Background: Preterm premature rupture of membranes (PPROM) is a main cause of Preterm Labor (PTL) which is the most major cause of perinatal morbidity and mortality. Measurements of angle between cervix and uterus may play a role in prediction of PTL. Aim of the Work: To assess the accuracy of cervical length, posterior and anterior cervical angles to predict the latency in PPROM. Design: A cohort Prospective study on 150 patients with PPROM was done in 2 private hospitals in KSA. Methods : patients with PPROM had underwent a transvaginal ultrasound examination to measure cervical length (CxL), posterior and anterior uterocervical angle. Results: The latency period was within 2 days in 42 patients (28%) while was after 2 days in 108 patients (72%) of cases. The cervical length (CxL) cut-off value was 26.0 mm, while the sensitivity and specificity were (79.7% and 67.4% respectively), The Cut off value of posterior uterocervical angle (PCA) was 109.0˚ while the sensitivity and specificity were (94.0% and 62.3% respectively), The Cut off value of anterior uterocervical angle (ACA) was 107.0˚ while the sensitivity and specificity were (94.0% and 73.4% respectively). Conclusion: The combination of the length of Cervix (CxL), PCA and ACA values can predict the latency period in patients with PPROM