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Key advantages of wheelless walkers: • Extremely high stability • Strong safety • Controllable pace of use • Strong support • Simple structure, low learning curve • Ideal for short-distance indoor use Key disadvantages of wheelless walkers: • Requires lifting to move, consuming energy • Very slow movement speed • Not suitable for long-distance walking • Not suitable for complex outdoor terrains • Prone to compensatory gait • Difficult to operate when turning or on irregular surfaces

The following situations are unsuitable for using a 4-wheeled walking vehicle: • Completely dependent on external support when standing • Unable to maintain upright balance even with legs spread • Immediately leans forward when letting go • Significant balance impairment, indicating severe gait instability