Hearing/feeling a "pop" during injury with ensuing knee instability is pathognomonic
Lever Sign or Lelli’s test (highest sensitivity at 94-100%). Demonstrated to be effective and 100% sensitive in a small ED study, especially compared to traditional methods.
Place a fist under the proximal third of the calf, opposite from tibial tuberosity
Apply moderate force to the anterior quadriceps
Heel should raise off table if there is not a complete rupture of ACL
Place a fist under the proximal third of the calf, opposite from tibial tuberosity
Apply moderate force to the anterior quadriceps
Heel should raise off table if there is not a complete rupture of ACL
Anterior Drawer Sign
Pt supine, knee flexed 90', attempt to displace tibia from femur in a forward direction
Displacement of >6mm compared w/ opposite knee indicates injury
Lachman Test
Pt supine, knee flexed 30', femur held w/ one hand, prox tibia pulled up w/ other hand
Displacement >5mm or soft end-point indicates injury
Pivot Shift Test<unk> 
Pathognomonic for ACL tear but rare
Pt supine, knee flexed 90', attempt to displace tibia from femur in a forward direction
Displacement of >6mm compared w/ opposite knee indicates injury
Pt supine, knee flexed 30', femur held w/ one hand, prox tibia pulled up w/ other hand
Displacement >5mm or soft end-point indicates injury
Pathognomonic for ACL tear but rare
Segond fracture
Knee dislocation
Jefferson fracture
Knee fractures
Capitate fracture
Patella fracture
Chance fracture
Greenstick fracture