True about appendicular rupture is A/E -
Early antibiotics don't prevent rupture, that's why immediate appendicectomy is the recommended treatment of acute appendicitis.
Immediate appendicectomy is done to prevent the known complication of rupture.
Appendicular rupture
Occurs most frequently distal to the point of luminal obstruction along the antimesenteric border of appendix.
Rupture should be suspected in the presence of fever greater than 39°C (102°F) and a white blood cell count greater than 18,000/mm3.
Risk factors for perforation of appendix
Extremes of age (<5 and > 65yrs) -  Fecolith obstruction
Immunosuppression - Pelvic appendix
Diabetes mellitus - Previous abd. surgery
Common in extremes of age
Common in people with fecolith obstruction
Early antibiotics prevent rupture
Appendicectomy is done always in presence of rupture