), onset (acute/overuse), anatomical region, severity (time-loss days), and recurrence status. Participant reports are cross-checked with team staff records where available. STATISTICAL ANALYSIS: Descriptive statistics (mean +/- SD, median, frequencies). T0-T1 comparisons: paired t-test or Wilcoxon signed-rank test (only athletes below cut-off for each respective test). Between-branch comparisons: independent t-test / Mann-Whitney U, chi-square / Fisher exact test. Effect sizes (Cohen's d). Injury incidence comparison between intervention and observation groups at T2. Significance level: p less than 0.05.