Current research progress on pelvic insufficiency fractures after radiotherapy for pelvic neoplasms / 中华放射肿瘤学杂志

Pelvic insufficiency fractures ( PIF) is a vital complication after radiotherapy for pelvic neoplasms. It often leads to intractable pain and limited activity and is likely to be misdiagnosed as bone metastases and improperly treated. MRI is a common method for the diagnosis and differential diagnosis of PIF. The optimal approach to prevent PIF is to correctly identify the high-risk population and provide drug intervention when necessary. The low bone density state serves as a pivotal predictor at the beginning of radiotherapy. Reasonable selection of irradiation dose in pelvic lymphatic drainage area and minimizing the dose of pelvic bone probably reduce the incidence of PIF after radiotherapy.

The incidence and risk factors of pelvic insufficiency fracture in patients with cervical cancer after intensity-modulated radiotherapy / 中华放射医学与防护杂志

Objective To analyze the incidence and risk factors of pelvic insufficiency fractures (PIF) in patients with cervical cancer who received pelvic intensity-modulated radiotherapy.Methods This study a retrospective review of all patients was performed with cervical cancer who received pelvic intensity-modulated radiotherapy at our institution from November 2013 to December 2015,and the incidence and risk factors of insufficiency fractures were analyzed.Results Among the 104 patients,16 (with a total of 31 lesions) were diagnosed with pelvic insufficiency fracture.The occurrence rate of pelvic insufficiency was 15.4％.Ten patients (62.5％) had multiple fractures and five patients (31％) complained of pain.All patients' pain was relieved by rest or analgesic drugs.Insufficiency fractures were detected at a median of 6.5 months (range 1-16) from radiotherapy completion.The distribution of PIFs was followed:sacral had 16 cases (51.6％),sacroiliac joint had 7 cases (22.6％),iliac had 6 cases (19.4％),femoral head had 1 case (3.2％) and pubis had 1 case (3.2％).Univariate analysis and multiple analysis showed that postmenopausal status and low body weight (≤55 kg) were thought to be risk factors for PIF(P ＜ 0.05).Subgroup analysis also confirmed that postmenopausal status was a risk factor for PIF (P ＜ 0.05) in postoperative cervical cancer patients after pelvic intensity-modulated radiation therapy.Conclusions Cervical cancer patients with menopausal status and low body weight (≤55 kg) are at some risk for the development of PIF after pelvic intensity-modulated radiotherapy.