This interventional study aims to test gait biomechanics in healthy individuals with and without experimental knee pain. The main questions it aims to answer are: * How do gait patterns change during painful walking? * Can pain sensitivity testing and gait biomechanics predict experimental knee pain intensity? Participants will receive two knee injections: a) Hypertonic saline (painful condition) and b) Isotonic saline (control condition).
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Infrared marker XYZ coordinates
Timeframe: Baseline
Pain sensitivity.
Timeframe: Baseline