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The aim of the protocol is to investigate the feasibility and effectiveness of combining conventional rehabilitation with visual-feedback balance platform training in elderly patients undergoing primary unilateral Total Knee Arthroplasty (TKA). The method shows a single-blind, randomized controlled trial that enrolled 60 patients undergoing primary unilateral TKA (23 males, 37 females). Participants were randomly assigned to a control group (n=30; mean age 69.60 ± 2.98 years) or an observation group (n=30; mean age 70.87 ± 4.26 years). The control group received conventional rehabilitation, while the observation group received conventional rehabilitation plus visual-feedback balance platform training. The visual feedback intervention commenced in the second postoperative week, conducted 5 times per week for 20-30 min per session, over a 5-week period. Balance function was evaluated using platform-specific metrics: Length of Movement Trajectory (LMT) and Area of Movement Ellipse (AME). Functional mobility was assessed via the Timed Up and Go Test (TUGT), Single-Leg Stance (SLS), Timed Sit-to-Stand (STS), and Timed Stair Test (TST). Data were analyzed using independent and paired t-tests with a significance level of p < 0.05. After the 6-week program, both groups showed significant improvements across all parameters compared to baseline (p < 0.05). However, the observation group exhibited significantly superior outcomes compared to the control group. Specifically, static stability metrics (LMT, AME) and TUGT performance were significantly better in the observation group (p < 0.01). Similarly, the observation group demonstrated significant improvement in SLS, STS, and TST (p < 0.05) compared to controls. Integrating visual-feedback balance platform training with conventional rehabilitation significantly enhanced static and dynamic balance function in elderly TKA patients, offering superior efficacy to conventional rehabilitation alone.