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1. Labor Mechanics and Dystocia Normal labor progression relies on the "Three Ps": Power (uterine contractions), Passenger (fetal size and presentation), and Passage (the maternal pelvis). Dystocia is an abnormal, slow progression of labor, broadly categorized into protraction (slower than normal) or arrest (complete cessation of progress) disorders. When labor stalls due to inadequate contractions, augmentation via amniotomy (rupturing the membranes) or intravenous oxytocin is used to stimulate progression. If the pelvis is inadequate or the fetus is severely malpositioned (e.g., breech or face pr ...