Effect of Aquatic Proprioception Training, Strengthening, and Balance Exercises on Knee Joint Stability and Functional Performance in Anterior Cruciate Ligament Injury

Background Anterior cruciate ligament (ACL) injuries frequently induce symptomatic knee instability and functional decline among active individuals. This pathology extends beyond mechanical insufficiency, involving significant deficits in muscle force production, balance, and proprioception. Collectively, these neuromuscular disruptions impair joint stability and represent critical factors that can delay the recovery of full functional status. While conventional land-based rehabilitation remains the standard approach, aquatic rehabilitation has gained attention due to its ability to reduce joint loading while enhancing neuromuscular control through the unique physical properties of water. However, evidence evaluating the combined effect of aquatic proprioceptive training, strengthening, and balance exercises on functional outcomes following ACL injury remains limited. Objectives The primary objective of this study is to evaluate the impact of a structured six-week aquatic-based rehabilitation protocol, which integrates proprioceptive, strengthening, and balance exercises, on knee joint stability and functional performance in patients diagnosed with grade 1 and 2 ACL injuries. Furthermore, the research involves a comparative analysis to determine the efficacy of this water-based intervention relative to a traditional land-based rehabilitation strategy. Methods This experimental study analysed 120 patients, aged 18 to 35, with grade 1 and 2 ACL tears who received non-operative treatment rather than surgery. Participants were randomly allocated into two groups: Group A (aquatic rehabilitation) and Group B (land-based rehabilitation), with 60 participants in each group. Participants in both study arms engaged in a systematic rehabilitation protocol, attending three sessions weekly over a total duration of six weeks. The study evaluated four primary parameters: proprioception (joint position sense), strength (one-repetition maximum (1RM) leg press), dynamic balance (Y Balance Test), and self-reported function assessed using the International Knee Documentation Committee (IKDC) score. Changes from baseline to post-intervention were scrutinised using paired t-tests, while differences between groups were assessed via independent t-tests. All statistical analyses utilised a stringent significance level of p <0.0001. Results Although both rehabilitation modalities significantly improved knee function and neuromuscular control (p <0.0001), the aquatic program demonstrated clear superiority. Participants in the aquatic group achieved significantly greater improvements in proprioception, muscle strength, and dynamic balance compared to the land-based control. The resulting higher IKDC scores underscore the aquatic environment's enhanced efficacy in restoring knee stability and overall functional capacity in patients with ACL injuries. Conclusion Aquatic-based rehabilitation, incorporating proprioceptive and resistance training, demonstrates significantly greater improvement than conventional land-based therapy in optimising knee stability and functional outcomes for patients with ACL injuries. The findings support the integration of structured aquatic rehabilitation programs into ACL management protocols to optimise neuromuscular recovery and functional outcomes.