Abstract: [Abstract] Objective：To investigate the clinical analysis of the proximal femoral nail in treatment of unstable femoral intertrochanteric fracture with elderly patients.Methods：The clinical data of 100 elderly patients with femoral intertrochanteric fracture were analyzed retrospectively.Patients were divided into two groups according to the different treatment methods.51 patients in the control group received the locking compression plate（LCP），and 49 patients in the observation group received the PFNA.Then the postoperative general conditions，hip function，complications，and quality of life scores were compared between the two groups.Results：The operative time，intraoperative blood loss，first walking time，hospital stay，and fracture healing time were significantly shorter in the observation group[（48.59±5.54）min，（96.58±3.55）ml，（6.54±1.55）d，（7.26±01.22）d，（11.23±2.44）w]than in the control group[（78.59±5.56）min，（117.89±3.58）ml，（10.59±1.54）d，（15.59±1.24）d，（13.59±2.47）w]（P<0.05）.The observation group had higher rate of the excellent（57.14%）and good（30.61%）as well as lower rate of the fair（10.20%）and poor（2.04%）than those of the control group（39.22%，27.45%，23.51%，9.80%，respectively）（P<0.05）.The hip function between the two groups had significant difference（P<0.05）； The incidence of complications in the observation group（2.04%）was significantly lower than that in the control group（P<0.05）.The scores of patients in the observation group were higher than those in the control group（P<0.05）.Conclusion：The application of the PFNA can significantly shorten the operation time，intraoperative blood loss，improve hip function and postoperative patient quality of life for elderly patients with femoral intertrochanteric fracture.

Key words: proximol femorol nail antirotation, instability, femoral intertrochanteric fracture, hip joint function