title: The shape and size of femoral components in revision total hip arthroplasty among Chinese patients.
abstract: OBJECTIVE
  39 sets of preoperative hip X-rays were studied to find out whether Chinese patients need revision femoral components with a different shape and size from western patients.
  
  
  METHODS
  From July 1998 to June 2001, the pre-revision X-rays of 39 revision total hip replacements among 38 Chinese patients (21 men and 17 women) were studied. The component size that produced the best distal canal-filling in the anteroposterior X-ray was determined by using templates of 200-mm femoral components used commonly for Caucasian patients.
  
  
  RESULTS
  The diameter of the component needed was 13.5 mm or less in 54% of cases, compared with only 17% for Caucasian patients as reported in the literature (p<0.01). When lateral templates of the corresponding size were put over the lateral X-rays, the anterior cortex of the 200-mm straight stem was shown to have thinned by 2.0 mm or more in 36% of hips; for 200-mm bowed stem, there was thinning of the anterior cortex by 2.0 mm or more in only 5% of hips (p<0.01).
  
  
  CONCLUSIONS
  Chinese patients are likely to need smaller femoral components than Caucasian patients, and may benefit from bowed-stem components in femoral revision.
authors.affiliation: Department of Orthopaedic Surgery, Queen Mary Hospital, Pokfulam, Hong Kong. pkychiu@netvigator.com
authors.forename: K Y
authors.initials: KY
authors.lastname: Chiu
authors.forename: T P
authors.initials: TP
authors.lastname: Ng
authors.forename: W M
authors.initials: WM
authors.lastname: Tang
authors.forename: H C
authors.initials: HC
authors.lastname: Cheng
authors.forename: T S L
authors.initials: TS
authors.lastname: Hung
authors.forename: P Y T
authors.initials: PY
authors.lastname: Tse
authors.forename: P S
authors.initials: PS
authors.lastname: Ko
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D044466:Asian People; D005260:Female; D005269:Femur / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation; D012189:Retrospective Studies