title: [Intramedullary motorized nail for equalization of posttraumatic leg length discrepancies].
abstract: BACKGROUND
  Fractures in childhood may result in a significant leg length discrepancy (LLD). The common correction method of LLD and deformities is callotasis with external fixation. This is often associated with pain, pin site infection, muscle tethering and reduced range of movement (ROM).
  
  
  METHODS
  Between 2006 and 2008 a total of 11 cases of posttraumatic LLD (range 2.4-4.3 cm) were treated with a fully implanted motorized lengthening device (Fitbone®). Hospitalization time, leg equalization, rehabilitation time and complications compared to external fixation were recorded.
  
  
  RESULTS
  Leg lengthening was successfully performed in all cases, in five combined with angular and/or rotatory corrections. The mean distraction index was 1.03 mm/day (range 0.6-1.2 mm/day) and the mean consolidation index was 40 days/cm (range 25.2-50.9 days/cm). The average hospital stay was 9.8 days (range 8-20 days). Bone or soft tissue infections were not observed, nor were the complications commonly associated with external fixation. Functional results were excellent as the preoperative knee ROM was regained in all cases and with improved ROM in three cases.
  
  
  CONCLUSIONS
  The Fitbone® nail is a valuable alternative to conventional methods which reduces complications commonly associated with external fixation.
authors.affiliation: Kinderorthopädische Universitätsklinik, Universitätskinderspital beider Basel, Römergasse 8, CH-4005, Basel, Schweiz.
authors.forename: U
authors.initials: U
authors.lastname: Lenze
authors.forename: C C
authors.initials: CC
authors.lastname: Hasler
authors.forename: A H
authors.initials: AH
authors.lastname: Krieg
mesh_terms: D000328:Adult; D001858:Bone Nails; D019544:Equipment Failure Analysis; D005260:Female; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D006801:Humans; D007869:Leg Injuries / Q000150:complications* / Q000601:surgery*; D007870:Leg Length Inequality / Q000209:etiology* / Q000601:surgery*; D008297:Male; D011474:Prosthesis Design; D014143:Traction / Q000295:instrumentation* / Q000379:methods; D016896:Treatment Outcome; D055815:Young Adult