BACKGROUND: Dynamic knee valgus (DKV) accompanied by poor balance is the cause of anterior cruciate ligament (ACL) injury in athletes, and the identification and correction of these factors are always of interest to researchers. Therefore, the purpose of this research was to investigate the effect of the STOP-X program on the knee valgus angle and static and dynamic balance in female basketball players with DKV defects. METHODS: The present study was a quasi-experimental study. Thirty female basketball players with DKV defects were purposefully identified by the single-leg landing (SLL) test and were randomly assigned to two control (n = 15) and experimental (n = 15) groups. Static balance status was evaluated with the BASS STICK test, and dynamic balance status was evaluated with the Y-balance test (YBT). The experimental group performed the STOP-X program for 25 to 40 min for eight weeks (three times per week), and the control group performed their traditional warm-up program. Data were analyzed by means of 2 x 2 repeated measures ANOVA followed by post hoc comparison (Bonferroni) at the significance level of (p < 0.05) with SPSS version 26. RESULTS: The results showed that with the use of the STOP-X program, there was a significant difference between the experimental and control groups in variables of the static balance (F = 56.45; p = 0.001; ES 0.66, PC 59.64%), total dynamic balance score (F = 107.57; p = 0.001; ES 0.79, PC 19.84%), and knee valgus angle (F = 119.46; p = 0.001; ES 0.81, PC 34.36%). CONCLUSIONS: In addition to reducing the knee valgus angle, applying the STOP-X injury prevention program can improve static and dynamic balance in female basketball players with DKV defects. Therefore, it can be recommended that sports trainers benefit from these advantages by adding STOP-X training to routine basketball exercises.

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