Predisposing factors # Grand multiparity # Overdistension of uterus as in twins and hydramnios # Ill maternal health # Caesarean section # Uterine prolapse # Retroversion after the uterus becomes pelvic organ # Uterine fibroid Aggravating factors * Retained products of conception * Uterine sepsis, endometritis
Subinvolution
Functional specialization 
Involution 
Sex selection
Seroconversion
Cancer selection
Clonal selection
Functional integration 