title: [Application of computer-aided design in preoperative planning in total hip replacement].
abstract: OBJECTIVE
  To investigate the advantages of using the preoperative computer-aided design system (CAD) in total hip replacement (THR).
  
  
  METHODS
  From March 2002 to September 2005, 182 patients who underwent primary THR were screened and divided into 2 groups randomly. CAD and traditional preoperative templating were used in preoperative planning respectively.
  
  
  RESULTS
  In group using CAD, the migration of the center of acetabulum was smaller, and the discrepancy of the limb length and the abductor force lever arm were fewer. All the differences above were significantly different.
  
  
  CONCLUSIONS
  CAD helps remove much of the guesswork during surgery, and the implant can be more precise fitting to the patient. And equal limb lengths and balanced abductor force can be restored more accurately.
authors.affiliation: Department of Orthopaedics, Eighty-eighth Hospital of People's Liberation Army, Beijing 100853, China. liuming1970@163.com
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
authors.forename: Pei-Jia
authors.initials: PJ
authors.lastname: Li
authors.forename: Yong-Zhong
authors.initials: YZ
authors.lastname: Luo
authors.forename: Han-Ping
authors.initials: HP
authors.lastname: Zhao
authors.forename: Qing-Xuan
authors.initials: QX
authors.lastname: Shi
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D025321:Surgery, Computer-Assisted