Abstract: Objective：Discusses the curative effect of application of modified SmithPeterson(SP) approach assist percutaneous cannulated screws treatment Pipkin Ⅰ type fractures.Methods：The clinical data(Duration of surgery,intraoperative bleeding,and length of hospital stay)from 10 cases of application of modified SmithPeterson(SP) approach assist percutaneous cannulated screws treatment Pipkin Ⅰ type fractures from May 2014September 2019were analyzed retrospectively,and the incidence of related complications was recorded,periodically review Xray and bone 3D CT to understand fracture healing,Followup records of the hip joint Harris score and ThompsonEpstein score to evaluate the efficacy.Results：The operation time was 70130min[(90.5±4.6)min] ,the intraoperative blood loss was 90210ml[(125.6±12.4) ml],and the hospitalization period was 1533d[(23.6±3.7) d].Intraoperative reduction and fixation were smooth,and all fractures reached anatomical reduction;All 10 patients were followed up after the operation.The followup time was 12～36 months[(23±2.1) months].No complications occurred,and all fractures were bony healing.The Harris score of hip joint 12 months after operation was(85.6±4.3),which was significantly improved compared with that before operation(27.3±3.4),and the difference was statistically significant(t=9.52,P<0.05).ThompsonEpstein clinical evaluation criteria at the last followup:7 cases were excellent,2 cases were good,1 case was fair,and the excellent and good rate was 90.0%.Conclusion：Application of modified SmithPeterson(SP) approach auxiliary percutaneous cannulated screws treatment Pipkin Ⅰ type fractures can fully expose and firmly fix the femoral head fracture with the vertical fracture line.It has good exposure effect,less trauma,less bleeding,short operation time,and helps early recovery of hip function after surgery.It is worthy of clinical application.

Key words: modified SmithPeterson approach, percutaneous assisted incision, cannulated screws, Pipkin type Ⅰ fracture