Knee injury, any hurt in your knee, Tendinitis, when a tendon (rope that connects muscle to bone)get sore., Concussion, when your brain gets a bump and you feel dizzy or confused., Shin splint, along the front of your lower leg from running a lot., Sprain, when your ligament (like a rope inside your body) get stretched or twisted.d, Dislocation, when a bone pops out of its normal place., Fracture, a broken bone.

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