title: [Ultrasound-aided biodegradable osteosynthesis system: application in fixation of oral and maxillofacial fractures].
abstract: OBJECTIVE
  To evaluate the effectiveness and complications of an ultrasound-aided biodegradable osteosynthesis system in the treatment of midfacial fractures.
  
  
  METHODS
  From January 1, 2010 to March 1, 2013, a total of 193 midfacial fractures patients were recruited. There were 120 males and 73 females. Among them, 93 patients were treated with SonicWeld Rx system (KLS Martin, Tuttlingen, Germany) while 100 patients FIXSORB MX (Takiron Co., Ltd, Osaka, Japan). The effectiveness, short-term and long-term complications were assessed by clinical examinations and computed tomography during an average follow-up period of 18 months.
  
  
  RESULTS
  All fractures healed well without dislocation, malunion, delayed union or nonunion. Pin insertion was completed with a total success rate of 99% in SonicWeld Rx group versus 98% in FIXSORB MX group. Three patients in SonicWeld Rx group and 2 in FIXSORB MX group developed postoperative local inflammation and healed with antibiotics therapy. Hardware visibility or palpability occurred in 3 and 8 patients in two groups respectively. One patient in SonicWeld Rx group and 4 in FIXSORB MX group experienced sterile abscess at Months 12-15 postoperatively and resolved by the removal of biodegradable materials. Two cases of implant looseness were observed in FIXSORB MX group. No other procedure-related complication was noted in either group.
  
  
  CONCLUSIONS
  The ultrasound-aided biodegradable osteosynthesis of SonicWeld Rx system is both effective and safe in the treatment of midfacial fractures. And its complication rate is equal to that of traditional biodegradable fixation.
authors.affiliation: Institute of Stomatology, General Hospital of Chinese PLA, Beijing, China.
authors.forename: You-bai
authors.initials: YB
authors.lastname: Chen
authors.forename: Hai-zhong
authors.initials: HZ
authors.lastname: Zhang
mesh_terms: D020341:Absorbable Implants; D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005151:Facial Injuries / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D005593:Fracture Fixation, Internal / Q000379:methods*; D006801:Humans; D016268:Internal Fixators; D008297:Male; D008875:Middle Aged; D010012:Osteogenesis; D012887:Skull Fractures / Q000000981:diagnostic imaging / Q000601:surgery*; D014465:Ultrasonics; D014463:Ultrasonography; D055815:Young Adult