title: Remodelling of femoral head-neck junction in slipped capital femoral epiphysis: a multicentre study.
abstract: OBJECTIVE
  We examined the remodelling of the femoral head-neck junction in patients with slipped capital femoral epiphysis (SCFE) and the frequency of residual cam deformities.
  
  
  METHODS
  We reviewed 69 hips in 56 patients with stable SCFE who had undergone in situ pinning. Mean age at slip was 11.7 years and the follow-up period 63.4 months. Cam deformity was evaluated using the anterior offset alpha (α) angle and head-neck offset ratio (HNOR).
  
  
  RESULTS
  The average α angle and HNOR significantly improved from 76.2° to 51.3° and 0.086 to 0.135, respectively; 25 hips (36.2%) still had an α angle greater than 50°, and 32 hips (46.4%) had an HNOR of under 0.145. A multivariate analysis selected age at onset and slip angle as risk factors for cam deformity, with cutoff values 11.1 years and 21.0°, respectively.
  
  
  CONCLUSIONS
  Although most hips had remodelling of the head-neck junction, 29.4 % had residual cam deformities that may be susceptible to femoroacetabular impingement.
authors.forename: Mio
authors.initials: M
authors.lastname: Akiyama
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Nakashima
authors.forename: Toshio
authors.initials: T
authors.lastname: Kitano
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Nakamura
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Takamura
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Kohno
authors.forename: Takuaki
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Goro
authors.initials: G
authors.lastname: Motomura
authors.forename: Masanobu
authors.initials: M
authors.lastname: Ohishi
authors.forename: Satoshi
authors.initials: S
authors.lastname: Hamai
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Iwamoto
mesh_terms: D016022:Case-Control Studies; D002648:Child; D005260:Female; D057925:Femoracetabular Impingement / Q000453:epidemiology; D005270:Femur Head / Q000000981:diagnostic imaging / Q000601:surgery*; D005272:Femur Neck / Q000000981:diagnostic imaging / Q000601:surgery*; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000502:physiology / Q000601:surgery*; D006801:Humans; D007564:Japan; D008297:Male; D010027:Osteotomy / Q000379:methods*; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology; D012189:Retrospective Studies; D012307:Risk Factors; D060048:Slipped Capital Femoral Epiphyses / Q000601:surgery*; D016896:Treatment Outcome
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