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A study on the evaluation of a risk score of osteonecrosis of the femoral head based on survival analysis

Journal of Arthroplasty Aug 17, 2020

Zheng J, Wang H, Gao Y, et al. - Via this study, researchers sought to develop a risk score that may aid in predicting the probability of developing an osteonecrosis of the femoral head (ONFH) in patients with femoral neck fracture within 3 years after closed reduction internal fixation. In addition, they evaluated the score for its performance, clinical utility, and internal validity. From March 2013 to January 2017, 378 newly injured femoral neck fracture patients treated with 3 partially threaded parallel cannulated screws in 3 hospitals in Shanghai were included in this retrospective follow-up study. ONFH developed in 83 of 378 patients within 3 years. The risk score was constructed in a form of nomogram including following predictors: Garden alignment index, time to surgery, preoperative displace, impaction, and postoperative malposition. Findings suggest that the risk score had satisfactory discrimination and calibration performance. It was established to have clinical utility with good internal validity. Differentiation of high-risk groups for post-traumatic ONFH could be performed using this score.

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