There are various topics in medicine that can briefly be remembered with a single number and such topics are included in this page titled RULE OF NUMBERS.
Rule of Two
Reading X-ray in Orthopedics
While reading X-ray in orthopedics, rule of two applies. That is when-ever you read a X ray you need to have 2 views, one joint above the suspected injury site and 1 joint below, comparing both the limbs, repeated/taken 2 weeks apart and commented by 2 orthopedicians.
2 View: AP and lateral view recommended in mostly to see the deformity/ displacement , angulation
2 abnormalities: If one abnormality found always look for the next one as finding one might mask the concurrent another injury.
2 Joints: One joint above and 1 joint below to rule out involvement of joints (r/o assosciated subluxation and dislocations)
2 limbs: If doubtful always compare with contralateral limb.
2 occasions: Always compare with previous Xray if available.
2 evaluations: If no previous films, reevaluate the patient and repeat Xray on followup.
2 reviews: If doubtful should always be reviewed by another observer.
