Abstract: This study investigated the value of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) in evaluating the blood supply of the femoral head in patients with femoral neck fracture and its relationship with postoperative complications of femoral head necrosis. A retrospective study of 52 patients with femoral neck fractures was selected, and the patients were grouped according to whether they had femoral head necrosis within 12 months after surgery. Among them, 130 cases without femoral head necrosis were classified as non-necrosis group, and 22 cases with femoral head necrosis were classified as necrosis group. All patients underwent DCE-MRI before surgery, 5 days after surgery, and 3 months after surgery. The peak time of the same region of interest (ROI) in the upper outer and inner upper quadrant of the affected side in the necrosis group was higher than that in the non-necrosis group at 5 days and 3 months after operation (P<0.05). Increased age, preoperative traction, Garden classification type IV, and prolonged peak time of upper outer quadrant or upper inner quadrant 5 days after operation were independent risk factors for postoperative femoral head necrosis in patients with femoral neck fracture (P<0.05). Postoperative professional rehabilitation was a protective factor for patients with femoral head necrosis (P<0.05). DCE-MRI has a certain value in evaluating the occurrence of femoral head necrosis after surgery, and it has a guiding significance for early clinical diagnosis and timely intervention measures.

Key words: femoral neck fracture, dynamic contrast-enhanced magnetic resonance imaging, blood supply, femoral head necrosis