WHY THIS HAPPENS
Saddle too low — excessive knee flexion at bottom of pedal stroke
Saddle too high — hyperextension causing posterior knee pain
Cleat rotation wrong — fixed cleats forcing unnatural knee tracking
Too much, too soon — rapid load increases outpacing tissue adaptation
Single-leg imbalance — one leg overloading
Low cadence grinding — high-force pedalling loading the patella tendon
Weak glutes/VMO — knee tracking controlled by hip and quad muscles