The goal of this clinical trial is to compare the applicability and effectiveness of an aquatic rehabilitation training program with a conventional land-based rehabilitation program in terms of lower extremity biomechanics and knee function in Anterior Cruciate Ligament Reconstruction (ACLR) patients. The main questions it aims to answer are: * Does aquatic rehabilitation accelerate the recovery of gait symmetry and muscle function in patients after ACLR？ * Previous studies have not uncovered the training characteristics of aquatic rehabilitation, which allow for training movements that cannot be performed on land, and it is unknown whether these different training movement characteristics are more effective for patients with ACLR. Participants were randomly divided into an aquatic rehabilitation group (AR) and a land-based rehabilitation group (LR), and each group performed 70-90 minutes of training per session for a total of 6 sessions. This included warm-up activities, mobility training, strength training, functional exercises, and finishing activities. Each training session was conducted 1-2 days apart, 2-3 sessions per week, and the training was completed within 2-3 weeks.
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Stride Length Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
Step Length Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
Stride Length Time Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
Step Length Time Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
Single Support Phase Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
Oscillation Frequency Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
Mechanical Stress Relaxation Time Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
Creep Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
Range of Motion Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
2000 IKDC Subjective Knee Evaluation Form Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention). Follow-up was performed again one year after the end of the intervention using the IKDC score.
Stiffness Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).
Decrement Value Change
Timeframe: Each subject was tested before the first intervention training and after the sixth intervention training (on average 2-3 weeks after the first intervention).