<prompt> Puppes rule isTwo fracture lines cross at right anglesTwo fracture lines cross at acute angleTwo fracture lines never cross each otherTwo fracture lines cross at obtuse angle  <response>: Two fracture lines will never cross puppes rule . Applying this rule it is easy to find out the sequence of injuries, i,e which fracture has occured first. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 162 