Abstract: Objective　To investigate the effect of percutaneous compression plate(PCCP) combined with ascending branch of lateral femoral circumflex artery iliac flap in treatment on nonunion cases of femoral neck fractures in young adults.　Methods　From June 2013 to March 2016，8 young adults patients with nonunion cases of femoral neck fracture were treated by PCCP combined with ascending branch of lateral femoral circumflex artery iliac flap. Among the 8 patients, 7 were male and 1 was female, whose age ranged  from 19 to 42 yrs, with an average 26.5 yrs. For the fracture type, 1 case was Garden Ⅱ, 4 cases were Garden Ⅲ, 3 cases were Garden Ⅳ. Duration from first operation to the second was 7~15 months, averaging 9.2 months.　Results　All patients were followed up for 9 to 42 months, with a mean of 22.3 months. All fractures were healed, and the healing time was 3-9 months(4.6 months on average)．During the follow-up, the hips of 8 cases got good function, and the average Harris score was 91.7．Based on Matta evaluation,  7 cases were excellent in function，1 case was good ,the good rate being 100%.　Conclusion　PCCP covered by the iliac bone flap pedicled with the ascending branch is one of effective ways of treating nonunion cases of femoral neck fractures in young adults. It has advantages of lowing risk of complications, rigid fixation and early weight bearing．

Key words:  Femoral neck fractures, 　Bone nonunion, 　Percutaneous compression plate, 　Iliac flap