Return-to-Sport Hop Test: Limb Symmetry Simulator

Sports rehabilitation doesn't end when pain goes away — clearing an athlete to return to sport depends on quantitative proof that the injured limb performs as well as the healthy one. This simulator models the single-leg hop-for-distance test used throughout orthopedic and sports-medicine rehab: tune the injured leg's quadriceps strength deficit, how softly it lands, and how long the push-off lasts, then run a hop trial on each leg and watch the impulse-momentum and projectile mechanics play out in 3D. Live readouts track hop distance, takeoff velocity, peak landing ground-reaction force and knee-valgus risk for every trial, while the Limb Symmetry Index compares the two legs against the 90% threshold clinicians actually use to decide whether an athlete is ready to return to play.