title: Postoperative improvement of femoroacetabular impingement after intertrochanteric flexion osteotomy for SCFE.
abstract: BACKGROUND
  Patients with slipped capital femoral epiphysis (SCFE) may develop cam-type femoroacetabular impingement (FAI). Early management of FAI has been advocated for patients with symptomatic FAI. The various treatment options, including reorientation surgeries, realignment procedures, and osteoplasty, remain controversial.
  
  
  OBJECTIVE
  We asked whether an intertrochanteric flexion osteotomy improved the clinical symptoms of FAI in patients with SCFE and confirmed whether the radiographic signs were compatible with the clinical signs of FAI.
  
  
  METHODS
  We retrospectively reviewed 32 symptomatic patients who underwent 32 intertrochanteric flexion osteotomies for severe SCFE. FAI was diagnosed clinically with a positive impingement sign. The osteotomies were designed preoperatively using CT. Cam-type FAI was evaluated with the modified α angle (β angle) on a Lauenstein view, measured between the proximal femoral shaft axis and the line from the center of the femoral head to the anterior point where the distance of the head center exceeded the femoral head radius. The minimum followup was 2 years (mean, 5 years; range, 2-9 years).
  
  
  RESULTS
  At last followup, only two patients complained of pain or inconvenience in daily life; the impingement sign was negative in 24 hips (75%). The β angles at last followup were reduced on average by 39°. The postoperative β angle was higher in hips with positive clinical signs of FAI than in those with negative signs.
  
  
  CONCLUSIONS
  Intertrochanteric flexion osteotomy for SCFE improved the clinical and radiographic signs of FAI. The β angle and clinical findings showed compatible improvement. We believe our intertrochanteric flexion osteotomy is a viable option for treating severe SCFE.
  
  
  METHODS
  Level IV, therapeutic study. See Instructions for Authors for a complete description of levels of evidence.
authors: Division of Orthopaedic Surgery, Chiba Children's Hospital, Chiba, Japan. h-saisu@dc4.so-net.ne.jp
authors: Takashi
authors: T
authors: Saisu
authors: Makoto
authors: M
authors: Kamegaya
authors: Yuko
authors: Y
authors: Segawa
authors: Jun
authors: J
authors: Kakizaki
authors: Kazuhisa
authors: K
authors: Takahashi
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D057925:Femoracetabular Impingement / Q000000981:diagnostic imaging / Q000209:etiology / Q000503:physiopathology / Q000601:surgery*; D005269:Femur / Q000601:surgery*; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D006801:Humans; D008297:Male; D010027:Osteotomy / Q000379:methods*; D020127:Recovery of Function; D012189:Retrospective Studies; D012720:Severity of Illness Index; D060048:Slipped Capital Femoral Epiphyses / Q000150:complications / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000601:surgery*; D013997:Time Factors; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
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