title: Clinical analysis of the rap stress stimulator applied for crus fracture after skeletal external fixation.
abstract: BACKGROUND
  Open crus fracture is still difficult in clinical treatment because of the delayed fracture union and high rate of nonunion after the operation. A consensus has been reached that mechanical stress can promote fracture healing. We independently developed a stress stimulator, which can provide longitudinal pressure for the fixed fracture end of the lower legs to promote fracture healing. The purpose of this study is to explore the advantages and clinical effect of the rap stress stimulator applied for open crus fracture after skeletal external fixation.
  
  
  METHODS
  One hundred and sixty-five patients (183 limbs) who suffered from open tibia and fibula fracture received skeletal external fixation, of which 108 limbs were treated with the rap stress stimulator after external fixation and 75 limbs were treated with regular functional exercises of muscle contraction and joint activity only. Then the fracture healing time and rate of nonunion were compared between the two groups.
  
  
  RESULTS
  The mean fracture healing time and rate of nonunion in the group treated with the rap stress stimulator were 138.27 ±4.45 days and 3.70% respectively, compared to 153.43 ±4.89 days and 10.67% in the group treated without the stimulator.
  
  
  CONCLUSIONS
  The rap stress stimulator significantly shortened the fracture healing time and reduced the rate of nonunion for treating open tibia and fibula fractures.
authors.affiliation: Department of Orthopaedics, the 175 Hospital of PLA, Orthopaedic Center of PLA, Southeast Hospital of Xiamen University, Zhangzhou, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Zhuang
authors.affiliation: Department of Orthopaedics, the 175 Hospital of PLA, Orthopaedic Center of PLA, Southeast Hospital of Xiamen University, Zhangzhou, China.
authors.forename: Jiayuan
authors.initials: J
authors.lastname: Hong
authors.affiliation: Department of Orthopaedics, the 175 Hospital of PLA, Orthopaedic Center of PLA, Southeast Hospital of Xiamen University, Zhangzhou, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.affiliation: Department of Orthopaedics, the 175 Hospital of PLA, Orthopaedic Center of PLA, Southeast Hospital of Xiamen University, Zhangzhou, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Orthopaedics, the 175 Hospital of PLA, Orthopaedic Center of PLA, Southeast Hospital of Xiamen University, Zhangzhou, China.
authors.forename: Zhenqi
authors.initials: Z
authors.lastname: Ding
keywords: fracture healing; open tibia and fibula fracture; stress stimulator