The Effect of Contralateral Knee Neuromuscular Exercises on Static and Dynamic Balance, Knee Function, and Pain in Athletes Who Underwent Anterior Cruciate Ligament Reconstruction: A Single-Blind Randomized Controlled Trial

Context : Contralateral training in the early stages after surgery can improve the balance of the reconstructed knee, which is impaired following anterior cruciate ligament reconstruction (ACLR). However, little is known about the neuromuscular cross exercise after ACLR. Objective : To investigate the effects of an 8-week cross exercise on balance and function of the reconstructed knee following ACLR. Design : A single-blind randomized clinical trial. Participants : Thirty athletic males who underwent ACLR were randomly divided into intervention (n = 15) and control groups (n = 15). Intervention : The intervention and control groups received a routine physiotherapy program. In addition, the intervention group performed neuromuscular exercises on the nonoperated limb. Outcome Measures : Before and 9 weeks after ACLR, dynamic and static balance, function, and pain in the reconstructed knee were measured by Star Excursion Balance Test (SEBT), stork balance stand test, balance error scoring system (BESS), Lysholm questionnaire, and visual analog scale. Data were analyzed by SPSS using 2-independent sample t test, paired t test, and analysis of covariance. Results : Between-group comparison showed that, contralateral knee neuromuscular exercises significantly increased in the reaching distance in SEBT in the anterior ( P < .001), posterior ( P < .001), posteromedial ( P = .010), and posterolateral directions ( P = .007), decreased the number of errors in 4 stance positions of BESS including single stance on the firm ( P ≤ .001) and foam surface ( P ≤ .001), and tandem stance on the firm ( P = .028) and foam surface ( P ≤ .001). It also increased the time of standing of the stork stand test ( P = .044) and decreased the pain intensity ( P = .014). Conclusion : Neuromuscular exercise of the nonsurgical knee could improve the dynamic and static balance, and pain in the early stages following ACLR in the surgical leg. These findings may be potentially valuable for current rehabilitation protocols.