title: [Electromagnetic navigation interlocking intramedullary nail technology for treatment of femoral shaft fractures].
abstract: OBJECTIVE
  To explore the value of electromagnetic navigation interlocking intramedullary nail in the treatment of femoral shaft fracture.
  
  
  METHODS
  Between July 2012 and October 2013, 53 cases of femoral shaft fracture were treated. There were 40 males and 13 females, aged 16-52 years (mean, 38.3 years). The causes of injury were traffic accident in 28 cases, falling from height in 11 cases, falling in 7 cases, crush injury in 4 cases, and other in 3 cases. Of 53 cases, there were 3 cases of open fracture (Gustilo I degree) and 50 cases of closed fracture. Fracture was located in the proximal femur in 17 cases, middle femur in 29 cases, and distal femur in 7 cases. According to Winquist classification, 7 cases were rated as type I, 8 cases as type II, 22 cases as type III, and 16 cases as type IV; according to AO classification, 18 cases were rated as type 32-A, 28 cases as type 32-B, and 7 cases as type 32-C. The time from injury to operation was 3-11 days (mean, 5 days). Distal interlocking intramedullary nail was implanted using electromagnetic navigation.
  
  
  RESULTS
  The distal locking nail operation with interlocking intramedullary nail was successfully completed under electromagnetic navigation; the one-time success rate of distal locking nail operation reached 100%; and the locking nail time was 5.0-9.5 minutes (mean, 7.0 minutes). Healing of incision by first intention was obtained after operation, and no complication of skin necrosis, infection, and sinus tract occurred. Fifty-three cases were all followed up 5-12 months (mean, 9 months). One case had hip pain and weaken middle gluteal muscle strength, and the symptoms disappeared after removing the nail. During the follow-up period, no broken nails, nail exit, infection, or re-fracture occurred. All fractures achieved clinical healing, and the healing time was 8-22 weeks (mean, 14.5 weeks). In 49 patients followed up 8 months, the Lysholm score was excellent in 44 cases, good in 4 cases, and acceptable in 1 case, with an excellent and good rate of 98%.
  
  
  CONCLUSIONS
  Electromagnetic navigation system is safe and reliable, with the advantages of high positioning accuracy, short operation time, and no radiation, the clinical application of the system for distal locking nail operation can obtain excellent short-term effectiveness.
authors.affiliation: Department of Orthopaedics,  First Affiliated Hospital of Xinjiang Medical University, Urumqi Xinjiang, P.R. China.
authors.forename: Kangkang
authors.initials: K
authors.lastname: Zuo
authors.forename: Wei
authors.initials: W
authors.lastname: Qin
authors.forename: Qing
authors.initials: Q
authors.lastname: Guo
authors.lastname: Palati-Ababaikeli
authors.forename: Peiliu
authors.initials: P
authors.lastname: Qiao
authors.forename: Mingquan
authors.initials: M
authors.lastname: Shen
authors.forename: Lele
authors.initials: L
authors.lastname: Yin
authors.forename: Qilin
authors.initials: Q
authors.lastname: Pan
authors.forename: Xiaoxiong
authors.initials: X
authors.lastname: Xu
mesh_terms: D000063:Accidents, Traffic; D000293:Adolescent; D000328:Adult; D001858:Bone Nails; D055590:Electromagnetic Phenomena; D005260:Female; D005264:Femoral Fractures / Q000601:surgery*; D005594:Fracture Fixation, Intramedullary / Q000295:instrumentation / Q000379:methods*; D005596:Fractures, Closed; D005597:Fractures, Open; D006801:Humans; D016268:Internal Fixators; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength; D061646:Operative Time; D016896:Treatment Outcome; D014945:Wound Healing; D055815:Young Adult