title: Hemiepiphysiodesis for Idiopathic Genu Valgum: Percutaneous Transphyseal Screw Versus Tension-band Plate.
abstract: BACKGROUND
  The aim of this study was to compare the outcomes of angular deformity correction by percutaneous hemiepiphysiodesis using transphyseal screw (PETS) or tension-band plating (TBP) in growing children with idiopathic genu valgum with emphasis on the rate of deformity correction.
  
  
  METHODS
  We retrospectively reviewed cases of hemiepiphysiodesis for angular deformity in lower extremities between 2009 and 2014. A total of 90 limbs in 33 patients received PETS and 60 limbs in 24 patients received TBP. Angular measurements were compared preoperatively and at the time of hardware removal. The amount and rate of angular deformity correction were compared between the 2 groups. Potential factors affecting correction velocity were investigated using multivariate analysis.
  
  
  RESULTS
  Angular correction was achieved in all patients. The mean rate of correction was more rapid with PETS than with TBP at both the distal femur (0.92 vs. 0.64 deg./mo, respectively; P<0.001) and proximal tibia (0.72 vs. 0.55 deg./mo, respectively; P=0.019). Multivariate analysis showed that the used implant significantly affected the rate of correction: PETS demonstrated faster correction velocity than TBP (-0.26, 95% confidence interval, -0.35 to -0.17, P<0.001).
  
  
  CONCLUSIONS
  Both PETS and TBP techniques result in satisfactory correction of coronal angular deformity in patients with idiopathic genu valgum. However, the observed rate of correction was faster with PETS than TBP. Correction with PETS, rather than TBP, may better serve patients near skeletal maturity.
  
  
  METHODS
  Level III-retrospective comparative series.
authors.affiliation: Department of Orthopaedic Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Gangnam-gu.
authors.forename: Hoon
authors.initials: H
authors.lastname: Park
authors.affiliation: Department of Orthopaedic Surgery, National Health Insurance Service Ilsan Hospital, Ilsandong-gu, Goyang, Korea.
authors.forename: Minjung
authors.initials: M
authors.lastname: Park
authors.affiliation: Department of Orthopaedic Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Gangnam-gu.
authors.forename: Sung Min
authors.initials: SM
authors.lastname: Kim
authors.affiliation: Division of Orthopaedic Surgery, Severance Children's Hospital, Yonsei University College of Medicine, Seodaemun-gu, Seoul.
authors.forename: Hyun Woo
authors.initials: HW
authors.lastname: Kim
authors.affiliation: Division of Orthopaedic Surgery, Severance Children's Hospital, Yonsei University College of Medicine, Seodaemun-gu, Seoul.
authors.forename: Dong Hoon
authors.initials: DH
authors.lastname: Lee
mesh_terms: D000293:Adolescent; D001860:Bone Plates; D001863:Bone Screws; D002648:Child; D005260:Female; D005269:Femur / Q000601:surgery*; D005500:Follow-Up Studies; D056304:Genu Valgum / Q000601:surgery*; D006801:Humans; D008297:Male; D012189:Retrospective Studies; D013977:Tibia / Q000601:surgery*; D016896:Treatment Outcome