thought this was interesting. guess they don't keep track of minor knee bashes

The NICA Safety Study’s (for 5 most common mountain bike crash injuries) parameters include only injuries which required medical attention, forced riders into a period of recovery, and/or resulted in time away from work or school

Head trauma and brain injury
Fractured hand and/or wrist
Fractured forearm
Trauma to the face
Fractured shoulder or clavicle