pelvic radiotherapy and intensity-modulated radiotherapy in adjuvant radiotherapy after cervical cancer surgery [7] . Oh, considered that the insufficiency fracture of sacrum and sacroiliac joint failure might be related to the dose of radiotherapy [8] . Anne Ramlov MD considered that PIF is common after treatment of LACC and is mainly seen in patients aged >50 years and not related to lymph node boosts but rather to dose and volume associated with irradiation of the elective pelvic target.

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... cing the prescribed elective dose from 50 to 45 Gy may reduce the risk of PIF considerably [9]. Many studies have shown that osteoporosis and postmenopausal status are important causes of insufficiency fracture, and osteoporosis is the most fundamental cause. Radiotherapy is an important inducing factor. On the basis of osteoporosis, it can aggravate the occurrence of insufficiency fracture. Blom lie reviewed 121 cases of sacral failure fracture reported in the literature, 60% of which were caused by local radiotherapy, but 95% of them occurred in elderly women after amenorrhea [10]. Mehmood