Patients
fracture, fractures, femoral neck fracture, trauma
SECONDARY, PATHOLOGICAL FRACTURE
This study enrolled femoral neck-fracture patients who underwent internal fixation with cannulated screws at Beijing Friendship Hospital (Level I trauma center in the region) from June 1st, 2021 to April 1st, 2022. Inclusion criteria: age > 18 years, close femoral neck fracture, and acute fracture (the time interval from injury to operation < 2 weeks). Exclusion criteria: pathological fracture, open fracture, old fracture, multiple fractures of the ipsilateral femur, secondary surgery, and patients who preferred other operations. Informed consent was obtained from all patients or their legal guardians.This was a randomized controlled single-blind trial. The patients enrolled were randomized into laser group and freehand group (Fig. 1). Randomization seed was specified, and the randomization sequence was generated using the PROC PLAN procedure of SAS 9.4 (SAS Institute, Cary, NC, USA) software with a 1:1 allocation. All operations were performed by two orthopedists who had received the same amount of time training and had completed more than 50 internal femoral neck fracture fixation by themselves in 2 years.