title: Prediction of rebound phenomenon after removal of hemiepiphyseal staples in patients with idiopathic genu valgum deformity.
abstract: OBJECTIVE
  Our aim was to investigate the predictive factors for the development of a rebound phenomenon after temporary hemiepiphysiodesis in children with genu valgum.
  
  
  METHODS
  We studied 37 limbs with idiopathic genu valgum who were treated with hemiepiphyseal stapling, and with more than six months remaining growth at removal of the staples. All children were followed until skeletal maturity or for more than two years after removal of the staples.
  
  
  RESULTS
  On multivariate logistic regression analysis, the rate of correction, body mass index (BMI), age, and initial valgus angle were significantly associated with a rebound phenomenon. With those characteristics, a predictive model for rebound was generated using recursive partitioning analysis. Children with a rapid rate of correction had the most frequent and severe rebound phenomenon (incidence 79%, mean 4°), whereas those with a slow rate of correction had less rebound when they had low BMI (43%, 2°) and none when the BMI was ≥ 21 kg/m(2).
  
  
  CONCLUSIONS
  This is the first study to evaluate a predictive model for a rebound phenomenon after temporary hemiepiphysiodesis in children with idiopathic genu valgum. Cite this article: Bone Joint J 2016;98-B:1270-5.
authors: Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, 88, Olympic-ro, 43-gil, Songpa-gu, Seoul 05505, South Korea.
authors: S-S
authors: SS
authors: Park
authors: Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, 88, Olympic-ro, 43-gil, Songpa-gu, Seoul 05505, South Korea.
authors: S
authors: S
authors: Kang
authors: Asan Medical Center Children's Hospital, University of Ulsan College of Medicine, 88, Olympic-ro, 43-gil, Songpa-gu, Seoul 05505, South Korea.
authors: J Y
authors: JY
authors: Kim
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D020878:Device Removal / Q000009:adverse effects*; D005500:Follow-Up Studies; D056304:Genu Valgum / Q000175:diagnosis / Q000601:surgery*; D006132:Growth Plate / Q000601:surgery*; D006801:Humans; D007719:Knee Joint / Q000002:abnormalities / Q000601:surgery; D016015:Logistic Models; D008297:Male; D015999:Multivariate Analysis; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012008:Recurrence; D018570:Risk Assessment; D012737:Sex Factors; D013528:Surgical Staplers; D017792:Surgical Stapling / Q000379:methods*; D016896:Treatment Outcome
keywords: Genu valgum; Guided growth; Hemiepiphysiodesis; Rate of correction; Rebound phenomenon; Stapling