Correlation between an ABO Blood Group and Primary Femoral Head Necrosis: A Case–Control Study

Objective To investigate the relationship between primary femoral head necrosis (ONFH) and an ABO blood group. Methods This study was a retrospective case–control trial. An analysis of the clinical data of an ABO blood group with 516 patients (case group) with ONFH and 489 limb‐fracture patients (control group) without previous hip pain was obtained from the Second Hospital of Shanxi Medical University from November 2015 to November 2018. The...